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Originally Posted by usedranger
My A/C/heating control panel LCD display quit working on my '95 LeSabre so I got a replacement from the junk yard. I took the old one with me to be sure and get one that matched. It operated just fine for about a week. Now, It operates fine on start up: Temp and function is shown. I can even change the temp setting from the steering wheel, but after a few minutes the 9 panel buttons blink randomly, about a second each. The system then goes into a “default mode of just the front defrost/windshield blowing air. Restarting the car tends reset the system but the random problem returns after a few minutes. I can still change the temp setting from the steering wheel button. At least the number display changes. The passenger control on the door does not seem to be affected, but I cannot operate the rear defroster. I checked for loose connections but did not find any. The connector seems to fit just fine. I did disconnect the positive cable to reset any codes during the installation. Anyone have a suggestion? Thanks!
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Did the replacement come from one of these models?
BUICK LESABRE 1999
BUICK LESABRE LIMITED (1995 - 1998)
BUICK PARK AVENUE (1995 - 1996)
BUICK PARK AVENUE ULTRA (1995 - 1996)
BUICK RIVIERA (1996 - 1999)
They should all be interchangeable.
Without seeing an electrical diagram the only things would be connections. It might be the ground buss in the door frame on the driver's side where several dash area items ground. Some of those have lots of corrosion probably from cars in wet areas or with lots of snow carried onto carpet into that area by feet.
I had a 93 that would lose control of the manual HVAC and door locks because that ground buss was corroding.