oli_p

iTrader: (4)

Have just replaced coolant temp sensor on a 2003 wrx.

Have left the headtank cap off and let car idle with heaters on hot, with the occasional squeeze of the top rad hose, but car seems to be getting hot still.

Also when should the fans kick in??

This is not a headgasket problem, as its just magically started to happen after I replaced the sensor, so obviously im doing something wrong when trying to get the air out the system.

Thanks

oli_p

iTrader: (4)

Also the AC has been removed if that will make a difference to the fans not kicking in??

oli_p

iTrader: (4)

right fans deffo work, as read on US forum that if you unplug the coolant temp sensor then turn ignition on fans will run all the time, which they do.

So what does this mean???

oli_p

iTrader: (4)

just used the test plug under the steering wheel, and the fans come on with that aswell, so I believe that means the fans are working as they should, so possibly just need to remove air from the system properly. Is it about 3/4's on temp gauge fans should kick in normally??

blackvenom

Never noticed my classic ones working, tho I never sit in traffic so I guess the temp needs be over 1/2 but that's just a guess

bmw730i

On my classic the temp never goes above half and when putting it back in to the garage the fans kicked in and was still on half on the gauge

oli_p

iTrader: (4)

well ive just tried to bleed system again, this time I topped coolant up in header tank, removed the coolant sensor again whilst header cap was off, should remove most of air out of the system, and then ran the car again, but car still going up to just under the red and no fan kicking in, so unsure if I still have air lock or its just the fans not kicking in now

bmw730i

As a test put the fans on constant and see if the temp still rises, was it a genuine temp sensor as not unheard of for cheap ones not to work straight out of the box and be careful letting the temp go to high

oli_p

iTrader: (4)

newage impreza, only have the one coolant sensor, so if I unplug it to put the fans on, I won't be able to see the temp in the car :/

oli_p

iTrader: (4)

well id say its an airlock still, even though the coolant stops bubbling after a short while with header tank open.

Just took car for another short spin, even though temp gauge was already showing a 1/4, probably got 1.5mile before it was over 3/4's again.

Top it off the dam sensor hasn't cured my start issue which has pissed me off even more :/

oli_p

iTrader: (4)

just checked my rad hoses, top one is very hot, yet bottom one is near enough cold aswell, so guessing theres an issue with my thermostat aswell, so looks as if I have airlock and thermo has gone. typical all this crap when im was planning to advertise car in next week or so

oli_p

iTrader: (4)

anyone else shed any light on my issue, or what im doing wrong when trying to get rid of the air lock?

Baz82

Have you used the search function , there is a lot of threads like this one

maydew

iTrader: (9)

Believe the newage have two sensors one for the ecu and one for the fans so i believe.
Drain the system completely and refill through the turbo ie remove small black pipe from header tank push a funnel into it and fill through the turbo .
Remove all rad caps until the level comes to them ,this method back fills the system and you will never get an airlock

maydew

iTrader: (9)

Remember to put the heater on full. Also once the temperature is up to half way mark (normal) it wont go any higher or lower even when the fans are on as it can sit in the same place for 80c-98c,it only goes above the half way mark when you have a problem

oli_p

iTrader: (4)

ended up taking to the garage in the end, ended up being the new sensor at fault, had replaced the old one and was fine. Bit annoyed that the garage has thrown away my new sensor though as I was going to return it for a refund :/

jimbob9875

iTrader: (1)

grr