Question about 2005 Chevrolet Cobalt

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2005 Cobalt air conditioning compressor will not engage. All fuses and relays OK. Wiring looks good. Any suggestions??

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  • lionel scott Jul 13, 2013

    no this was not helpful anyone can go to a shop i want to know if there is a low pressure switch thats shuts the compressor off and at what pressure this happens in other words a logical step by step procedure to locate proplem .

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  • 148 Answers

Have the a/c system checked for leaks and recharge the a/c system

Posted on Jun 19, 2009

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Air conditioning just stopped working checked fuse and relay do you have any idea what it may be thanks


What make model an year vehicle ? Well ,we can't say for sure would need to do some testing . You check fuse's ,ok that's easy , an you say you checked the relay .How did you do that ? There are videos on youtube on testing relay's an how to jump power right to the A/C compressor clutch coil .Do you know what a clutch coil is ? clutch not engaging 2005 Honda Odyssey Doesn't matter that this is a Honda ,all A/C systems work the same as far as clutch engagement . And there are a lot other videos as well .

Aug 26, 2016 | Cars & Trucks

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I have 2011 Nissan Sentra. Yesterday the a/c worked fine. Today it blows only hot air (compressor not engaging). I checked the freon, it's good. I'm lost.


If your fuses are all ok, there is a good chance the climate control unit has failed (the piece with all of the dials and buttons).

Jul 02, 2016 | Nissan Cars & Trucks

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My air condition work only when I hot wire the compressor clutch. Otherwise it not engaging when I turn on the ac.


You have to insert a can of R134A refrigerant and hose on the low pressure port.
Normally it is the fatter of the two hoses coming from the compre3ssor.It should then kick in with the A/C switch engaged.
If not you may have a bad fuse,switch,compressor,or relay.

May 08, 2014 | 2005 Dodge Stratus

1 Answer

Ac will blow warm air, the clutch does not engage. Could this be a compressor prob? Looked in the manual ...no trouble shooting ideas


Since you know that the clutch must engage in order for the compressor to operate, then there are most likely one of causes. The first is low or no freon in the system. The a/c system has a pressure sensor mounted in the low( return) side hose that prevents the clutch to engage if the freon is too low. The second would be the a/c fuse or relay faulty, preventing the clutch solenoid( a 12 volt electrically operated solenoid) from engaging. And the third would be that the clutch itself is bad because the solenoid wiring has broken. I suggest that first you locate the a/c clutch relay in the relay panel, remove the relay, carefully remove the plastic cover from the relay and reinstall the relay. The clutch should engage the compressor when you manually close the relay contact with your finger for one or two seconds. If the clutch does engage, your electrical circuit in ok and you are probably low on freon. A half of a can of r-134 in more that enough to operate the pressure switch. If it doesn't engage, check the a/c fuse or the clutch solenoid itself. Get back to me and let me know how things went. Dano

Jun 30, 2011 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

10 amp fuse blown, air compressor will not run.


whats the fuse for. if it operate the air conditioning system on the engine fuse box ur compressor clutch is burnt. if its the fuse inside the car it o\powers the hvac controls. put a new fuse on unplug ur compressor clutch connector and turn the engine on switch your air conditioning and heating controls on and off see if it blows the fuse again if it does then u have a problem with ur inside wiring circuit or heating ventilation air conditioning controls. good luck.

Feb 20, 2011 | 2005 Hyundai Sonata

2 Answers

The air conditioning in my 2005 T&C stopped working. Right before it stopped there was a "burnt" smell coming through the vents. What happened?


No air coming from air conditioning vents
  1. Check the air conditioner fuse and replace as necessary.
  2. Air conditioner system discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
  3. Air conditioner low pressure switch defective. Replace switch.
  4. Air conditioner fan resistor pack defective. Replace resistor pack.
  5. Loose connection, broken wiring or defective air conditioner relay in air conditioning electrical circuit. Repair wiring or replace relay as necessary. Air conditioner has a smell when used
    1. The air conditioner evaporator drain hose is blocked or partially restricted, allowing condensation to build up around the evaporator and drainage tray. Clear the drain hose where it exits the passenger compartment.
    2. Check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary.

Oct 10, 2010 | 2005 Chrysler Town & Country

1 Answer

How to dertermine why the air conditioning compressor is not working on my chevy cobalt - when i turn on the air i dont hear the compressor clutch engaging


Many newer cars have a low-freon sensor that prevents operation of the compressor if it is indeed low on freon. There is a relay, fuse, and the computer associated with the electrical operation as well. Have the freon level checked before looking for other causes. Hope this helps!

Aug 14, 2010 | 2006 Chevrolet Cobalt

2 Answers

AC Compressor not engaging on 2000 Chevy Impala. Fuses and AC relay okay. No power at compressor. Need wiring diagram. Also need to know if compressor requires 12v for operation. If not what should voltage...


When your R-134a runs too low it will NOT engage the compressor. You need to refill your a/c system before the clutch will engage, I also suggest finding the leak.

Apr 20, 2010 | 2000 Chevrolet Impala

1 Answer

Air condition don´t start, a honda civic


Air conditioning systems sometimes leak down and won't turn on when the refrigerant levels are too low.

Lift the hood and listen to the A/C compressor while someone inside the car turns it on.

Does the compressor engage for a second or two and then shut off?
If it does....you need to have your system checked for leaks and recharged.

If the compressor never comes on. Look at the A/C compressor relay. It should be under the hood in a little fuse box with other relays and fuses. When you find this relay you need to see if it works. You can buy a replacement relay and swap it or take it to a parts store and have it checked. Relays are 10-30 dollars and you should have three or four relays of the same type so a real cheap test is to swap a identical relay from an electric window or a defroster. You should see them sitting right next to the A/C relay if you have them.

Good luck and be careful!

Dec 11, 2009 | 2003 Honda Civic

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