Squirel
Newbie
I have had my '91 since December nad have just gone through my 3rd heater control module. The second one actually quit and then started working for a while. Asny idea's on a cause and more importantly a fix.
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Display? All I have are knobs. I didn’t know they even offered auto climate control, especially in 91.
What exactly stops working in the module? Usually it’s the fan speed people lose, as the blower motor has inadequate wiring and burns out either it’s own connections, or worst case, the HVAC controller itself.
Remove the glove box and trace the blower motor wires to its plug. If the wires aren’t already burnt looking, the plug probably is on the inside.
I added a bigger high amperage plug (the kind used with hobby RC batteries), and added an inline fuse between the motor and it’s power source. This way if it were to go wacky, it would blow that and not anything expensive or difficult to replace down the line.
Every thing looked normal. Would a problem with the blower motor affect the rest of the module, as in the whole control dieing and going blank?Okay cool, I have some older cars with non auto units like that. I have a 95, so excuse my ignorance.
I think the blower motor problems still exist, regardless of what type of control unit you have. What I don’t know however, is if that problem is present, how it affects the older style control units.
When you replace the unit, did you ever notice any burnt or otherwise damaged wires or connection points?
'91-'94 (I think) got these units. I always thought they were kind of cool. No actual temperature settings in degrees or anything fancy, just digital controls and display.
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