Does Running My AC in the Summer Keep My Engine Cooler?

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When you engage your air conditioning in your car, it is usually summertime and hot outside. Air conditioning serves to remove heat from the inside of your vehicle by circulating a refrigerant through the evaporator core in your dashboard, and blowing the cooled air into the cabin with the blower motor. Many people believe that air conditioning also cools your engine when it is engaged but the opposite is true.

How air conditioning affects your engine

Air conditioning actually creates more engine heat in the engine compartment as there is more strain on the engine to operate the AC compressor. The engine’s serpentine belt drives the AC compressor, which requires more energy from the engine. You may actually notice a slight decrease in performance and fuel economy when the air conditioning is engaged.

When the AC is running, you’ll likely hear the engine fan running louder. Either the fan operates at a higher speed to combat the extra engine heat generated, or there may be a secondary air conditioning fan that runs to provide extra cooling. It is triggered by the cooling fan module or resistor to operate when the air conditioning is turned on.

If you notice the engine temperature climbing higher than normal when the air conditioning is turned on, it can be a sign of a problem with the cooling fan or the AC cooling fan. Have your car checked out if you experience higher than normal engine temperatures.


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Recent Cooling Fan Relay Replacement reviews

Excellent Rating


YourMechanic Cooling Fan Relay Replacement Service

Average Rating

4.7/5

Number of Reviews

33

Rating Summary
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Peter

42 years of experience
1301 reviews
Peter
42 years of experience
Chevrolet Silverado 1500 - Cooling Fan Relay - Phoenix, Arizona
Was very professional, punctual and is very knowledgeable. He did a great job working on my truck.
Jeep Grand Cherokee - Cooling Fan Relay - Surprise, Arizona
was pleased with my first experience with your company.

Patrick

32 years of experience
1123 reviews
Patrick
32 years of experience
Jeep Grand Cherokee - Cooling Fan Relay - Austin, Texas
Patrick is always knowledgeable and professional and never tries to charge me for anything I don't need. I have a nineteen year old Jeep that I love, and Patrick takes excellent care of her, and I trust him implicitly to keep her running smoothly! He's truly invaluable!

Ernesto

31 years of experience
28 reviews
Ernesto
31 years of experience
Toyota Highlander - Cooling Fan Relay - New Berlin, Wisconsin
Ernesto repaired my car in a timely fashion. He was knowledgeable, communicated what was going on with the car and has a pleasant personality. Thank you Ernesto!

Justin

15 years of experience
87 reviews
Justin
15 years of experience
Chevrolet Corvette - Cooling Fan Relay Replacement - Sacramento, California
Justin is very professional didn't waste any time diagnosing & fixing problems I recommend him & I will be looking forward to doing more business with him

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