While driving for awhile my camaro turns into a locomotive. It has fumes coming out of the coolant overflow tank. Sometimes when i turn it off the coolant comes out of the overflow lol.

I'm wondering what i should do?

I've bled the system, nvr overheats

 

start with a coolant sytem pressure test. it could be one or more of several things. what motor and year?

 

Have you swapped out the Thermostate? Are the fans turning one?

I would do a pressure test also.

 

im going to swap the rad cap, i believe the spring is weak

 

If the spring was weak it would just come out of the rad cap. Don't think its a bad head gasket letting exhaust in the coolant system do yoU?

 

FYI you can borrow a pressure tester from autozone, it comes with a cap tester adapter. They would probably let you test it in the store.

 

Now that, would be poopy. lol
Although if the gasket did go bad, it would be a great excuse to get the heads done and do some power adders, as well as nice new head gasket.
I do not think thats whats happening though..

I think the cap spring is weak and letting the coolant go into the overflow way to much.

I will start with the cap. Easiest thing first. If it doesnt fix my issure i will head to autzone Gorn, and pressure test :]