1999 Ford Expedition Q&A

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

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 -
Answer 1
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 1
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 2
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 1
Found the problem, it was the Radiator being Clogged up Thanks for all the Help -
Comment 2
Glad you found it. Your reply may help others with similar trouble. -