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After a new temp.sensor, water pump, radiator, thermostat also new radiator cap....- i read online about a restriction-or blocking in heater core. i had heat. flushed heater core from both ends-1 pipe then the other...now it is fine-runs 195-215 degrees variance none of the 'pros' could get it. the answer lies in the forums...like this one. i was so pleased. i spent $400 ++ dollars and still worried about overheating. had no blown head gasket symptoms( white smoke in exhaust ,beige oil color, pressure coming back into overflow tank. even put a mini-camera into cylinders to see if they -or just 1 was clean- from a steam cleaning by way of hot water steaming inside cylinder. Radiator- new and old were cool...not the way it should be. i urged the mechanic to check flow in all different areas of system for restriction. i have also read egr valve- this will usually trip a code-check engine lite. anyway- mechanic seemed unwilling to start looking on answer boards-like these for future problems...he can cost folks a lot of wasted money. i saved the day and my daughters' car!
Ps. the cooling fan comes on at 220 approx. degrees - if I recall what I read - I read a lot. BE WARY OF FOLKS THAT IMMEDIATELY SAY"BLOWN HEAD GASKET". I HAVE DESCRIBED THE HEAD GASKET SYMPTOMS EARLIER IN MY ANSWER... keep googling the problem in different wording- the answers change almost each time i went back into Q/A forums... don't rush to pay a 'guru' $15 for an answer....that seems so petty....we can help each other based on real world situations that come to a resolution- good or bad. mine was good thanks to sites like this...and i did not have to join-donate-give my wife's measurements, etc.
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