099gt

i had coolant coming from the thermostat so i went out and bought a 180 degree therm. and new rubber seal with it. and the thing still leaks is there some special way to put it on?

099gt

come on i no a few of u have done thermostats has any of yours leaked after u put it on

badass04gt

did you use silicone sealer (rtv) on both sides of the gasket and the housing?

099gt

no.....the could be the problem i didnt see any old sealer on it so i thought u could just replace it

devinsteen

Sounds like you have a cracked manifold[] THey usually crack out the t-stat housing....same thing happend to me. I thought it needed a new o-ring,, but it turned out there was a crack inside the t-stat housing.

badass04gt

On my camaro, the same thing happened. After 2 new thermostats i used the rtv on the gasket and it was fine. If that doesnt work you prob do have a cracked t-stat housing or manifold like devinsteen said.

Casper98GT

First remove the 2 bolts... remove rubber gasket and then thermostat. Put in new thermostat, put rubber o-ring/seal over it and put hose back on and tighten bolts down.... If it doesnt work something is wrong.

mustang_montana

hes got a 99 though, so its not likely to be a crack manifold. sometimes when i change o rings i bolt em down too tight so they twist and leak. definetly unbolt it and check, and use the gasket sealer..it saves lives.

Acer2428

99's were just as bad. THey didn't use the alum. crossover until late '01.

devinsteen

Thank you Acer. Like I said, it might be cracked....hopefully it's not. But it's not just going to leak coolant for no reason.