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try checking the thermostat that is what it was in my car i got a new one and now i have to turn on my ac in the winter time that is how hot it ran in my car try that

look at the right side of the lower dash. see that the plug is secure at the bottom. came unpluged on me. pluged it back in and worked fine.

try flushing the heater core

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โˆ™ 2009-10-28 00:09:09
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Q: What could cause a 1999 Chevy Silverado to have no heat and seems like air condioning runs all the time no matter where the temp switch is?
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