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Originally Posted by srpope80
Maybe I'm a little confused..... If the heat is not working, wouldn't that be caused by the heater valve and not the thermostat? Is the truck overheating? If not, I would look elsewhere besides the 'stats....
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no heater valve; coolant is always flowing thru the heater core. heat happens when the flaps lift off the heater core so the air circulating gets heated and directed into the cab.
no heat could mean
those flaps aren't operating properly.
or the coolant system circulation is disrupted (hindered)
or the coolant system isn't getting up to temp (stuck open thermostat)
have to do some checking and give more info to narrow it down.
//bc