chung

Hi all I just changed the header tank cap and have noticed that the bottom hose is now cold and had a little coolant seeping out of the side and the top hose was hot and pretty solid and hard to squeeze.

Over the weekend I checked the hoses on sunday and they were both warm both of them you could squeeze when the car was running.

Do you I have an airlock and can just putting a new cap cause this?

Sorry for the long thread

Thanks

lukeb555

Sounds to me like the thermostate could be stuck closed, if top rad hose hot and bottom hose cold, run engine with cap off to get any air out,

Billet

iTrader: (60)

if the thermostat was closed then it would be overheating, however there have been cases where it hasn't

chung

Theres been no overheating

Billet

iTrader: (60)

then its 98% that the thermostat is ok. if there is an air lock then start the car from cold with the header tank cap off and wait till the air bubbles have come out, by doing this your are eliminating another possibility

chung

Thanks will try it tomorrow, is this quite common problem when air is trapped in the system?

Billet

iTrader: (60)

i wouldnt say common, but it does happen.

L.J.F

iTrader: (31)

Do a search on these forums for a procedure on how to clear air locks mate

chung

I tried to do the airlock thing now the raidator doesn't warm up and the bottom hose is still cold can this be the thermostat do you think?

GUNNER

Had exactly the same problem on a car ( not subaru ) and the water pump had failed resulting in no flow through the rad to cool down the water ,top hose was boiling bottom cold because it can't circulate. worth checking?