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Re: 92 c2500 heater control problems
Found the issue. Checked for voltage at the relay behind the glove box. Terminal 87 ( going out to the ac system) had 12 V on it. So did the pressure switch on the condenser. So I tracked it in between the two. There is a 3 conductor plug in under the dash ( Red, Dk Grn. and Grn) This had melted between the red and the light green connector. Cut the connector out, wired it together and all is well. Thank you all for the help.
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Matthew Brough 
1997 Geo Prizm -- 301,000 miles
2000 Honda Accord -- 225,000 miles
2004 GMC Yukon XL -- 223,000 miles
1987 Jeep Comanche -- 116,000 miles
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