so when i turn my heat on, after the car is all warmed up, it stays hot for about a min and then gradually becomes just cool (not air cond temp and not hot just room tempish). anyone know what the problem is?

 

Vacumm leak. Does the control for directing the air to Windshield, Front and feet work ok?

 

this is shot in the dark but when i first got the truck the coolant level was only just enough to cool the engine but not get to the heater core. at least thats what i figured cuz once i topped the reservoir off the heat started working again.

 

leadfoot-im not sure ill check but i know the defroster setting works fine and ill check the coolant as well

 

Could be air in your heater core. Does it get hot again when you rev the engine?

 

My vote is for air in the heater core or low coolant. Or both.

 

How recent is your coolant?

 

it was actually the coolant level, i never would of thought to look there so thanks necrocom

 

So, now what are you doing to find your vacuum leak? if you don't find and fix it, you will over heat your engine.

 

i dont think i have a vacuum leak, all the settings work and it now stays hot due to me adding more coolant