james-wrx

guys car is getting very hot coolant is full up but coming out of the overflow, when driving along it getts hotter than when sat in traffic I would expect it to get cooler not hotter! It's all very strange im thinking it must be an airlock as it's not loosing coolant!

I filled it up previously through the plasic thing on the passenger side of the engine bay not the header tank, would this be the problem?

500

You fill it up at the header tank, and keep the other bottle topped up. by the sounds of it, if it's not an air lock, it could well be a water pump failiure. when the system is cold, take the cap off the header tank and start the car, you should see movement in the tank straight away

james-wrx

ok thanks, im thinking it's a airlock because it was fine until i lost a load of coolant and refilled it via the plastic thing!

stuart148

iTrader: (12)

iv got the same prob mate,,,im just getting new water pump and uprated 1.25mm head gaskets (as it might be the head gaskets that have gone)

iv just had a engine rebuild ,,and got the car mapped up to 1.4 bar (after 2k miles),,,and i think this has caused the heads to lift on boost,,all is fine if i keep it off boost

stu

stuart148

iTrader: (12)

ps,,the plastic thingy is only a over flow,,,

wait till morn and take the tank top off ,,,(dont do it when hot),,,top it up,,turn the engine over,,,top back up

run the car,,,then the next morn,,look to seee if the water level has dropped

stu

james-wrx

just drined and refilled took it for a test drive gauge started to creep up again, tried to squeeze the air out of the hoses and noticed the top one was under pressure and hot and the bottom one was stone cold!!

Now im stumped!

debbiesonic

iTrader: (7)

Can only be one of 3 things.

Blocked radiator
Thermostat not opening
Headgasket

Not particuarly in that order, but worth checking or temporarily removing your thermostat,if that does'nt cure it, remove the rad and reverse flush it. If still no better, you will be looking at a head or headgasket fault.

james-wrx

Hi thanks

i filled it up again last night, was fine this morning but temp started to creep up if driven hard, checked the pump and it seems to be flowing o.k water is coming out of the small rubber overflow by the battery though, the other thing is the rad seems to have a tiny hole in the top corner, when i was squeezing the air out of the bottom hose i could hear air coming out of the header and the little hole!
Would this explain why i cant get the air out?
Why would it be coming out of the overflow?

Thanks

500

The hole in the rad will cause the problem you are having. When the cooling system gets up to temperature, it pressurises and keeps the water from expanding too much, also keeping the temp down.

dansti300

hi sounds same as what mine did a bit back turned out to be headgaskets
thanks dan

james-wrx

Im now very worried it could be the headgasket

having said this wouldnt there be some sort of smoking, I can honestly say there is zero smok at all and only a tiny bit when the engine is cold and it clears very quickly, dont want to buy a new rad only to find out it's the headgasket as well!

james-wrx

hi Dan didnt you have any smoking or condensation when it was cold, when my headgasket went on my Audi it smoked quite a lot when cold then went away when hot and ran fine!

this car doesnt smoke at all ..............ever!

WRX_Dazza

change the rad.....

small price to pay to save the engine!!!

dansti300

hi james no just a little on start up then went away i flushed my rad and changed the thermostat still no joy the still kept going up when i had headgaskets go on previous cars alot of white smoke has come out of the exhaust
thanks dan

james-wrx

It's difficult to know what to do beacuse there is a hole in the top of the rad as well!

dansti300

same as wrx dazza change rad first and go from there