Why is my air conditioning not working on my GMC Sierra?

While there are a variety of reasons your GMC Sierra 1500 air conditioning won’t work, the most common 3 are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor.

Why is the a / C on my 1992 Chevy not working?

Have a competent A/C tech check your freon charge, my money is on it being low. Re: 1992 AC Problems-Blinking A/C and not working.. A/C blinks and won’t work. If the battery is disconnected it will work again but it will go into the not working mode sooner or later.

Why is my AC not working in my car?

System (control head) is picking up electrical interference on the wire that comes from the “pressure cycling switch” (there is two of them) to the control head that makes it think compressor is cycling because of a low charge.

Is the GMC Sierra a / C compressor clutch not engaging?

I have an 01 gmc… I have an 01 gmc sierra with 5.3. The A/C compressor clutch is not engaging. I have checked all the fuses the light on the button comes on but it does not even try to start. What direction do I go first?

Why does my GMC P / you compressor not turn on?

No. Theres a schrader valve to prevent freon from escaping when you replace the switch. Just make sure you dont overtighten it. This is on a 2004 gmc p/u I have checked the fuse and relay all good. I have jumped high pressure switch .I have no power going to the high pressure switch wiring is good.

What was the a / C problem on my 1998 Silverado?

One day last year, I started my 1998 C-1500 350 2WD, and surprise – the a/c blew hot air. I said a bad word. I only use the truck to go to the lumber yard, so I just let it be – until today, when it was 98F and I got stuck in a 10-mile traffic jam (I said many bad words).

How much refrigerant is in a GMC pickup?

GMC Light Truck refrigerant and oil capacity charts Year Model Refrigerant Refrigerant Oil All Engines w/ Front AC Only R134a 29.00 7.50 1999-2001 All Engines R134a 31.00 8.50 1998 All Engines R134a 32.00 8.00 FULLSIZE PICKUP

Why is my C-1500 AC not working?

If it’s low enough, the compressor will not even kick in. Just a thought before you start tearing things apart. Thanks. I only have an old R-12 gauge set, so I can’t actually test the refrigerant level.

Why is my GMC c1500 air conditioner blowing hot air?

When the air conditioner in your 1995 GMC C1500 starts blowing hot air, you likely have a freon leak. Recharging the freon in your AC system is an inexpensive and easy first step to restoring the cooling capacity of your A/C system.

How to add refrigerant to a GMC c1500?

Recharging the freon in your AC system is an inexpensive and easy first step to restoring the cooling capacity of your A/C system. Most refrigerants include a leak sealer that will seal small leaks in addition to filling the R134a refrigerant. The A/C system in your C1500 consists of a compressor that is belt-driven, an evaporator and freon.

Why is my air conditioner not blowing cold air?

A defective relay, compressor clutch coil or damaged compressor are all possibilities. The air conditioning system is equipped with safety switches that automatically turn the compressor off when the A/C refrigerant level becomes low.

Why is my car AC not working after recharge?

There could be numerous reasons for the improper AC working after you recharge it. You can handle the situation by finding out the most common reasons for this right away! 1. The Compressor is Unable to Connect Numerous reasons can cause the compressor to not to connect with the vehicle AC.

Is the a / C not getting cold in a GMC Truck?

Also truck is a 2003 silverado 5.3L im actualy having the exact same problem, mine has plenty freon but still when it blows its not cold. its not hot but not cold maby blowing 75 degrees? idk but i know it sucks. Yes it does!

Why does my Chevy A / C condenser keep leaking?

GM went with a condesor that is allegedly defective because it allows air to enter the system. Water vapor in that air will freeze and, as a December 2017 class-action lawsuit describes, cause backups that lead to excessive internal pressure.

Why is my AC not blowing cold air?

The chemical Freon or simply you can call it coolant is the reason why the AC cools hot air quickly. The chemical can run out if there is any leakage in the AC. Thus, AC would not work, as there is no Freon in the system.

Why does my air conditioner stop working in the morning?

We added a can of freon, tightened the Schrader valve, etc. When it is cold in the morning it works fine. When it heats up during the day it will run for a while and then the compressor kicks off. If I turn off the A/C in the truck for about 3-5 minutes it will work again for a while when I turn it back on.

What to do if your car AC is not working?

You can handle this situation by using the best maintenance tips. Use a charging machine that will pour coolant and make your AC work properly. If the AC still doesn’t work even after using the charging machine, contact the nearest mechanic.

What to do when your GMC Sierra stops running?

If you have fuel pressure after the above tests pull a spark plug and check for spark. If you don’t have spark check the cam position sensor in the distributor. If you have spark with no pressure it is the pump.

What to do if your air conditioner is not working?

Replacement of most air conditioning components requires complete evacuation of the air conditioning system with a refrigerant recovery machine. Once components are re-installed, the technician will remove all air from the system in preparation for recharging the system with new refrigerant.

Why is my blower not working on my Chevy Silverado?

Another common problem will be the blower motor will stick in the ON position and never shut off. You can access the resistor module behind the fuse box located on the driver’s side lower dash compartment. You must visually inspect the resistor, and make sure it isn’t melted or burnt. If it is, then replace it.

What should I do if my Chevy Blazer is not getting heat?

If you are not getting heat and the engine IS reaching operating temp then check the heater core by touching both heater hoses; they should both be hot. If one is hot and the other is cooler, then the core is plugged up.

Where is the heater located on a Chevy Blazer?

The cabin heater in your vehicle produces heat from a heater core. The heater core is a small radiator, located under the dashboard of the vehicle and consists of conductive aluminium or brass tubing with cooling fins to increase surface area. Hot coolant passing through the heater core gives off heat before returning to the engine cooling circuit.

Is the O2 sensor heater on my Silverado Sierra?

Recently purchased a 2001 Silverado in private sale. The previous owner had recently replaced fuel pump and had an exhaust leak fixed (included all maintenance records with sale). I went to get it tested at emissions (Arizona) but they would not test it as apparently the ECU was cleared and not all tests (O2 sensor heater) had rerun.

What are common reasons my GMC Jimmy heater is not working?

What are common reasons my GMC Jimmy has heater problems? While there are a variety of reasons your GMC Jimmy heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor. See what others are asking about their GMC Jimmy.

What happens when the blower fails on a Chevy Equinox?

When the blower motor fails, the air conditioner and heater may still work, and heat or cool may be felt at the vents, but the air pressure will be dramatically decreased. This Read More When the heater control valve fails, adjusting the temperature may not change the air temperature at the vents, whether hot or cold.

What happens when the thermostat on a GM 4.3L fails?

When the thermostat, in your GM 4.3L, 5.0L or 5.7L pick up, SUV, or van fails, it does one of two things: it stays stuck open or stuck closed. If it stays stuck closed, your pick up (van or SUV) will overheat.

Where does the air come from in a GMC Sierra?

This 2005 GMC Sierra came in with the complaint that the air will only flow from the defroster vents, regardless of where it is commanded to. This Sierra has auto a/c controls and no floor mounted center console.

Why is my a / C not working on my Chevy Silverado?

If it didn’t work or stayed on all the time then there is a problem. Subject: Air Conditioning (A/C) Blows Warm Air Intermittently. This condition may be caused by the A/C compressor clutch cycling out early when the low pressure side reaches approximately 380 kPa (55 psi).

Why are the vents on my GMC Sierra stuck?

The most common symptom of course is lack of control over the vent output position and normally it will be stuck in the defroster only position. If it is not currently stuck in the defroster position but you are changing the actuator anyways. make sure that you set the vent position to defrost before starting this procedure. You will see why later.

What to do if your GM fan won’t defrost?

See if this fixes the problem. Many of GM’s AC control heads have a built in reset feature that when power is removed and then applied it will go through a cycle that activates all the vent doors and mode doors. It’s worth a try.

What kind of refrigerant does a 2000 Chevy Silverado use?

Note: a U.S. built 2000 model year truck uses R134a refrigerant, not Freon (R12). OK, you’re on the right track. If the system is fully charged (pressure correct), but the A/C compressor clutch does not engage, the fault is electrical.

What can I do about my air conditioner in my truck?

You don’t have to be a technician to monitor your pickup truck ‘s air conditioning system. There are several things you can do to help keep your truck’s A/C out of the repair shop. Drive Belt: A drive belt makes your truck’s air conditioning compressor turn, which keeps the cooling refrigerant circulating through the system.

What kind of air conditioner does a Chevy Silverado have?

I have a 1996 Chevy Silverado. The compressor is good and the pressure switches are new. They A/C works if I connect a hot wire to it but it constantly kills my battery.

What happens when one part of the AC system fails?

When one part of the system fails to operate like the air conditioner then one part of the system stops working in this case the cold air. The AC system has four basic parts: A compressor, which is powered by the engine using a serpentine belt.

Is there a recall on the GM air conditioner?

While GM has reportedly recalled all of its previous faulty inventory stock of the affected parts, no vehicle recall has been issued for those drivers stuck with failing GM air conditioning.

What to do if your air conditioner clutch does not engage?

If the clutch doesn’t engage, the air conditioning compressor can’t pump refrigerant. So start your diagnosis by determining if the compressor clutch works. Turn the air conditioning controls to MAX AC and start the engine. Then look at the front of the compressor clutch.

Where are the vents on my GMC Sierra?

No output on dash face vents or defrost vents but floor works ok. I have tried the pulling the fuses both under hood and left of dash but that did not fix my problem.

What kind of HVAC does a Chevy Silverado have?

Access our free HVAC Systems Repair Guide for Avalanche, Sierra, Silverado, C&K Series, 1999-2005 through AutoZone Rewards. These diagrams include: Fig. A/C Compressor Controls (c) (2005) Fig. Air Temperature Actuators Left and Right (c) (2005) Fig. Power, Ground, Serial Data and Blower Motor Control (c) (2005) Fig.

Why is there no air coming out of the vents?

This should cause the control head to go through a sync mode with all the output devices (mode, recirc, etc.). It’s a long shot, but sometimes those control heads go out of sync for no obvious reason.

Why is my GMC Yukon not cooling down?

2015 GMC Yukon Models Owners of GMC, Cadillac and Chevy trucks whose AC systems are no longer cooling and have taken their vehicles to a mechanic or dealership have all been told the same thing—there is a cracked refrigerant hose leaking Freon from the compressor to the condenser.

Why does my Chevy Tahoe stop blowing cold air?

As it turns out, the AC system in Escalade, Silverado, Sierra, Yukon, Suburban, and Tahoe trucks stops working and ceases blowing cold air because of a defective bracket design affecting the A/C compressor and condenser line.

What happens if the compressor breaks in a GMC Truck?

Worse yet, if hose in GMC, Chevy and Cadillac trucks cracks and is not able to transport Freon from the compressor to the condenser, both the condenser and compressor may break, too. Pictured: an ideal repair of the cracked compressor to condenser line with installed bracket

What happens when air conditioner fails in Acura MDX?

When the blower motor fails, the air conditioner and heater may still work, and heat or cool may be felt at the vents, but the air pressure will be dramatically decreased. This Read More

What to do if defrost on GMC Truck is not working?

1. Remove the floor air outlet duct extension (1) from the floor duct (2). 2. Remove the Body Control Module. 5. Disconnect the electrical connection from the mode actuator (10). 6. Remove the mode actuator mounting screws from the HVAC module. 7. Remove the mode actuator as an assembly with the actuator cam. 1.

Why does my GMC Sierra 1500 not turn on?

Air blows out the vents for about 20 mins, then it starts blowing out slower and soon it is blowing out in the ducts, but not coming out anywhere, (vents, defrost or the feet ) . Won’t switch from,cold to hot, stays on air conditioner all the time, won’t switch to heat, replaced the blend door actuator and it still does it.

What’s the problem with dual heat control in a Chevy Silverado?

I have dual heat control for driver and passenger. Problem is my side blows heat all the time regardless of setting. You can turn the temperature on both to coolest setting. You reach across and feel the air coming from the vent on the passenger side its cool. The drivers side is screaming hot.

Where is the climate control on a Chevy Silverado?

I’ve replaced the blower motor (passenger side underneath dash), resistor (behind the glove compartment), and checked ALL fuses left of driver and under the hood, and still the blower motor does not run. A/C comes on but no air from any of the vents on any settings, heat, a/c, defrost, floor, vents, or combination.

Why is my a / C not working on my Chevy Tahoe?

This DTC is for an Evaporator Air Temperature Sensor, which is NOT used on the models listed above. The reduced air flow from the HVAC vents is due to the evaporator core freezing up. These issues may be caused by the HVAC control head not being programmed AFTER being replaced (as instructed in SI).

What does DTC b3933 stand for in Chevy Tahoe?

I was troubleshooting my 08 Silverado. DTC B3933, AC evaporator temp sensor short to battery or open. I ordered the sensor which only showed up on one dealers parts list. All the exploded parts views didn’t show the part. Mose dealers didn’t list it.

What is Bulletin 09-01-03-004 for GM?

GM has issued a technical service bulletin #09-01-38-004: INFORMATION FOR VEHICLES WITH HVAC CONTROL MODULE A/C AND RECIRCULATION INDICATORS FLASHING. The bulletin applies to the following vehicles: on some vehicles, you have to have the fan on in order to turn the ac on

Why is the air conditioner in my car not cooling?

The most common causes of broken air conditioning are leaks or compressor issues. If your air is blowing cool but not cold, the problem could be a clogged filter, cooling fan problem, radiator trouble, or it could simply be that you need to recharge your AC.

Why is my air conditioner not engaging the clutch?

If an air conditioning system is so low on refrigerant that it can’t engage the compressor clutch, it’s really too low to be recharged with a DIY kit. The leak is large and should be repaired, because there’s probably air and moisture in the system. Moisture reacts with the refrigerant and oil to cause acid and sludge that can destroy the system.

Why does my air conditioner not work in my car?

The lawsuit claims the vehicles have a serious defect that causes the air conditioning systems to crack and leak refrigerant, lose pressure, and fail to function properly to provide cooled air into the vehicles.

Who is the lead plaintiff in the GMC air conditioner class action?

On April 11, 2018, U.S. District Court Judge Matthew F. Leitman issued an order appointing Lieff Cabraser partner Annika K. Martin as Co-Lead Plaintiffs’ Counsel in the multidistrict product defect litigation.

Why do I have problems with my GMC climate control?

This could be caused by a leak in one or more of the a/c components and an a/c leak machine will be required to locate the leak. If the line stays cold, it could mean a defective actuator on the heater box. The actuator controls the heating and cooling operations and a defective one could cause the problem being faced.

What are the most common problems with a GMC Sierra?

Another 258 people reported the second-biggest issue where heating and air conditioning temperature and air delivery mode door actuators may fail. If one or more delivery mode door actuators fail, the HVAC system may not produce correct temperatures or air delivery. The HVAC system stores fault codes, which help with diagnosis.

Why does my GMC A / C heater jump from hot to cold?

This is an electrical component in the GMC climate control system that controls the hot/cold functions of the heater and the a/c heater box. If it loses its internal setting it can jump from hot to cold on its own or even go to heating when cooling is set. If this is the cause the actuator will need to be replaced.

What kind of refrigerant does a GMC Sierra 1500 use?

Recharging the freon in your AC system is an inexpensive and easy first step to restoring the cooling capacity of your A/C system. Most refrigerants include a leak sealer that will seal small leaks in addition to filling the R134a refrigerant. The A/C system in your Sierra 1500 consists of a compressor that is belt-driven, an evaporator and freon.

Why is my GMC Sierra 1500 blowing hot air?

When the air conditioner in your 2003 GMC Sierra 1500 starts blowing hot air, you likely have a freon leak. Recharging the freon in your AC system is an inexpensive and easy first step to restoring the cooling capacity of your A/C system.

How to replace AC compressor belt 01-06 GMC Sierra?

1A Auto shows you how to repair, install, fix, change or replace a broken, cracked snapped, or cut AC compressor belt on a 2002 GMC Sierra. This belt is correct for many GM vehicles but the application is the same for Chevrolet Silverado and GMC Sierra trucks, years 99, 00, 01, 02, 03, 04, 05, 06, and 07. Hey friends!

Where is the heated seat button on a GMC Sierra?

The button used to control the passenger’s heated seat is located on the passenger’s door panel. To heat the entire seat, press the horizontal button. Press the button to cycle through the temperature settings of high, medium, and low. The indicator light will glow to indicate the level of heat selected.

What are the issues with a GMC Sierra 1500?

It made me realize some small preferences for the next vehicle, such as: having crew cab with four doors instead of the extended cab. The main issues encountered were: antilock brakes, window motor failure, signal lights always blown, and easily broken center console.

Where was the 2004 GMC Sierra 1500 last serviced?

Mileage: 125,596 miles Body Type: Pickup Engine: 8 Cyl 5.3 L Accident reported. Purchased on 09/01/04 and owned in NE until 05/27/21. Driven an estimated 3,753 miles/year. Last serviced at 59,557 miles in Omaha, NE on 07/25/19 • Vehicle serviced • Oil and filter changed.

What to do if your a / C compressor won’t turn on?

Have someone watching the A/C compressor while you start the truck and turn the A/C on. If the compressor cycles on, turn it off. You now just narrowed it down to either low refrigerant or a bad pressure switch. Keep it Professional Grade. Use Genuine GM Parts Cut your fingernails. That’s not me. And spell your name right.

Why is my air conditioner clutch not working?

If your Air Conditioning compressor isn’t working (the clutch won’t engage) then watch this video. The A/C switch on the dash switches the compressor on, with one exception. If the PCM (powertrain control module) senses low pressure in the low pressure fluid line, it will stop the compressor clutch from engaging to prevent any damage.

Subject: Air Conditioning (A/C) Blows Warm Air Intermittently. This condition may be caused by the A/C compressor clutch cycling out early when the low pressure side reaches approximately 380 kPa (55 psi). The fix is to bring the vehicle to the dealer to have the latest software installed into the vehicle.

What kind of climate control does a GMC Sierra have?

I have a 2004 GMC Sierra with dual climate control heating and AC. On occasions when I turn on the AC the passenger side 2004 GMC: AC..passenger side..the drivers side blows extremely hot air…

What’s the problem with my 2004 GMC Sierra 1500?

No one has added a helpful site for this 2004 Sierra 1500 problem yet. Be the first! Read reviews of repair shops in your area. Enter your zip code: For some unkown reason my heater in my truck will only work on high (NUMBER 5) position and no other position.

Why does my GMC Sierra 1500 turn into a heater?

Spoke with a friend that has the same truck he said his and his dads truck did the same thing. This definitely needs to be looked into because it seems to be a very common problem. When I turn on the AC, it works but sometimes the pilot’s side turns into a heater without any reason; the co-pilot’s side is fine.

Why is my AC not working on my GMC Sierra 1500?

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 GMC Sierra 1500 has air conditioning problems?

What to do if your GM air conditioner fails?

If you own one of the affected 2014-2017 model GM vehicles listed below and have experienced A/C failure or are concerned about imminent air conditioning failure in your SUV or truck, we urge you to contact us immediately using the form below to discuss your potential product defect case.

Why is my a / C not working on my Dodge Silverado?

The dual-zone electronic control seems to be working properly. The serpentine belt doesn’t seem loose. The compressor pully is still turning (I had a Dodge that quit and froze up making an awful noise as the belt shreaded).

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