Why is my Mercedes Benz blower motor not working?

If there no power is found, the blower motor resister is the culprit and needs to be replaced. As a note, 85 percent of the time when the blower motor does not come on or operates at one speed only, the blower motor resister is at fault. The resister emits substantial heat from the resistance it supplies and eventually burns up.

Where is the resister on a Mercedes Benz fan?

Just to the left of the blower motor, an electrical connector connected to a flat 1-inch-by-2-inch plate can be seen. This is the blower motor resister, which controls the fan speeds. Disconnect the multi-wire connector from the blower motor resister next to the blower motor. Start the car and turn the air conditioning on.

What happens to the blower motor when the car is off?

Ot just an AMG badge on the trunk lid. Checked the air recirculate switch – marked “rest” on the console – it was off. With the car off, I pressed it in so the light lit – the blower fan stopped for a few seconds, then started up at a higher speed.

What causes the a / C blower to run uncontrolled?

Mostly (according to this forum) a failed BR causes the a/c blower to run uncontrolled. Btw your WIS a/c circuit diagram is not identical to mine for W208. However the blower motor/regulator part is the same. Still the Regulator?

How does a Mercedes Benz blower motor work?

That is the design. The blower motor (A32m1) is powered from circuit 30, which is the unswitched battery voltage, via fuse f25 (30A). I second the above posts.

What happens when the blower motor does not come on?

As a note, 85 percent of the time when the blower motor does not come on or operates at one speed only, the blower motor resister is at fault. The resister emits substantial heat from the resistance it supplies and eventually burns up. The resister is inexpensive as parts go and is simple to replace.

Where is the blower motor on a Honda Accord?

Locate the blower motor. The motor can be seen hanging down close to the passenger kick panel. Just to the left of the blower motor, an electrical connector connected to a flat 1-inch-by-2-inch plate can be seen. This is the blower motor resister, which controls the fan speeds.

Where are the fuse relays on a Mercedes ML 250?

A fuse and relay box is located in the engine bay on the passenger side. To access this panel, open the hood and look on the left side of the engine. You will see the fuse box, right behind the headlight. Remove the fuse cover by pressing on the locking tabs. Here you will find fuses F201 to F241.

How long does it take to replace a Mercedes blower motor?

There is a motor and relay below the motor that many folks replace at the same time, since both are known to fail. One form member even has an excellent write up about the replacement, including pics. Very helpful! It’s about a 2-3 hour job, less if you’ve done one before. Thanks guys, I’ll look again. Must have missed it first time round

Is the fuse on the blower motor okay?

The blower motor fuse is fine (the one on the driver side shock tower, right?). This blower motor problem has been discussed quite a few times, and you should be able to find solutions by searching these discussions. Look in the “stickies” at the top of the forum, DIY repairs. :nerd

Why does my Mercedes Benz blower stop working?

Im from Malaysia… i just want to ask why my blower stop working after i charge the gas in the system. like it suddenly stop. is it because its a burden to the blower? and..the compressor didnt stop eventhough i released all the gas. maybe there’s problem at the controller. but whats the reason this happen? sorry my english kinda suck. Hi.

What to do if your blower motor stops working?

Personally, I replaced mine when it stopped working and that solved the problem. There is a motor and relay below the motor that many folks replace at the same time, since both are known to fail. One form member even has an excellent write up about the replacement, including pics.

What to do if your Mercedes W123 is bouncing?

Engine having a hard time shutting off? Make sure to check and or replace your injector pump shut off valve. Overload protection relays are located in different places on different chassis, so check for the location of yours and follow these instructions. Car bouncing down the road?

Why is my climate control not working on my Mercedes?

When I got the car, the climate control didn’t work. You could hear that the heater valve was working and that the compressor fan was kicking on with AC buttons, but no air would blow out of the vents.

Why does my air conditioner blower make a whining sound?

The blower motor and resistor move the air through the HVAC system. If you are starting to hear a whining sound when the motor is running or the motor doesn’t run at all there is a good chance that the motor is going bad.

What should I do if my blower fan wont come on?

You will need to test with a voltmeter and see if your fan motor is getting the required 110 to 125 volts AC out of your control board to start the motor. I would suggest setting your thermostat to the “Fan ON” position. You should be getting 120 volts out of the control board.

How can I check if my blower motor is working?

You can also check for power to the blower. If you pull the drivers side front window plastic the output from the ccu is pretty accessible. If you checked the external spots then I would pull the blower and inspect that. not hard to get to the blowerunit.

Why is my furnace or AC blower not working?

Furnace or AC Blower Motor Not Starting or Working! Top 10 Reasons Why! – YouTube If playback doesn’t begin shortly, try restarting your device.

What are the symptoms of a bad blower motor relay?

3. Melted relay. Another more serious symptom of a problem with the blower motor relay is a burned or melted relay. Relays are exposed to high current loads and can sometimes get hot when they develop problems.

Can a blower motor run when the car is off?

I searched the forum, followed the advice of others and replaced the motor control attached to the side of the blower, pulled the blower itself and cleaned the brushes (they we not too warn, so I didn’t replace) but the problem continues.

Is the Mercedes SLK heater motor not working?

R171 2005 SLK with severe water ingress which has damaged heater blower motor and speed controller.Was this helpful? Buy me a coffee.. https://Ko-fi.com/aut… R171 2005 SLK with severe water ingress which has damaged heater blower motor and speed controller.Was this helpful? Buy me a coffee.. https://Ko-fi.com/aut…

Where is the regulator on a Mercedes fan blower?

The Mercedes Benz fan blower motor regulator is a series of resisters in a printed circuit board about 2-inches square located right next to the blower motor.

Why does my Mercedes-Benz A / C blower run uncontrolled?

But under fault conditions it could fail as ‘always on’ or ‘never on’. Mostly (according to this forum) a failed BR causes the a/c blower to run uncontrolled. Btw your WIS a/c circuit diagram is not identical to mine for W208. However the blower motor/regulator part is the same.

If you have this signal, and no blower speed power output, the blower motor final stage unit is faulty. For more detail on the signal the final stage unit receives, see the next step. If you do not have this signal, the HVAC control panel may be faulty.

Why is my Mercedes-Benz E320 AC not working?

Learn if it’s a simple fix or time to seek out a trusted technician. Not your vehicle? Why Isn’t My A/C Working? What are common reasons my Mercedes-Benz E320 has air conditioning problems?

Why is my ML320 blowing hot air even when the AC is on cold?

Is your ML blowing hot air even though you have the AC on cold setting? A common problem with the ML320 / ML430 is the AC getting stuck on Hot or Cold setting. This is caused by the blend motor flap getting stuck and no longer moving when you rotate the AC knob between Hot and Cold.

Why is my AC blowing only hot air?

The air coming in may be cold, your AC setting is on cold but you get only hot air from the vents. The following video will show you how to check the operation of the A/C air blend heater flap. You can also manually switch the stuck flap to COLD settings if you need a temporary solution.

How many volts does a Mercedes Benz blower need?

The signal that controls blower speed, sent from the HVAC control head is the green wire with blue tracer. With a DVOM backprobing (red arrow) that terminal and the negative lead of the DVOM on battery negative, you should have about 10 volts.

How to tell if blower motor is failing?

If you suspect your final stage is failing, look for the following symptoms: Blower motor speed fluctuates from high to low. Blower motor does not turn ON. Blower motor only runs at one speed. Over time, a blower motor may become noisy as the motor electrical contacts wear.

How to troubleshoot your Mercedes Benz air conditioner?

Identify the location of your compressor. Look at the pullyer and you should be able to see if it spining or not. The engine running turn the A/C on max cool, set fans high, and make sure that the clutch is engaging on the compressor. The pulley spins any time the engine is running. The center part of the A/C pulley only engages when the A/C is on.

Where are the fuses on a Mercedes Benz blower?

Working at the left corner of the dashboard, open the fuse panel door. Check fuse #25 30 amp, fuse #41 15 amp and fuse #30 30 amp for continuity. Use the fuse sheet supplied with your vehicle (yellow arrow) to confirm fuse location and assignment. The paper should be stuffed into a compartment in the side of your fuse panel.

What should the battery voltage be on a Mercedes Benz blower?

Next, the white with red tracer (blue arrow) wire should be battery negative (0.1 volts). Then the green with blue tracer (green arrow) wire will be about 10 volts with blower from low to high speed. The signal that controls blower speed, sent from the HVAC control head is the green wire with blue tracer.

How much does it cost to replace blower motor on Mercedes E320?

A malfunctioning HVAC blower motor regulator can cause the blower motor to operate below the requested speed or not at all. Updated regulators are available; the blower motor and cover need to be replaced at the same time to upgrade the system. The average cost for a Mercedes-Benz E320 Blower Motor Replacement is between $727 -$748.

Why is my Mercedes-Benz E320 heater not working?

Learn if it’s a simple fix or time to seek out a trusted technician. Not your vehicle? Why Isn’t My Heater Working? What are common reasons my Mercedes-Benz E320 has heater problems?

Why does my 95 e320 wagon have a burnt smell?

Installed new blower fan and now getting burnt smell out from vents. Blower motor working fine don’t see what’s causing this issue. 95 e320 wagon. The fan in the dashboard will not go up nor down so the motor runs at one speed only. It will not allow me to control the force of the fan, it is just constant.

Why is my HVAC blower motor not working?

How do you turn off the COMAND in a Mercedes?

The radio will turn off. Once you close the door wait a couple of seconds and then by touching the door handle the car will lock. You can unlock the car remote, get in and by pressing the “on” button on the Comand the radio will turn on, without the key being in the car or close to it. Once you are in and you close the door the radio remains on.

What to do if your Mercedes Benz fan is stuck?

Not hard to do, just drop the blower motor and replace the regulator. The hardest part is positioning your self under the dash and looking upwards to locate the mounting screws. Hi Paul, just wondering if you found a solution to your stuck fan.

Why does my blower run when the car is turned off?

When full of debris/leaves/twigs/etc from over the years, it backs up and oddly enough, diverts drain water (rain, carwash, etc) just above the passenger footwell…which happens to coincide with where the blower resistor/regulator is located. Hence, water + electric component more often than not = failure. Click to expand…

Why does my car blower motor not shut off?

If you have a vehicle with climate control system and a variable speed blower motor and the blower motor won’t shut off and stays on HIGH with the car turned off and the key out, chances are the blower motor motor control processor is toast or the HVAC control module is damaged.

How can I stop the Mercedes blower motor?

Otherwise you will need to remove the panel under the passenger side dash and access the regulator and disconnect it. Unfortunately there are no fuses that can be removed to stop the blower motor. Marty, Mercedes Technician Category: Mercedes Satisfied Customers:57,126 Experience: Bosch Certified Master Tech. Over 35 years experience. Verified

Why does my Mercedes E320 fan not shut off?

Mercedes-Benz E320 The fan motor wont shut off when ignition… The fan motor won’t shut… The fan motor won’t shut off when ignition is turned off Show More Show Less Ask Your Own Mercedes Question Share this conversation Answered in 2 minutes by: 10/14/2011 Mercedes Mechanic: Marty, Mercedes Technician replied 9 years ago

What to do if your climate controlled blower wont shut off?

If your climate controlled blower processor is shot, be prepared to spend mucho bucks for a replacement. But before you start throwing expensive parts at the problem, you’ll have to do some checking. Start by testing the gray/black wire at the blower motor control processor. First, try grounding the wire. Then try removing it.

What happens if you lose the blower motor relay?

The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Without it, the AC system will not be able to circulate any heated or cooled air. The blower motor relay controls the current used to power the blower motor,…

What happens if you have a bad blower motor?

Where is the Mercedes heater blower located in the car?

Check first before just pulling it out Rooty. Once you remove the trim under the dashboard/footwell area, it is located up underneath/rear of the glovebox. I bought a new one when mine died. £88 delivered from Merc dealer inc VAT.

Where is the fan regulator on a Mercedes Benz?

These sensors even sense when the window is down or the door is open and increase the fan speed as necessary to maintain a constant temperature within the car. Remove the passenger side, lower dash cover under the glove compartment that conceals the blower motor. A 1/4-inch socket will be needed to remove the screws holding the cover.

What to do if your Mercedes heater is not working?

you can take the fan motor out, easily, its 3 screws and visible if you pull the left hand vent (next to the door) out… grip by top and bottom edge NOT the vents themselves. beside the main unit, under the central console, are the actuator solenoids for air control.

What happens when catalytic converter is clogged in Mercedes?

If your catalytic converter is clogged you will notice a drastic drop in fuel efficiency and real struggle getting your Mercedes to accelerate. If the cat is completely clogged your car won’t even start.

What causes a bad or failing blower motor relay?

Blown fuses. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current…

When does my AC blower motor come on?

When it does come on, usually after about 20 minutes of drive time, it blows great. At times it will come on as soon as I crank engine, at times it will not come on at all.

What to do if your Mercedes heater blower is not working?

My blower motor was fixed in with 3 posidrive screws. Had to use a stubby screwdriver on one of them too due to a serious lack of room. Check first before just pulling it out Rooty.

Why is my Mercedes R170 central locking not working?

Often if you listen carefully at the latch section on the door edge while the pump is running, any hissing is a sure indication that the pipe connector has broken inside the door and will need attention. To gain access to the door lock actuator and its yellow pipework you will have to remove the door card.

What causes a Mercedes Benz key to not turn?

List of common problems and possible solutions 1 Locked Steering Wheel. New drivers always experience this at least once, so we thought we would include it in this list. 2 Discharged Battery Undervoltage. 3 Key Tumbler Defective. 4 Defective Electronic Ignition/Switch System EIS / N73. 5 Smart Key Remote. …

What to do if your Mercedes key won’t turn?

If you have this problem you will have to install a new / virgin EIS. You can not install a used unit because the EIS has to be paired / married to the car using Mercedes-Benz Star Diagnostic Software. They key itself may be the reason why the car doesn’t start. The key may open the doors, but it will not start the car.

Why is the battery on my Mercedes Benz not working?

Hint: Starter Problem or Low Battery This may seem obvious, but an old battery is the root of many headaches and can cause all sorts of malfunctions on Mercedes-Benz cars. How old is the battery on your Mercedes-Benz?

What should I do if my Mercedes Benz won’t start?

Start the car and you should be able to get around 60 psi. When the engine is running and when you turn off the engine the pressure should stay steady. Always perform this test on a cold engine. Next, make sure that the fuel injector connections are secure and not loose. Check the fuel pump and the fuel pump relay.

Why does my Mercedes 560sl have trouble starting?

A 1988 Mercedes 560SL has trouble starting despite efforts to crank the engine. Could the fuel filter or pump be responsible for this? Check the fuel pumps to see if they are working alright.

What kind of engine does the Mercedes 560sl have?

Questions about Mercedes 560SL Issues on JustAnswer The Mercedes 560SL is part of the popular 107 SL line of sporty coupes and convertibles that came out from 1971 to 1989. It was fitted with an overhead camshaft 5.6-liter V8 engine that used Bosch fuel injection and produced 238 horsepower and 287 foot-pounds of torque.

What are the problems with a 1987 Mercedes 560sl?

The fan blower that is connected to the heating and air conditioning has stopped working on a 1987 Mercedes 560SL model 107. Also windshield wipers don’t work. What can be done? It’s possible that the fuses may have blown causing this to happen.

What causes a Mercedes 560sl steering wheel to pop?

There are a few reasons why this could happen. One of the common reasons is if the sub frame mounts on the front chassis have worn out. This will make the front sub frame pop when the wheel turns. Other reasons could be a steering tie rod end, control arm bushings or a steering coupling at the steering box that have worn out.

Where does the Mercedes-Benz 560sl rank in the HVR?

In fact, the 560SL is currently ranked 1201st in the HVR with only 27 points—and that’s actually taking a step in the right direction. Last time around, the 560SL had 18 points and sat in 1245th place, just 12 spots from dead last.

Is the Mercedes-Benz 560sl the official car of Antarctica?

But when it comes to ice cold—and we’re talking Polar Vortex cold— well, if the 1986–89 Mercedes-Benz 560SL was any more chill it would be the official car of Antarctica. Until recently, that is. According to the Hagerty Vehicle Rating, the 560SL had been free-falling for nearly two full years before the bleeding finally stopped.

What causes a fuse to blow on a blower motor?

If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.

What to do if your truck stop blower doesn’t blow?

Replace the connector and add a extra ground from the blower motor. Also you can have a dirt plugged evaporator. Remove the blower motor and vacuum out the evaporator coils. Then use a garden hose and towel to spray it clean with scrubbing bubbles. Also check the rec door operation.

Why does my Gasser blower blow so much?

On a 90’s gasser 1/2 ton I used to own the door motor control rod would veroften get blown/shaken off of the door rod,there are several door servos on these trucks to direct airflow.When the door gets caught 1/2 way the flow volume is greatly reduced.

What to do if your blower motor melts down?

Look around and above the blower motor area for a connector with two heavy wires in it. You know the melted one? 1995’s are famous for this connector meltdown and my 1993 doesn’t look so good. Replace the connector and add a extra ground from the blower motor. Also you can have a dirt plugged evaporator.

Why is my blower motor only working at high speed?

The first thing that needs to be determined is the type of noise that is present and the possible sources. Rattling or knocking noises while… The blower motor only working on high speed is a common symptom of a failing blower motor resistor; but the fact the radio stopped working at the same time is unusual.

What causes a blower fan to not work?

When this happens, you may notice that you will not feel anything blowing out of the vents at all. This may also cause the blower motor to work intermittently. A blower fan is connected to the negative battery terminal (also called ground) on one end and to the positive battery terminal through a blower motor resistor on the other end.

Why is the resistor not working on my blower?

Hi There, The resistor is what controls the speed of the blower motor, not the relay. The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all.

Where is the blower motor on a Mercedes?

Look at where the wiring comes out of the top of the box where the blower motor is located. They come out on the left/driver’s side. Follow them to a terminal block located on the firewall near the power brake vacuum booster. One should be ground/earth.

Why is my heater blower fan not working?

Assuming all your fuses are good, either the blower motor is toast or the blower motor regulator has gone. There is a nice R/R link for the blower motor in the DIY section. The regulator lives under the blower motor. Your OVP has no play in the blower motor operation. Click to expand… Can anyone direct me to links for more information?

Why is my Mercedes Benz heater not working?

Its too cold now to use the car without heat. Assuming all your fuses are good, either the blower motor is toast or the blower motor regulator has gone. There is a nice R/R link for the blower motor in the DIY section. The regulator lives under the blower motor. Your OVP has no play in the blower motor operation.

Where does the wiring come out of a blower motor?

Why does my Mercedes E320 AC not reset?

For example, if you want to know about Mercedes E320 AC reset, it is better to check the manual and follow the manufacturer’s recommendations. If a Mercedes air condition reset does not work, these following reasons could be causing the trouble: When the AC is releasing hot air, the possible reason could be a defect in the damper.

Why does my Mercedes air conditioner keep blowing hot air?

In many models, the AC keeps blowing hot air even after recharging the coolant. It is a frustrating problem, especially during the summer, when it is almost impossible to drive a car without the AC on. A Mercedes air conditioning reset is a possible solution. Do you know how to do it? Is there any other way to fix the glitch?

Learn if it’s a simple fix or time to seek out a trusted technician. Not your vehicle? Why Isn’t My A/C Working? What are common reasons my Mercedes-Benz E320 has air conditioning problems?

When did the Mercedes E Class W124 come out?

Year of production: 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996 Blower motor (auto. A/C) Blower regulator (auto. A/C) WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

What to do if heater blower won’t run?

If you have a 108, 109, 114 or 115 chassis you will have to remove the center console and dash to get to the motor. If you have a 107, 116, 123 or 126 Chassis access to the motor is quick. For the 201 and 124 chassis it takes a little more work as you have to remove the wiper and intake air vent assembly.

What kind of heater does a Mercedes 124 have?

For all Mercedes 124 chassis cars from 1986 up to 1993 ONLY. This includes the 260E, 300E, 300D, 300CE, 300TE, and 400E Fits all Mercedes 126 chassis cars from 1981 to 1991. This includes the 300SD, 380SE, 380SEL, 500SE, 500SEL, 300SDL, 420SEL, 560SEL, 300SE, 300SEL, 380SEC, 500SEC, 560SEC.

Why does my blower motor not turn on?

Blower motor does not turn ON. Blower motor only runs at one speed. Over time, a blower motor may become noisy as the motor electrical contacts wear. I have also seen debris from a rodent get trapped in the blower cage creating a vibration or noise. If your blower is noisy, pull it down and see if there is something stuck in it.

Why is my C230 Komp heater not working?

C230 Komp blower has been off and on since last year, and only working on 5 when it did. Worked fine over summer. Now that it is cold, it stopped for the most part. Read the threads here….pulled cover off from under passenger foot well and access the blower motor and wiring. Wiggled wires and checked connections and that did the trick.

What to do if your Mercedes AC unit is not working?

However, there might not be any damage in the AC unit when it is blowing warm air or not running properly. It could be a temporary fault and a reset is likely to be enough to restore the normal function. Sometimes, the process is called a Mercedes climate control reset. The reset procedure is similar no matter whatever you call it.

The Resistor Blocks tend to overheat and burn out resistors or the thermal fuse…. BUT when airflow reduces…. ALWAYS REPLACE the pollen filter…. moisture increases and the internal connectors on the resistors rust… clean them and resolder….. this is what normally causes intermittent operation.

What are the signs of a bad heater motor?

Common signs include the car’s heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor. 1. Blower motor stuck on one speed 2. Blower motor does not work on certain settings 3. No air from the vehicle’s vents Average rating from 130,908 customers who received a Vehicle Engine Cooling Inspection.

What to do if your AC blower is not working?

Disconnect cables to motor and resistor. Remove hose from motor, it should just pull off with little effort. Unscrew motor and resistor. Screw new motor and resistor in. Connect hose to motor. Connect cables to motor and resistor. Turn on car and test AC. Thanks for watching! Loading…

Why is my heater blower motor resistor not working?

This occurs due to the failed blower motor resistor not being able to control the flow of electric current, it could be that the resistor is somehow bypassed and the power is directly being fed from the switch. Excessive current can overheat and permanently damage the blower motor resistor

Where is the motor for the heater blower located?

The motor that turns the blower is called the blower motor. It is located in the dashboard, usually on the opposite side of the steering wheel or inside the engine compartment on the firewall. The blower speed can be adjusted in almost every modern car.

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