Ok guys this ones got me. My 92 rs runs hot, as in around the red line when the hvac selector is on hot, but it runs about 180 when i set the lever to cold, i temporarily hot wired the fan,but no dice it still does it. Please help me its cold

 

Somehow too much coolant is bypassing the radiator by flowing thru the heater core. On my Astro it gets coolant from the front of the intake manifold. There is fitting with a hose clamp around it. I soldered a penny to the the top of the fitting and drilled a small hole in it to limit the amount of coolant going to the heater core.

I guess the RS is TBI? If it is, the heater core supply is on the back passenger side of the intake I think.

 

I have the correct intake gaskets on and it is all still ran through the control valve,and all that crap. but i did check and with the car running more coolant flows throught the return line on the radiator with the hvac lever on cold than hot, i only get a small stream on hot, it really blasts out on cold

 

If its cold where you are and you really need heat NOW, i'd say take the valve right out and let the coolant flow through the heater core all the time. It's not really the proper way, but it wont hurt anything and you'll find out if it was really you're problem or not. You probably wouldnt even notice its absence until spring when you cant turn the heater off all the way!

 

Are both hoses to the heater core getting hot (coolant flowing
through the core)?? Is the radiator low on coolant?

 

yeah the coolant is flowing and the radiator is full i even jacked up the front of the car just to make sure i got all the air out