My Pontiac heater works occasionally, I have changed the thermostat and flushed the radiator but it still works occasionally. When the heat comes on it stays on and won't switch to air or vice versa stays on air and won't switch to heat even though the knobs have been changed.
I recently tried the DIY service and repair manuals from a website and it actually helped me repair transmission problem in my jcb 3cx site-master. It would'nt move forward or reverse, engine was good both solenoids for forward and reverse worked, but still couldn't diagnose the problem.
I don't have much technical knowledge but I just followed it step-wise, and now it works perfect! covers wiring, diagrams, torque specs, PCV, everything
got it from www.reliable-store.com
SOURCE: where is radiator drain cap 1998 pontiac bonneville
The drain **** is located at the base of the radiator on the drivers side. It looks like a butterfly nut.
SOURCE: heater blowing cold air on my 2003 pontiac grand
It could be a temp door actuator motor that is gone out,it opens the door to the heater box.
SOURCE: My van is jerking when shifting from first to
When is the last time you changed your automatic transmission fluid? Modern transmissions require regular fluid changes or they start to malfunction , generally shifting problems. Try a fluid change with any luck the transmission will go back to normal operation.
SOURCE: My 2002 pontiac grand prix
Hello, kevans222 and thank you for asking your question on Fixya!
Here is a simple process that will walk you through a few steps that
will pinpoint the overheating problem on your 2002 Pontiac Grand Prix,
without even using any tools. It has helped millions of people, and I am
certain that it will help you, because I wrote it for people in your exact situation.
How to diagnose your overheating 2002 Pontiac Grand Prix
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Thanks for the vote, and good luck!
Heater control valve, or blower doors jammed!
Air
Temperature Control Blend Door Failure No Heat
In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.
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