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Pontiac Aztek Electrical & A/C problems

4 messages,  Last post on Sep 08, 2009 at 10:34 AM

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#1 of 4 Pontiac Aztek Electrical & A/C problems by lynbll Jun 21, 2009 (3:21 pm)
I would appreciate any advice on the most likely to be successful course of action for solving my problems - and I'm not sure that they are related.   My wife has a 2001 Aztek with just 66k miles. For the past 2 years the fuel & temp gauges take turns working - usually its the temp gauge that works. Just today the A/C blower just stopped working - one minute its fine, the next totally dead! I checked fuses and the a/c compressor spins and cold air weeps out of the vents - with no fan. The large relay/fuse does look slightly yellowed/burnt on the side - I pulled every HVAC fuse & fuse #28 (for BCM) - none were blown & still no blower fan.   Looking thru this forum I see potential causes as BCM, blower motor relay/harness, corroded wires under the front seat,...   Any chance of just a switch failing?   Separate failures, or related?   The wet wires is weakened as the temperature signal comes from the front of the car, not the rear & it is occasionally affected as well - in fact it was the first failure noted.   Are there any special steps to disconnect the seat electrical connections without setting off airbag in order to lift carpet. I also do not see any screws in door trim to allow lifting of carpet. I guess I'll just carefully "push" the door trim off.   The BCM replacement description is great - except that I can not get brightauto.com to register & Frugal Mechanic only lists ECM's. Where can I buy a BCM at discount today - if that is what I need? Of the related problems noted for BCM failure, I have only have remote unlocking issues - but the remote batteries are 8 years old - so is it batteries or BCM? The car battery is about 4 years old. I will trickle charge it tonight, as that is about the normal battery life here in Texas.   Obviously I could start replacing parts in a process of elimination - but that could get expensive quickly. Any focus that saves $ and mechanics time is greatly appreciated. Replies to this message: lynbll (Jun 22, 2009 8:31 pm) miwright (Sep 08, 2009 10:26 am)
#2 of 4 Re: Pontiac Aztek Electrical & A/C problems [lynbll] by lynbll Jun 22, 2009 (8:31 pm)
Replying to: lynbll (Jun 21, 2009 3:21 pm) Just replaced the blower motor resistor - fan is back working at all speeds. Plug was slightly burnt/melted at connector on hot wire. Hope that cause was resistor failure, not over-voltage from switch - sudden failure while operating leans towards that failure.   Still have the gauge issue with the fuel & temp. Will look under seat for rust/corrosion next. Hope that it is not an instrument cluster problem. Could BCM cause only a gauge problem?
#3 of 4 Re: Pontiac Aztek Electrical & A/C problems [lynbll] by miwright Sep 08, 2009 (10:26 am)
Replying to: lynbll (Jun 21, 2009 3:21 pm) I know your post is kind of old so I'm sure you're fixed already, but my car was doing the same thing... I popped off the panel under the glovebox, and found the wires going into the blower motor were at an angle... sometimes connected, sometimes not. Just adjusted the wires so they were always putting pressure on the connector, and voila! No problems since. Cheers, Mike
#4 of 4 Salvage yard by miwright Sep 08, 2009 (10:34 am)
I went to the local salvage yard today where they had three wrecked Azteks. Since Napa was going to charge 77 dollars for the "number 10" (passenger compartment fuse box), and no auto parts store could get the diodes... I was happy to pay fifteen dollars and get several of each! I highly recommend this. Cheers, Mike

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