2004 Pontiac Grand Am Air Condition/Shorting/delay

Tiny
KENDEGREAT
  • MEMBER
  • 2004 PONTIAC GRAND AM
  • 4 CYL
  • 2WD
  • MANUAL
  • 90,000 MILES
I have a wierd problem, For about two months when my AC/Heater control knob is turn to the reguler ac mode so the air would come out the normal vents. I t comes out of the defrost and down at your feet (Comes out all vents) The last few days when I get in and sart the car. Nothing inside the car (Electrical) works. The engine is running however I have No AC, No Raido, no dash lights, etc. Then within 10 to 30 seconds everything comes on. One time I was moving the Control knob on the AC speed from max to a lowere setting and it caused the problem to occur. Then last night when I went to pick up my daughter it smelt like I could smell a electric wire short. Rolled the windows down. And today everything works and seems fine. Any hints?
Wednesday, November 11th, 2009 AT 8:34 AM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome to the forum, thanks for the donation, I'd check all battery connections. I hope you find the problem before something burns up? When the problem occurs, pick one circuit that doesn't work and check fuses. Use a testlite and check the fuse circuit for voltage. Some circuits are hot all the time, some go hot when you turn on the key.


https://www.2carpros.com/forum/automotive_pictures/170934_04_heater_assembly_1.jpg



Not sure if you can read that? When I tried to enlarge, it didn't show all the fuses. It's the fuses for the havc control assembly. You have to test when the problem is ongoing. If your afraid something is going to burn up on you, you might take it to a shop.
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Friday, November 13th, 2009 AT 1:50 PM
Tiny
KENDEGREAT
  • MEMBER
  • 2 POSTS
Thats all well and good, except that it does it every onece in a while and it only last for 10 to 30 Seconds.

How is the AC Control Knobs work? The reason I ask is that iis where my problem starts and at one time I moved the spped knob on the AC and caused it to happen.

I didn't do it again because I didn't want to press my luck.

All conections at the battery were taken off, cleaned and reassembled. All fuse are okay.
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Saturday, November 14th, 2009 AT 6:46 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Yeah, intermittent problems can be difficult. All I could do would be to track the circuit. I looked at some service bulletins for your vehicle, nothing stood out, that I noticed?
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Saturday, November 14th, 2009 AT 8:42 AM

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