ScoobyMonty Posted December 24, 2020 Share Posted December 24, 2020 Hi All, I really need some advice?! I have a 2006 Impreza STi. The cabin heater is blowing cold air, which is a nightmare bearing in mind that it's rained every day for the last 18,000 days... I have burped the radiator, thrice, by running the engine with the rad cap off and topping up with coolant. After I do this the heating works and blows hot air, for a short period then goes back to cold. There was a tiny amount of gunk on the rad cap and a tiny amount of oily type gunk that floated out of the rad, which could indicate a head gasket issue, however, the car is not burning oil and the oil does not have any impurities. And the head gasket was changed 4 years ago... And the coolant has been clear and free from gunk since.. Any advice? Quote Link to comment Share on other sites More sharing options...
Tidgy Posted December 24, 2020 Share Posted December 24, 2020 Sounds indeed like might be headgasket. Doesnt always burn oil, depends which part of the gaskets gone. I suggest you get it to a specialist and get them to take a look. Quote Link to comment Share on other sites More sharing options...
savage bulldogs Posted December 27, 2020 Share Posted December 27, 2020 Scoobies tend to push combustion gasses into the coolant if a headgasket goes,i don't think I've ever seen one mix coolant and oil before (like most other engines do ) The usual sign is after using boost the coolant will bubble and spit out of the expansion bottle, due to combustion gasses squeezing past the h.g and pressurising the coolant system. When you burp the coolant and it works ok do you have to top up the coolant or just burp it ? If you have to top it up evertime , it's either burning or leaking coolant . So check for tell tale "furry coolant coloured " bits around the coolant system in the bay (to indicate leaking) Or whip the spark plugs out and check their colour , as you should be able to tell if its excessively burning coolant by their colour too . Failing that get a garage to do a sniff test for combustion gasses in the coolant. If theres some in there its definitely a headgasket issue unfortunately Quote Link to comment Share on other sites More sharing options...
Siluro Posted December 31, 2020 Share Posted December 31, 2020 You said rad cap, should bleed from the Filler tank cap not rad cap. Bleed from highest point. Quote Link to comment Share on other sites More sharing options...
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