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While we're talkin' Buicks-

M

Mike (WA)

Well-known Member
'99 Buick Park Avenue.

Heater and all works great for about half an hour- then starts blowing cool air. Not "outside cold", but cool enough to make the Mrs. whine. And if I wasn't so stoic, I might whine, too.

Car has optional passenger seat heater controls- she turned hers up to max, and it started blowing warm for her- but mine is still cool.

Not a problem of low coolant, etc.- that's all fine.


Any ideas?
 
mike, i'm gonna go way wild on this. does it have the battery under the back seat? if so, remove the seat and follow the battery ground cables. they should run up to the rear strut towers. remove the cables where they connect to the body, clean up the cables and the mount points brite and shiny. then reconnect them. i am guesing you have a weak ground and the body control module is getting confused. if you hook a scan tool up, it will prolly have trouble comunicating with the main ecm on the vehicle. i had a park ave come in last year, car was randomly loosing control functions. power windows quit, then the radio, then the heater, then the power locks. took a while to track it down, i thought it was a bad fuse center, but it would not communicate with the scanner. bad grounds. after you get all the cables cleaned up, let the car sit with the battery disconnected for about an hour to clear the bcm, then hook it back up.
 
What glennster says makes sense. With all the electronics on a vehicle nowadays a bad connection or ground can play havoc with a system. When I worked at a dealership a customer brought in a Mustang that was several years old. When you turned on the headlights, the wipers would start working, and the wiper switch was OFF. It had a bad ground.
 
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