Question about 1999 Chevrolet Suburban

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Ac compressor won't engage

Blows warm air the compressor will not engage

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The ac compressor has a safety switch built in it to keep it from coming on if the liquid level of freon is low this keeps the compressor from overheating and going out all together. try hooking up a can of R134a and turn the can upside down so that the liquid flows in and the compressor should kick in with almost one full can.

Posted on May 11, 2009

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  • Expert
  • 187 Answers

Check the fuse in the fuse box first.

Posted on May 11, 2009

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SOURCE: heater blows cold air ac blows warm air

Your problem is the air temp control blend door actuator is defective and not controlling temp u set. to change/access this part the dash assembly must be removed from the car.

Posted on Mar 24, 2009

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SOURCE: ac not blowing cold air.

Sounds like the compressor has failed.

Posted on Apr 19, 2009

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SOURCE: ac is blowing warm air in my 2005 sierra 2500hd duramax. Any idea

Your system has R-134 Freon in it. the 134 is made up of smaller molecules than the old R-12. The R -134 permeates through the rubber parts of the system. If the system gets too low on Freon, the compressor will stop coming on.(low pressure cut out switch). Have the system serviced with an A.C. machine that can vacuum, measure the amount of Freon in the system, and add the right amount. The machine can also inject die. Later the die will show up under a black light.This will show any leaks you may have.

Posted on May 23, 2009

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SOURCE: 99 VW Beetle blows warm air when you start air conditioner

your condensor fins could be blocked by leaves or other debris on the outside. this component is located right behind the radiator. there could also be an overcharge or under charge in the system. make sure that when you charged the system that you used a good set of gauges to check the system pressures. Also check and make sure that there is not a blockage somewhere in the lines, Usually if there is there is a fine layer of ice surrounding it.

Posted on Jun 25, 2009

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SOURCE: AC blowing warm air

When they refilled the refrigerant did they put die in it to check for leaks, it sounds like there may be a leak.

Posted on Jul 24, 2009

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I suggest you few help links.Click the link below and follow the troubleshooting.
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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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2 Answers

Ac blows warm


was it regassed when you changed the compressor? a/c units can be quite difficult, they have certain pressures inside and the valves will not engage the compressor if its not gassed right. on the pipe running from the condensor to the compressor you should see an outlet/inlet valve, you can use your key or a small screwdriver to depress a valve in it to see if its got pressure, just give it a quick push to see if pressure comes out so you dont reverse the valve inside the system and pop the rubber seal. good way to indicate if theres gas and pressure. its like your tyre if your releasing air out of it if this helps.

Jun 21, 2010 | 2006 Dodge Ram 2500

1 Answer

My 2002 Expedition air conditioner will sometimes blow hot air and others cold air


I would check the following possibilities:
1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.

2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.

Could be other issues, but I would start with these.

Good luck

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1 Answer

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Hi,
With engine running, I would check to see if the compressor clutch is engaging when the AC is turned on. If not, I would first have the freon level checked. If after checking, it is fully charged but not engaging, I would then suspect an AC relay switch.
I hope this helps... Good luck!

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