david, did you ever find out what was wrong?? 99 Outback Wagon 2.5L, and i have exactly!!!EXACTLY! the same symptoms of overheating at stops when engine is good and warm, and then the temp going down with high rpm's... i have replaced the waterpump, cleaned the radiator, new radiator cap and thermostat....i am about to have the head gaskets done even though a compression test shows nothing...please let me know what you found out thanks david
Make sure your fans are coming on when the engine gets hot.
David Ya that sounds exactly like my problem. My current guess is that it's a bubble in the cooling system at low revs this bubble is siting over the temperature sensor so the heat is gathering on the sensor. When you rev the bubble is moved and water again gets to the sensor quickly cooling it down.
The problem seems to have stoped in my car which could be because its getting cooler here in Australia or I am using the heater and have moved my bubble to the heater coil as I now hear bubbles in my heater coil if I drive with the heater on and no radio
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