Question about 1991 Chevrolet S-10
1991 Chevy C1500 P/U; the digital heater/AC control failed gradually, first acting strangely, resetting, then going completely dead, not even LCDs lighting up. I've tried two used controllers, one labeled as ''tested'' with the same results. Because of the $380 price of a new control, I'm reluctant to purchase until I'm certain it's not something else. I have 12VDC and ground in the plug and 8.5VCD (strangely) also. The Haynes manual shows 5VDC on a Tan wire; the only tan wire has 0 VDC. I'm not confident about the Haynes manual wiring diagram. That's where I am now.
Try checking behind the glove box...there is a connection that has a red wire and two green stripped wires....on my 91 the connector melted a little and broke the connection ...if this is so the heater control will work sometimes and not sometimes...or not at all...I just cut the connector off and reconnected the wires and everything works great.
Posted on Nov 05, 2013
IT IS VERY POSSIBLE THE BLOWER SPEED CONTROL MODULE IS DEFECTIVE OR SHORTED, THIS WOULD CAUSE ALL KINDS OF STRANGE SYMPTOMS, THE TAN WIRE BEING DEAD LEADS ME TO THINK THIS IS THE PROBLEM.
Posted on Feb 25, 2009
Just check out the other end of the wire to make it confirmed.also cjeck out other wirings are they getting cut in between or connected loose.
Posted on Feb 23, 2009
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Posted on Jan 02, 2017
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