I’m experience intermittant heating in my truck. After truck has ran
for several minutes it will warm up then start blowing cold air. Is
this the thermostat? Also the temp gauge goes hot and then goes right
back to normal. Is this going to cost me a fortune to get fixed?
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Suspect a sticking thermostat.... it will close off when completely cold,
and will open at 195°F (or higher), but won't close again as the temp drops
around 180°F or so. I'd start with replacing the thermostat - <$10 and
about 30 minutes worth of work - and go from there.
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