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Q: 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
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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!
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
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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
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