i live in missouri and it is freakin cold. the bearing were going out in my fan clutch, repalced it today, truck still will not warm up over 155-165 degrees, i turn the heater on and warm air comes out at first but turns cold after maybe 45 seconds if that, think i need a new thermostat or could my heatercore be bad ? i do not think heater core is leaking. guy at shop said it would fog up my window or somthing. any suggestions short of getting power inverter and space heater?

 

have you ever changed the coolant?

 

ya the coolant is fine still rated ok had it checked today, would a flush help?

 

probably not if its ok.
i would replace the thermostat. probably stuck open. and if not, well, its only a $10 part.

 

thanks will try and let you know

 

I agree, thermostat is first plave to look if it won't heat up.

 

quick question about this, does having the heat on use more gas (like with the ac)?

 

i dont think it uses more gas just more electric being as the heat is a byproduct of the engine and all it needs is the fan to blow the heat in the cab using the heater core.