Question about 1991 Chevrolet S-10

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No HEAT! THe blower seems to work for the defroster, but no heat comes out.  The blower does not seem to work for the heat setting, blower does not seem to work

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GM products with digital climate control used a temopature sensor module which is located under the hood in the heater box. They are known to fail. It souns like your issue lies there. It is sort of triangular in shape and has a single electrical plug with 7 or so wires in it. (I ran a slvage yard for years and sold a ton of these!) There are a series of #'s like a factory I.D./part # that I used to identify and interchange with. I don't know if there has been a generic replacement released over the years. Hope this helps!

Posted on Jan 04, 2012

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The blower motor resistor is out and it is fairly inexpensive to get replaced around $25.00. 
This page gives an excellent answer to your question.http://www.stratusphere.net/blowerrepair.html
change resister 

Posted on Feb 20, 2009

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