I HAVE AN 04 EVO EVERYTHING RUNS OK NO CHECK ENG LIGHT NO OVERHEATING, ECT ITS JUST WHEN UNDER BOOST (20psi) WATER FILLS IN THE OVER FLOW BOTTLE SO I PUT THE WATER FROM THE BOTTLE BACK IN AND IT KEEPS DONG IT ANY SUGGESTIONS

 

Bump Need Advice???

 

calm down man, water over flow? Are you referring to the radiator overflowing coolant?

 

More Info..... Does it bubble ? does it overflow from the overflow tank ?

It may be a blown head gasket.

 

Hg

 

It Overflows From The Coolant Tank. I Have An Hks Metal Hg And Arp Headstuds 20 Psi Nothing In The Coolant Its Normal Coold It Be The Radiator Cap?

 

might have to re torque head studs

 

hg

 

woooooo slow down big billy, lose the caps. help us get this straight here, water fills the over flow tank and you put it back where? does it overflow? do you let the car cool down before you start "putting it back" what is the level in the overflow tank when the car is cold?

 

How much does it overflow? because it's supposed to

It fills up about a cup when it's hot, then as it cools it gets sucked back in .

JUST A CUP OR SO IS NORMAL

 

The Car Doesnt Overheat The Temp Is Normal When I Drive The Car For An Hour Or So Pop The Hood The Tank Is Full Of Coolant Pushing Out The Tube On The Side Its Not Boiling Hot Its Warm Seems Like Pressure Buiding Up When It Cools Dowm I Open The Radiator Cap And Air Surges Out SO I REFILL THE RADIATOR WITH THE EXCESS COOLANT FROM THE RESERVE TANK IT DOESNT GO BACK IN THE RADIATOR WHEN THE CAR IS COOL IT STAYS THERE

 

pressure test the system

 

I refuse to read anything you type without proper punctuation. Re-type it, un-capitalized, using periods and commas, and you can expect about twice the amount of posts you have received so far.

 

English Police on the prowl.

 

I have the same issue. I get normal hot coolant expansion, but the coolant does not get sucked back when cold. No overall coolant volume lost.

I replaced the rad cap in case of a bad return valve. My next guess would be an air leak between the coolant tank and rad, because there is no leak in the pressurized system. Maybe unpressurized coolant can flow to the tank, but air is sucked back into the rad?

Any one else have this problem?

Thanks.