Why is my Mercedes-Benz heater fan not turning on?
The last one should have around +6V; the exact voltage will vary depending on the fan switch setting. If any of these are wrong, check for connection problems. If the control voltage never appears, the regulator will never turn on the fan. This control voltage is coming from the climate control unit on the dash.
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.
What should I know about my Mercedes 300D?
Good compression is paramount on a diesel engine. These cars use vacuum extensively. The vacuum lines become old and brittle with age and can cause all sorts of gremlins from door locks to engine shut off. Fortunately the vacuum system is (relatively) easy to diagnose and repair.
Is it bad to replace vacuum line on Mercedes 300D?
The vacuum lines become old and brittle with age and can cause all sorts of gremlins from door locks to engine shut off. Fortunately the vacuum system is (relatively) easy to diagnose and repair. Vacuum lines, elbows and T’s are easy to replace. Even if the vacuum pump is worn out, it’s not a bad repair.
The last one should have around +6V; the exact voltage will vary depending on the fan switch setting. If any of these are wrong, check for connection problems. If the control voltage never appears, the regulator will never turn on the fan. This control voltage is coming from the climate control unit on the dash.
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.
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 to do if your heater motor won’t work?
Options for repairing it yourself and saving big $$$. If your heater motor won’t come on, first check your fuse or relay. If you are not sure if the switches are the problem, we recommend you get the covers off and power the motor directly with a 12 volt power source.
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.
What causes a heater fan to stop working?
What else would stop working if the OVP is bad or what else causes the heater fan to not work. 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.
What should the voltage be on a Mercedes blower fan?
Follow them to a terminal block located on the firewall near the power brake vacuum booster. One should be ground/earth. One should have +12V. The last one should have around +6V; the exact voltage will vary depending on the fan switch setting. If any of these are wrong, check for connection problems.
Why does my Mercedes air conditioner not reset?
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. The component is in charge of the air path that goes into the cabin. Check the onboard computer if it can verify the damper’s position.
How to troubleshoot your Mercedes medic air conditioner?
Turn the A/C ON. If you have an Economy button make sure that is off. Make sure fan is on HIGH, temperature selector is turned all the way to COLD, and that the A/C and recirculate light indicators are on. Set the temperature to cold, the lowest setting. Set the cooling fans on high on the climate control.
Follow them to a terminal block located on the firewall near the power brake vacuum booster. One should be ground/earth. One should have +12V. The last one should have around +6V; the exact voltage will vary depending on the fan switch setting. If any of these are wrong, check for connection problems.
How does Mercedes Benz air conditioner system work?
While the pictures on this article are of Mercedes Benz cars, this guide is written to apply to all makes and models. How the A/C System Works. A/C compressor not engaging.
Turn the A/C ON. If you have an Economy button make sure that is off. Make sure fan is on HIGH, temperature selector is turned all the way to COLD, and that the A/C and recirculate light indicators are on. Set the temperature to cold, the lowest setting. Set the cooling fans on high on the climate control.
While the pictures on this article are of Mercedes Benz cars, this guide is written to apply to all makes and models. How the A/C System Works. A/C compressor not engaging.
Why is my air conditioner fan not working?
If you are getting air movement at hwy speed but no fan at idle I would suspect that the speed controller is likely faulty. In my estimation, pounding on something out of frustration usually does more harm than good. Its not a vending machine! Here are images of the strip fuse.
Why is my fan speed controller not working?
Mine just failed a few days ago, cracked in half fm fatigue. The fan speed controller is hooked up to the speed sensor in your speedometer. If you are getting air movement at hwy speed but no fan at idle I would suspect that the speed controller is likely faulty.
Why is my gas compressor not working on my Mercedes 190?
If your car has an overload relay, and the fuse is bad or the contacts are dirty, the compressor may not work as it should. If you find that the gas has leaked out of your system, and you need a recharge, ask the shop to recharge the system and add their special yellow/green dye.
Why are the control lights on my Mercedes not working?
The fuse was not there. ( since corrected ) still nothing. All the control lights work on dash 1994 220
What does it mean when your radiator fan is not working?
This is what we call a blown fuse. A blown fuse is no big deal, and changing one does not cost a lot of money. If your car’s radiator fan is non-functional, check your car’s user manual and locate the fuse for the radiator fan controller or the fan.
Why does my air conditioner spin when the engine is running?
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. If the clutch is engaging and disengaging rapidly, the refrigerant may be low. Locate the Low Pressure A/C recharge port.
What to do if your Mercedes climate control is not working?
When the control is switched off and on, heating resumes. This could be a Mercedes climate control problem. Replacing the push button assembly or climate control module may help in this situation. Then check the auxiliary water pump to see that it is running and if the heater valve clicks when energized.
Why is my Mercedes air conditioner not working?
Your Mercedes vehicle will flash a host of service lights to inform you when something might be damaged inside the car. If the air conditioner unit is not running normally or is only blowing out warm air, it may be a temporary fault. Sometimes the unit isn’t actually damaged, and resetting your climate control unit
When the control is switched off and on, heating resumes. This could be a Mercedes climate control problem. Replacing the push button assembly or climate control module may help in this situation. Then check the auxiliary water pump to see that it is running and if the heater valve clicks when energized.