fiveaces Posted October 2, 2017 Share Posted October 2, 2017 (edited) My Subaru 2.5 is over heating only when driving. I've bled the cooling system, replaced the thermostat, top and bottom hoses, radiator cap and flush the radiator but still over heat.Cooling fan are working. I let the car run sitting in the driveway for over a hour and it went to normal temp with fans running but didn't over heat at all but when I drove it for about 20 minutes it pushed the coolant into the overflow and temp went to the hot mark. Can anyone tell me what to do next. I also did a compression check which was normal range.... Edited October 2, 2017 by fiveaces Quote Link to comment Share on other sites More sharing options...
montana tom Posted October 2, 2017 Share Posted October 2, 2017 electric fans working ? If so your probably looking at head gaskets. 1 Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted October 2, 2017 Share Posted October 2, 2017 Definitely head gaskets. 1000%. GD 1 Quote Link to comment Share on other sites More sharing options...
fiveaces Posted October 2, 2017 Author Share Posted October 2, 2017 Thanks guys I'll do another compression check and go from there. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted October 2, 2017 Share Posted October 2, 2017 Compression test will show nothing. That's not how these gaskets fail. Waste of time. Replace the head gaskets. You don't need any further testing. GD Quote Link to comment Share on other sites More sharing options...
Stevo F Posted October 6, 2017 Share Posted October 6, 2017 All '96- '99 Subaru J25D engines will have headgasket failure (usually by 150K miles). We recently bought our '98 Legacy GT at only 94K miles and they already were replaced at 91K miles, so it can vary. Quote Link to comment Share on other sites More sharing options...
msmithmmx Posted October 7, 2017 Share Posted October 7, 2017 Coolant blowing into the overflow tank. 99% head gasket. 1 Quote Link to comment Share on other sites More sharing options...
wtdash Posted October 8, 2017 Share Posted October 8, 2017 (edited) ^ + bubbles and oily residue. HG, Edited October 8, 2017 by wtdash Quote Link to comment Share on other sites More sharing options...
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