Why does my engine overheat with AC on?

On the interstate running 70 mph

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Rweber

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Posted on Feb 13, 2015

Rweber

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It's most likely a fan switch, the fan has multiple speeds and when the AC is turned on it should jump to the highest fan speed but if it's not working properly the fan will, in some cases shut off when it needs to be on

buzz flewhart

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Posted on Sep 06, 2014

buzz flewhart

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Does it only overheat on the highway? What about around town at lower speeds. Do the cooling fans kick in when it overheats?
What is the vehicle make/model? More information please...

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Why does the fan on my AC switch into defrost mode when I'm on the interstate rung about 70-75 mph? Does not happen around town

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Why does my engine overheat with AC on?

2 Answers

Rweber

buzz flewhart

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Why does the fan on my AC switch into defrost mode when I'm on the interstate rung about 70-75 mph? Does not happen around town

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1995 GMC SIERRA C1500 5.7L TBI RUNS SMOOTH BUT STARTS CHUGGING AT 70 MPH

I have a 2005 ford expedition and this morning while I was accelerating onto the interstate it started to sputter or **** between 60 and 70 mph. It stopped once I hit 70 mph but then my yellow engine...

Driving about 75 mph on interstate and all the sudden engine light comes on and monitor says reducing power to engine. Temp gauge skyrockets and cant drive over 30 mph...?!?!

Sometimes the engine will not start (hot or cold). Sometimes the engine quits while driving 70 MPH on the interstate. Have new distr cap, roter, plug wires, plugs, fuel filter. (1999 astro van 4.3L)Any...

Driving down interstate at 70 mph car suddenly

I have a 1997 Ford F150 4.6L with an overdrive light that will steadily blink ''off'' during interstate driving (70 mph +). The rpms and speed never change. It will stop blinking when I turn off the engine...

Bad milage

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Why does the fan on my AC switch into defrost mode when I'm on the interstate rung about 70-75 mph? Does not happen around town

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Related Topics:

Why does my engine overheat with AC on?

2 Answers

Rweber

buzz flewhart

Add Your Answer

Attachments: Added items

Related Questions:

Why does the fan on my AC switch into defrost mode when I'm on the interstate rung about 70-75 mph? Does not happen around town

1994 Chrysler Lebaron Convertible In traffic with

2000 honda accord 5 speed rpm rev at 70 mph

1995 GMC SIERRA C1500 5.7L TBI RUNS SMOOTH BUT STARTS CHUGGING AT 70 MPH

I have a 2005 ford expedition and this morning while I was accelerating onto the interstate it started to sputter or **** between 60 and 70 mph. It stopped once I hit 70 mph but then my yellow engine...

Driving about 75 mph on interstate and all the sudden engine light comes on and monitor says reducing power to engine. Temp gauge skyrockets and cant drive over 30 mph...?!?!

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Driving down interstate at 70 mph car suddenly

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Bad milage

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Why does the fan on my AC switch into defrost mode when I'm on the interstate rung about 70-75 mph? Does not happen around town

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