Mechanic says it’s not the head gasket.

[87 Supra]

Originally Posted by Syris

Well is there a big coolant puddle on the ground?
What color is the exhaust?

Do you hear any waterfall noises from behind the dash?
Have you burped the system?

Well like I mentioned earlier it is pushing coolant out the overflow so yes, there is a puddle on the ground. No the car does not smoke; there is no oil in the water or water in the oil. There are no combustion gases present in the radiator and no odd noises in the firewall either. This car is either breaking all the rules or it does not have a head gasket leak. As for burping the system, no I have not done that and really don’t know what that means. I’m guessing getting all the air out. I have ran it with the cap off and its not bubbling out.

[mizuboi]

by burping the system we mean raising the front end as far as it will go and run the engine for about 20 minutes and then fill the coolant as necessary that should help otherwise you might want to check the connectors onthe thermostat. check the dual vaulve on it too you know the blue one with two ports comming out of it...well thats all i can think of off the top of my head

and yes a bad bent old radiator can cause this also clogs in the places where the coolant goes

my girlfriends na did that for a while it lost coolant in teh system somewhere and then an hour or two later it threw it all up out the overflow tank so burping solved that well hope everything works out for ya