Question about 1990 GMC Sierra
Generally these controls go bad and nothing works. They are an imported item GM uses of course. The electronics short circuit and go completely dead. Best to find a used one that works for new ones are expensive
Posted on Dec 31, 2010
Hi and welcome to FixYa!
I'm suspecting that you have a faulty pcm (powertrain control module). The PCM has connectivity on all electrical current that runs inside the car including the engine, transmission, internal accessories, lights, etc. If the PCM is faulty something will surely fail.
I strongly suggest that you replace the PCM to resolve the problem.
Hope this helps and thank you for using FixYa! Happy New Year!
Posted on Jan 01, 2011
This trucks had common problem of the blower motor resistor going bad or
burning out and it would only work on high speed. The resistor is
located under the passenger side dash by the blower motor.
Also, I suggtes check the wiring diagrams for any blow/fried connections...
Posted on Dec 30, 2010
My Chevy truck has fuses for the heater in both the dash fuse panel and the engine compartment fuse panel. Maybe yours does too. Mine's newer than yours though and may be different.
Also being that it's the control panel that's not lighting up, it could be a fuse that involves the dashboard control panel rather than the heater/ac fuse.
Posted on Dec 29, 2010
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Posted on Jan 02, 2017
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