I have an impreza hawkeye sti remapped to 360bhp. Over the 3or4 months my car overheats occasionally and cool air comes out of the interior air vents I have had the thermostat replaced,had a littmens test for a head gasket but they all come back clear so has anyone got any ideas??

 

sounds like an air lock mate

 

I have tried different things to get rid of the air lock. I left the cap off the radiator and expansion tank and ran it for about 25mins that was about two month ago is there anything else I can try??

 

I have read many times on here only way to get rid of air lock is to totally drain and start again but has to be done a special way. have a search been covered many time

 

Ok thanks. It's really annoying I want it sorting. Goin to see if there is anything on you tube but will probably take it to a garage next week.

 

https://www.scoobynet.com/general-te...hlight=Coolant

 

Follow this thread.

As I said, no reliable way to bleed the system, so do it right: slow and steady.

 

i've read all kinds of wifes tales , like park it on a hill etc lol,

 

What gets me is when I bother to write out how to do it, then the OP says, "Yeah, I think I'll try burping it..."