this only happens during the cold months when i have to use the heat..when my car is at 195 and up the air coming out of the vents cool...almost like running the full cold setting without the A/C....and other times im sweatin...

im gonna check the thermostat tomorrow..maybe its stickin closed
any other ideas?...maybe the heater core?

if it is thats odd cuz that would be the third one in a year

later

Rob

 

i had the same problem a little while back.. i diagnosed it as being the heater diverter valve. its that goofy looking mushroom thing, check to see if it has the vac. line atteched right and stuff.

 

It could also be the vacuum line to the air diverter flap actuators, if you have the later model.

Third thermostat or third heater core.?

 

definitely check the heater vavle thing.. something is just not letting the hot air get into the car..

 

why two heater core's in one year ?

 

My IROC never gets above 150*, and my heat is never warm either. It's just like outside air. Where would the heater divertor valve be?

 

IIRC...mine doesnt have one..its on the passenger side of the engine bay, just follow the heater lines from the firewall, its a little black housing I believe

 

Did you install the the front of the heater box right? I know there is a wire that opens and closes the vent to let the hot air through. Just a thought, everything else have been brought upi that I can think of.

 

i havent benn able to pop in here because of work...i havent drivine my car much in the last week or so...and today when i got home i put some more gas in it so i didnt get any condensation in the tank or lines...i cranked the heater on after my car had warmed up and in about a minute and a half i was opening the window...

why is it intermittent?

 

My friend finally figured out why my heat wasn't working. The cable that connects to the Cold/Hot lever had come undone from the cold/hot air switch by the heater core, so it was stuck on cold air.

 

Make sure it's completely full of antifreeze. How does the antifreeze look? If it's full of gunk, you might have plugged the heater core. Have you tried a new heater valve, or just bypassed the heater valve?

 

here man i had time and i did the search for you...

and this is a previous post from a user a while back that couldnt figure out why he wasnt getting heat. hope i could help

https://www.thirdgen.org/techbb2/sho...diverter+valve

 

And this is a pic of the heater diverter valve.