Over heating when turning A/C on Highway on 1999 Ford Expedition

Flushed Twice, New coolant, New pump, New thermostat 192', New Fan cluch, overheats when A/C is turned on the Highway but not in City traffic What can be the cause of this

by in El Paso, TX on August 11, 2013
2 answers 3 comments
ANSWER by on August 12, 2013
Turn A/C off and the engine runs cooler at hwy speed? And it works fine in town with A/C on? That's bass ackwards! I'm going to guess, radiator restricted or air in cooling system. Who knows? No fan needed at hwy speed!
COMMENT by on August 12, 2013
Well that's what I thought heating up on hwy if A/C is turned on runs fine and does not heat up in city stop and go it runs fine
ANSWER by on August 12, 2013
poss fan clutch is bad. easy to test while eng is running watch fan and have someone turn off eng, fan should stop in about 3-5 seconds.if its goes past that its most likely bad
COMMENT by on August 14, 2013
Found the problem, it was the Radiator being Clogged up Thanks for all the Help
COMMENT by on August 14, 2013
Glad you found it. Your reply may help others with similar trouble.

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