Skip the auto shop - Our mechanics make house calls

Q: My car only overheats when ac is on?

asked by on

My Lincoln Town car only over heats when the ac is on

My car has 395000 miles.
My car has an automatic transmission.

If you have overheating only when you have the A/C on then you most likely have a bad fan clutch. The fan clutch should lock up when the added heat from the A/C is added from the condenser to the radiator.

You should check for any blockage of the fins on the radiator or condenser. Also check the radiator for lack of coolant flow through some of the internal passages using a laser pointer type temperature probe to see if the radiator has hot and cold fins indicating partial blockage. You should try to flush out the radiator and replace the fan clutch.

If you decide to get this serviced, consider YourMechanic, as a certified professional can diagnose your overheating issue and help you make the necessary repairs. Good luck.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: AC not blowing cold air

Hi. There are many different possibilities here. Most A/C systems stop working due to switches in the system failing or a bad clutch on the compressor. You may have also just overcharged you’re A/C system or have a Freon leak....

Q: Issues with EVAP system

It is very possible you may have a vacuum leak causing a rough idle and too much air on acceleration causing sputtering and rough running issues. A smoke check of the induction system would be a good idea. Reading the...

Q: Engine shakes and plug wires when checked with timing light look something like Morse code

Hi there. I would still be suspicious of the coil packs. If you have access to an oscilloscope, I would look for pulses off the crankshaft and camshaft sensors. If sensor pulses are even, change the coil packs. If the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...