SICKBIRD

When Dynoing Coolant Started To Overflow From Resevoir Twice? What Can Cause This?

ss rally red

iTrader: (8)

If the car is NOT overheating my first shot would be to say that the coolant resivour was overfilled to begin with. Should start out at the low mark if the engine is cold. I have noticed on a lot of the cam swaps that we do that if you fill the resv. too full to begin with that it will puke coolant till it levels off at the lower end of the stick.

SICKBIRD

It Wasent Overheating Hope That Was The Problem

sr71bbjr

iTrader: (52)

Well kinda sounds like somthings peresurizing the coolant system.Do you have stock heads?

SICKBIRD

Stock 5.3

RUDY@AP-ENGINEERING

Did you have any work done prior to dynoing the car? IE heads and cam etc.

DaddySS

Did they have fans running for air flow? It wouldn't be unusual for the engine to get hotter than normal, but overheating, if they were not running fans.

SICKBIRD

i dont think they had fans

jurisz28

iTrader: (6)

Check the thermostat. It sounds like its not opening when it should. I've had this problem before on other cars.

HumpinSS

iTrader: (1)

make sure the coolant lines that go from the tb to the radiator arent reversed

Full-Force

iTrader: (11)

blowed head gasket will put build compression in the cooling system

TNormZ28

iTrader: (9)

Yep. Did you use new gaskets and head bolts when you replaced the heads? Also could be a air pocket in there, or like someone else said the thermostat not functioning properly. Check the thermo and burp it, then check the head gaskets. Good luck.

5w20

iTrader: (21)

correcto

Mike K.

mine did that with my first aftermarket resevoir cause it did not have a return pipe so It would fill up the resevoir and once full just spit it out the top when the car got hot . I'm assuming you still have the stocker so is the fluid going up and down in the resevoir? should be down when cold and full when hot. Or is it always full?