Originally posted by SableSal:
Originally posted by JEDsContour:
Do you have a V6? The 2.5L's are notorious for water pump deterioration. Relatively cheap and easy fix ââ?¬â?? if nothing else damaged.

Another more ominous possibility is cylinder leakage (exhaust) into the water jacket. This would be very bad news as it would indicate a bad head gasket (at best). Similar result to what you describe: coolant forced out of block under exhaust pressure into the radiator and overflow tank.

A compression test might reveal it.

Try replacing the waterpump first




Ouch, don't scare me!

You think water pump eh? Hmm... Coolant is getting forced back into the tank.

Hmm, I may try that. But there are no signs of water pump failure. Is this common?





Sal


Yes I think water pump. The plastic impellor comes loose from the shaft. No leakage, bearing is still good, no water is pumped.

Localized boiling in the engine will produce enough vapor to force out coolant.

Change the water pump. Simple job.

P.S. Why did you post this in 3.0L Duratec?

Last edited by JEDsContour; 06/22/06 05:48 AM.
99 Tropic Green SVT, Tan Leather, 20K miles, "Nice Twin" (factory stock). 99 Tropic Green SVT, Tan Leather, 28K miles, "Evil Twin" (Turbo AER 3L and more in progress) 96 Red LX, Opal Grey Leather 2.5L, ATX, 22K miles