Heater fan speed controll

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Old 12-03-03, 12:35 PM
Waynefp
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Cool Heater fan speed controll

1992 GMC Sunoma V6 2.something engine with airconditioning question where is the heater speed controll block with the 3 little coils on it Located and is there a diagram avable?
 
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Old 12-03-03, 01:53 PM
Desi501's Avatar
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The thingy with the three little coils is the blower resistor. It is located in the A/C box between the blower and the evaporator. I don't know what diagram your referring to but if you want to see if it's the problem use a diode test light that shows power or ground and probe the plug while changing speed and you should find the ground (possibly power) moving to each different wire with each speed change. If you can find the signal for all speeds, the resistor is bad.
 
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