Question about 2003 Pontiac Grand Prix

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Ac works only on high and the lights cut off and on.

The ac works fine in the car on all speeds until you crank the car up. then the ac only works on high and if the auto lights are on they go off if you turn the speed control in any other speed. the ac works fine if you turn the lights on manually but it still only works on high. I have changed the restitor on the ac , but that does not solve the problem.

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Replace the ignition switch.

Posted on Sep 16, 2009


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Why is the ac cold but doesn't blow high

It's the armature, high speed fan motor or maybe the switch could b broken, I'll look at it, 9494545252

Apr 30, 2016 | 1995 Lexus ES 300

1 Answer

1st Heater/ac stopped working replaced blower motor resistor still nothing..then today started blowing and won't shut off

liberty's are like that, complex fails.
lots and lots of liberty posts here. seems endless for such a new car.
first off, its all computer controlled over an network
so not scanning it first. is a failed moment.
the blower works on high all the time.
so if that is true, and it is. then the A./C must work
so only the A/.C is bad. see>
or one of 3 computers has dropped the ball. or is normal.
first off the A/C is cut for many logical reasons.
knowing that gives you lots of clues. as all reasons can fail.
posted 100 times here.
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  2. engine overload, (PCM knows this and tells AC to cut)
  3. high/low switch open (too much or too little Freon)
  4. evap core froze (icing)
  5. blower dead.
  6. BCM or PCM errors, causing A/C to not work. scan it.
  7. net work errors. causing lots of odd issues, scan it.
  8. its cut cranking, (ac cuts engine cranked)
  9. its cut when engine is wide open throttle so you can pass a logging truck and live, LOL. (just to have a full list)
  10. ECU or Transmission in Limp-home mode. (scan it)
  11. (other PCM faults. like idle controls out of control (that is why scanning is MANDATORY)

MAYbe more, read the a/c pages in the FSM yet. if not, why not?

Mar 16, 2015 | 2010 Jeep Liberty

1 Answer

1994 chevy kodiak with Cat 3116. Heater/AC blower shuts down

you should make a diagnostic to know what happened to your car
of course you need an auto diagnostic tool : http://www.chinasnoy.comand you can find all kinds of tools in

May 21, 2013 | Cars & Trucks

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2002 Jetta 1.8t cuts offs sporadically

Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Sep 10, 2009 | 2003 Volkswagen Jetta TDI

1 Answer

AC in my 2002 grand caravan is not cooling consistently

need to check and see if cooling fans are working and working properley at some point wheren the high side gets up about 225-250 they will kick in to a high speed untill the presure drops but the fans will always run when ac is on/also may be to much freon

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1 Answer

Ac controls quit working blower fan is running on high all thetime. compressor is not working.

fan elays are under hood in black box by battery. 3 of them. 2 for high speed, 1 for low speed. Default is high speed when there is a probem.

Suspect maybe they shorted something out when fixing dent. Did they do any welding on the van? Connecting the cables to the body can sometimes send voltage where it's not wanted.

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1 Answer

Ac & heater

Disconnect the wire from the fan, turn the car on, test the voltage between the connector to ground (chasis) on all fan speed settings (high,med,low). If you have voltage at all settings (approx. 12.3V on high and less as the speed setting is lower) then replace the fan motor (about $50 at autozone). If there is not voltage on all speed settings you will also need to replace the blower motor resistor (about $12 at autozone). The whole process takes about 20 mins.

Oct 09, 2008 | 1999 Oldsmobile 88

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