I have an 86 iroc 305 tpi and my heater core recently went, i know that causes coolant to leak so i have to constantly keep filling it, however within the past couple of days everytime i go anywhere, even when im full on fluids i still overheat, do you know what could cause this? I hope its just the heater core that ill be replacing this weekend, but if anyone else can think of what might be causing it please let me know, thank you.

 

if the cooling system cannot hold pressure it allows the fluid to boil at a lower temp, and this will allow the car to overheat.

 

what would be making my cooling system not hold pressure, other then the leak from the heater core?

 

the leak in the heater core thats its you can bypass the heater core for now it you dont want to switch it out yet

 

Hey sounds like you should do a pressure test on your cooling system this is the fastest way I know execpt for a good visual you did do a good visual? Also I would put a big piece of card board under the car and let it run for a while and see if you can find anymore interesting wet spots. And don't forget that inexpensive but all important Tstat and radiator cap. I hope its not a head gasket. Hope I HELPED!

 

no its not the head gasket, im switching out the heater core this weekend, i just wanted to make sure that there was no other possibilities becuase i want to fix that problem all in one shot if possible.

 

Hey dont mean to jack your thread but my heater core went the other day, how can I bypass it? I just dont feel like spending $100 for something that i wont need for another 5 months or so

 

nevermind I checked out a diagram for the flow of the coolant and see how to do it