1993 GMC Suburban clicking noise under dash

1993 GMC SUBURBAN
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REDNECKSULLY
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Heater problem
1993 GMC Suburban V8 Four Wheel Drive Automatic

there is a clicking noise when i start and turn off the car, and when i change the heater fan position. now the fan wont blow, and still clicks. Can you please help by emailing me a diagram of how to get heater fan from under dash please
Jan 30, 2010 at 1:47 PM
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EELTTAM
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"...there is a clicking noise when i start and turn off the car, and when i change the heater fan position..."

My 96 suburban is doing the same thing. I've also heard this noise in other full size GM trucks... I'd like to get it fixed, it's quite annoying.
Feb 7, 2010 at 4:59 PM
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CJDUHON
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Get it to a good mechanic quick. You have a short in the electrical and they can fix it fairly quickly. I brought mine to a good GMC Mechanic in town I've grown to trust and a light switch needed to be changed out.
Mar 13, 2012 at 3:49 PM
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DRCRANKNWRENCH
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It is probably a relay as they ca keep clicking even after you turn off the truck. It will eventually put a pulse load on components or it is being caused buy a component and I thingk the advice above is good to take as it is something that can damage sensitive electronics
Mar 13, 2012 at 6:39 PM