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Old 10-02-2011, 07:21 PM   #2
Schurkey
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Join Date: Mar 2006
Location: The Seasonally Frozen Wastelands
Posts: 439
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You need to figure out why the heater control on the dash won't shut off the vacuum to the heater valve.

Temp sensor on the head prevents the fan from blowing cold air when the heater control on the dash is set to "heat", and the engine hasn't warmed up enough. (GM could do that in the '60's, but can't manage to figure out how to do it on my 2003 Trailblazer.) Sounds like the temp sensor has failed--always has continuity instead of opening the circuit when cold.
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