Join Date: Jul 2012
Feedback Score: 0 reviews
Overheating On Highway
I’ve got a frustrating overheating problem that I haven’t been able to resolve yet…. Here are the details, any insight would be GREATLY appreciated!
2001 Outback 2.5. Recently replaced head gaskets, timing belt, water pump, thermostat, radiator cap, upper and lower hoses. Thermostat and radiator cap are both Subaru. Head gaskets were replaced because they were leaking oil. It runs fine except will run very hot at high RPMs, usually when driving on the highway. Can drive all day on back roads, no issues. When it’s heating up you can turn the heat on full and it will keep them temp at a reasonable level. Sometimes if you turn the heat off then back on a moment later, air is cool. Not freezing, not hot. When this happens, temp goes way up. Pull over, turn the engine off for 30 seconds – 1 minute, start back up, turn the heat on, it is ok and the temp stabilizes. No leaks, no smell that I’ve noticed. I did notice when its running at a high temp the overflow fills right up but doesn’t overflow, just close. One you are off the highway and the temp is back to normal you can drive all day, no issues.
Exhaust leaking into coolant? Blockage in the radiator? Too much water in system vs coolant in the system? Air? I have burped the system.
I was going to test for the exhaust leaking and clean off the radiator (just in case) this weekend.
Any other ideas?