Ok I have a 95 LT1 transplanted into a 89 Camaro. The problem I am having is, tonight I drove it around and the temp gauge would not go past 150. That was with the fans off. I brought it home and let it idle in the driveway. The temp got up to 215, fans did not turn on, however coolant started pouring out the overflow. I pulled the fan switch out of the waterpump, and there was plenty of coolant coming out of there. The radiator has a aftermarket cap on it. Any ideas what my problem is?

 

simple, your gauge doesnt work.

Verify the actual temp, and why your fan didnt turn on. Check the fan definately.

 

Maybe you had an air pocket in the cooling system, remember that the sender will not read acurately if not submerged in coolant. Bleed cooling system.