2007 Chevrolet Cobalt Coupe Logo
Posted on Jul 18, 2012

Air conditioning start blowing out warm air and the engine light comes on. I have put coolant in it and a new sensor but it's still doing it. What else could it be?

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  • Posted on Aug 28, 2012
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Check your condenser fan and make sure it is working and make sure there is no restrictions in front of the condenser or radiator.

3 Related Answers

co7196

Ned C Cook

  • 3433 Answers
  • Posted on May 30, 2009

SOURCE: 1991 camaro rs overheating

Flushing the cooling system has its drawbacks. I you needed one freeze plug, you can reasonably suspect the others are surely right close to failure.In this case, starting to fail one at a rime weakest first. Now, as far as the other issues are concerned. What is the question? Sounds like the tazmanian devil had too much time on hand. I don't know the qualifications or integrity of your mechanic, but I do know a reputable, as well asa professional mechanic is not likely to intentionally or even bother to, contribute to these describe issues. Ocassional blue smoke is an internal problem, The AC is an issue in itself, The caalyctic converter is an issue that is too messy, smrlly thing to deal with. Any evisence of how and of what it was gutted? What was repaired or listed as repaired on your invoice? And what state are you in? It appears you may be seeking legal advice and in this forum it would not be an appropriate place to seek it. You may want to refer this to an Attorney for assistance.. Good luck and I hope you reach some resolve on this matter.

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Anonymous

  • 1 Answer
  • Posted on Aug 04, 2009

SOURCE: AC Blowing Warm Air

Leisalu,
I had the exact same problem as you described on my 02 Tahoe. I took it in for freon recharge at local mechanic shop, but didn't have mechanic check for leak. 2 months later same problem. I took it to Pep Boys and had them check for leak ($35) which they found in the clutch switch. They charged me $26 for the part plus $45 for the labor. Happy to report that the ac has worked fine since then.
Do yourself a favor and pay for them to check for leak BEFORE you waste your money on recharge.

2000 gmc

  • 56 Answers
  • Posted on Jan 03, 2010

SOURCE: Rear heater blows only cold air no matter what the

If this is equipped with a rear heater core it is probably plugged up and needs to be disassembled and cleaned out

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1helpful
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2005 jeep liberty blows cold air through the heater.

Either you are low on coolant and there is air in your heater core, or the thermostat isn't working properly, or your water pump is going out.
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Toyota Corrolla 1995. The heater does not work, I replaced the thermostat and have put a lot of antifreeze.

bleed cooling system, probably there is air trapped in the heater core preventing warm coolant to circulate into the heater core. try this
1 open radiator cap fill coolant and put heater in hi heat
2 start engine and wait until you see the coolant start to circulate
3 squeeze hose several times watching if coolant volume decrease
4 add more coolant and repeat 3 until coolant volume stays same or start overflowing.
5 check if heater giving off warm air or repeat 3 and 4 until warm air blows on heater.
--------------------------------------------------------------------
or find the coolant bleeder screw, do 1 and 2
open bleeder screw until coolant come out, do this several times until no air comes out when opening bleeder screw, fill coolant in radiator.
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On a cold start i have no high idle for warm up

coolant temp sensor and intake air temp sensor would be the next to check.intake air temp sensor is in the air intake tunnel between TB air air box. when running is there a DTC? by disconnecting the coolant temp sensor you put the ecm values at default try that if it corrects your issue replace it.(it will turn your check engine light on but you can clear later by disconnecting battery)
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1answer

2003 Nissan Altima Heater problem

car heaters work by recirculating the heat from the engine coolant, this problem sound to me like you have a faulty heater matrix, these are generally a pig to get to and even more of a pig to remove/replace & involves a lot of stripping out of the dash, if you really want to do it here are the instructions on how to do so......

Instructions
  1. Removal
    • 1

      Make sure the Nissan Altima's front wheels are in the straight-ahead position. With the ignition off, disconnect both battery cables, starting with the negative. Wait at least 10 minutes for the air bag's energy to deplete before continuing.

    • 2

      Detach the driver side air bag and steering wheel. Disconnect the air bag module connector and horn electrical connector from inside the wheel's lids. Use a T150 wrench to remove the bolts Store the air bag module face up.

    • 3

      Take out the passenger side air bag. Remove the glove box to reach the module connector.

    • 4

      Jack up the Nissan Altima and securely place it on jack stands. Place a clean container directly underneath the drain plug located on the bottom of the radiator on the passenger side. Carefully remove the drain plug and drain the engine coolant from the cooling system. Put the drain plug back in place and set the coolant aside.

    • 5

      Discharge air conditioner refrigerant. If your car used R-12 refrigerant, it's against the law for you to discharge or recharge the system unless you're an EPA-certified technician, so you may need a professional to do this part. Disconnect the heater hoses from the heater core tubes from within the engine compartment.

    • 6

      Remove the instrument panel from the car. Remove the lower panels first starting on the driver side. Removal includes all the screws and connectors, the audio/deck pocket, switch panel, center console, grilles, pillar garnish, instrument stay and steering member. You may need assistance taking the panel out.

    • 7

      Disconnect the air conditioning housing by taking off the refrigerant lines and thermo control amp. Remove the heater unit from the car and the heater core from the unit.

    Installation
    • 8

      Install the replacement heater core to the heater unit. Replace the heater unit and air conditioning housing within the car, reconnecting all the lines.

    • 9

      Reinstall the instrument panel, including the steering member, instrument stay assembly, pillar garnish, grilles, center console, switch panel and audio/deck pocket.

    • 10

      Reconnect the heater hoses to the tubes. Connect the steering wheel, both airbags and the glove box back onto the car.

    • 11

      Fill the cooling system. Use new coolant, if you're not certain the old liquid is still good. Recharge the air conditioning refrigerant (unless it requires an EPA-certified technician). Reconnect both battery cables, starting with the positive one.

    • 12

      Run the Altima's engine to its normal operating temperature. Check the climate control operation and inspect the system for leaks.


      If you do not want to go through this hassle you have two other options:


      Option 1 pay for a mechanic to do all of the above.

      Or

      Option 2 buy yourself a 12v plug in ceramic heater or two, one you could keep on the dash for screen clearing duties & another you could keep near or on the center console for body warming duties!, best of luck & i hope this helps.



0helpful
1answer

Why has my air conditioning stopped blowing cold air , engine light come on and coolant readout (in the driver info. center)a stopped showing any numbers

If your check engine light is on you usually have a code. Where I live several auto part stores will read the code for free. It would help to have a code.
If you have 2 fans on the radiator one should come on when you turn the A/C on. The other fan come on when engine reaches engine operating temperature. You have relay for compressor and the fan motor. Does the inside fan stop blowing. If a fuse was blown they should not work at all but a relay could drop out and in. I have found a bad relay over the years by checking the temperature of the relays, it is not always the case.. I have had a couple relays which were a lot hotter than the others, helped identify the bad relay. you can get the relay checked at the auto parts store. The low pressure switch could be creating problems with low Freon pressure. some info fuse relay below.
http://www.autogenius.info/chevrolet-cobalt-2005-2010-fuse-box-diagram/
0helpful
2answers

Air Conditioning only works during winter and heat only works during summer!

Miss Kristin, your situation sounds more like the air flow blend doors/flaps under dash are operating, but incorrectly. All these vehicles temperature changes are actuated by vacuum from the running engine. In your case it's possible a vacuum line has become disconnected from the blend switch behind the lever or the 2 heat and a/c hoses have become switched. Either way, I believe it must be in the vacuum lines under dash, or possibly no vacuum at all to the blend switch because the main hose from the engine has become disconnected or is broken. Best of luck on this luv.
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I have a 1993 Chevy S-10 4.3L automatic. The heat won't shut off. It pours out regardless of the position of the climate controls. Coolant level and condition good. AC would work but. Thanks.

#46-12-03: AIR CONDITIONER BLOWS WARM AIR (REPLACE A/C DELAY RELAY) - (Apr 7, 1994) 999999995.gif REVISION: 04/14/94
THIS BULLETIN IS BEING REVISED TO CORRECT THE TRANSMISSION LISTED IN THE MODELS. ----------------------------------------------------------------------
SUBJECT: AIR CONDITIONER BLOWS WARM AIR (REPLACE A/C DELAY RELAY)
MODELS: 1994 CHEVROLET AND GMC TRUCK S/T PICKUP WITH 4.3 ENGINE (VIN Z - RPO LB4), 4L60E TRANSMISSION (M30) AND AIR CONDITIONER/MANUAL CONTROLS (C60); OR 4.3 ENGINE (VIN W - RPO L35) AND A/C (C60)
BUILT BEFORE THE FOLLOWING VIN BREAKPOINTS:
PLANT DIVISION VIN LINDEN GMC RK501034 SHREVEPORT GMC R8501199 SHREVEPORT CHEVROLET R8105893 LINDEN CHEVROLET RK103097
CONDITION:
SOME OWNERS MAY EXPERIENCE A CONDITION WHERE THE AIR CONDITIONER IS TURNED ON AND DELIVERS ONLY WARM AIR.
CAUSE:
THE AIR CONDITIONER COMPRESSOR MAY DELAY LONGER THAN THE "ORIGINAL DESIGN" INTENDED 12 SECONDS, OR MAY NOT ENGAGE, DUE TO THE POSSIBLE MALFUNCTION OF THE COMPRESSOR DELAY RELAY.
CORRECTION:
TRUCKS BUILT BEFORE THE VIN BREAKPOINTS LISTED ABOVE MAY NEED A NEW AIR CONDITIONER DELAY RELAY. REPLACE ONLY WITH 15990540 AIR CONDITIONER COMPRESSOR DELAY RELAY. SPECIFIED PROCEDURE IN SERVICE MANUAL NATP 9429, PAGE 1B-59. TEST AIR CONDITIONER OPERATION FOR DELIVERY OF COOL AIR.
NOTE:TO TEST FOR PROPER OPERATION, PUT THE A/C CONTROL ON THE "OFF" POSITION, START THE ENGINE, THEN PLACE THE A/C CONTROL IN THE "ON" POSITION. THIS SEQUENCE WILL PROVIDE IMMEDIATE ENGAGEMENT OF THE AIR CONDITIONER COMPRESSOR. WHEN THE ENGINE IS STARTED WITH THE A/C CONTROL ALREADY "ON", THERE WILL BE A NORMAL 15.0 SECOND DELAY FOR THE AIR CONDITIONER TO ENGAGE.
SERVICE PARTS INFORMATION:
P/N DESCRIPTION QTY
15990540 A/C COMPRESSOR DELAY RELAY 1
PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.
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Hello i have a 2000 toyota 4runner limited 4x4 . i live in maine and when i start the truck up in the morning to go to work, after the truck warms up it puts out nice heat. but after i drive it for 10...

bleed cooling system.run engine with red cap off till up to temp.replace cap before turning off engine.might have to add more coolant while running.
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