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Only blows cold air with the heater turned on, engine warmed up and good temp on gauge.

(1999 Ford Explorer)
in Enid, OK on October 05, 2015
I let the truck warm up and the gauge shows good temp but there is only cold air blowing. What can be the cause?
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Popular Answer
on October 05, 2015
is the hot/cold knob when turned back and forth making a little humming noise,windows up,key to ON,NOT START,very quiet inside truck.listen close.post findings.
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