Question about 2002 Pontiac Bonneville

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No hot air from a/c vents on 2002 pontiac bonneville

A/c works great but when I want warmer air, nothing happens. I turn the dial on the electronic controls and no hot air, just cold

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  • Pontiac Master
  • 1,140 Answers

On vacuum operated systems: The dial temp switch or vacuum motor is defective. You may have a vacuum leak or loose vacuum hose connection.
On electrically operated systems: The dial temp switch, electric door position motor, blend door position sensor, photo diode sunload sensor or the ATC control module is defective. Check for loose wires at connection points on the motor.

Posted on Jun 17, 2014

  • trevino1970
    trevino1970 Jun 20, 2014

    I checked the connections...but they all look pretty secure with retaining clips and all. My car ATC type of controls and the display reads perfect when I turn the temp dials to hot. I also hear changes in the sound of the air coming thru the vents as I turn from hot to cold and vice versa. I checked under the hood fora possible heater core bypass ( since I bought the car used) but no bypass was done on it. I can the hoses going into the heater core and the temperature does get slightly cool warm when the dials are turned to hot but no hot air. modes work perfect too (defrost, floor, mix, and front). Any other ideas?

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Posted on Jan 02, 2017

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  • 70 Answers

SOURCE: 1997 Bonneville SSE, when the heater is turned on, only cold air

you may have a failed blend air door motor/actuator. this part will regulate the amount of air from the heater core depending on the temp setting on your electronic climate control unit. if it has failed, it will be stuck at the temp that it was last set at when it quit working. it is also possible the heater core may be plugged up, but using the gm recommended dexcool coolant and flushing it out every 5 years, it should not be plugged up. you can pull the 2 heater hoses off the heater core on the passenger side of the engine compartment firewall and see if the heater core is the problem. caution-do not use a high pressure air hose to blow through the heater core as this could damage it and cause a leak!

Posted on Oct 28, 2009

  • 3600 Answers

SOURCE: My 1999 Pontiac Bonneville will not start. When

The security system has been activated call the dealer to getthe deatils on how to reset it, normally you pull the security fuse for 30 seconds to restet it. if that does not work call the dealer and they can help you.

Posted on Nov 01, 2009

  • 105 Answers

SOURCE: 2002 Pontiac Montana, No Heat, I put the temp control on

the cabel from the heat dial to the heater box behind the dash could be snaped or jamed thus not opperating the lever which operates the flap which open and closes the heat box next to the matrix. or if your coolant is brown in colour it could be your matrix is clogged with sedament and needs flushing out. or it could be your water pump not pumping coolant round your engine or it could be a knackerd thermostat i hope these will help you id start with the easyest first thermostat

Posted on Dec 17, 2009

  • 1 Answer

SOURCE: 94 pontiac bonneville... eats alternators, stalls

i have a 94 pontiac bonneville that stalls while driving. It seems to die always when I drive the car for more than 20 minutes. (During traffic) It recently has had a tune up (oil, oil filter, plug, wires) Replace module and fuel filter as well. I have had two different mechanics look at my car and no codes showed up for them. They mentioned fuel pump and crank sensor, which they CAN'T guarantee this will fix the problem. I've done some research online and have read that people with same problem have replaced both and this did not fix the problem. Any other suggestions??????

Posted on Mar 21, 2010

  • 67 Answers

SOURCE: looking for the air conditioning relay on 1993 pontiac bonneville

underneath the hood against the firewall there is a fuse relay panel.. the a/c compressor relay is the very first relay all the way to the passenger side

Posted on Jul 10, 2010

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