Why does my car try to run hot when the AC is on?The thermostat has been changed and I have coolant.If I go 70mil per hr it runs just fine.it runs hot whenever it's not in motion and AC is on


Asked by Jul 28, 2015 at 07:32 PM about the 2002 Honda Accord EX

Question type: Maintenance & Repair

The temperature hand goes up like it's
running hot when AC is on...turn it off, the
hand goes bck to normal...The coolant
never boils over...

4 Answers


Someone Please help

1 of 1 people found this helpful.

Are the radiator fans coming on when you turn on your A.C. ?

1 of 1 people found this helpful.

The water pump impeller is going bad. The water pump uses the same belt than the AC and therefore the RPM on the impeller has less traction. Less traction equal less movement of the collant thru the engine.. I will suspect that you should replace the water pump. The coolant needs to run at a certain speed in order to maintain a constant temperature in the engine. Piece of advise: if water pump is replaced, change in the same time the serpentine belt.

6 of 6 people found this helpful.

I would try cleaning the radiator and A.C condenser coil with a garden hose and nozzle or better yet a pressure washer. If the fans are coming on and starts to over heat just idling and drive and it and its good the radiator and condenser coil maybe partially clogged with dirt and bugs restricting air across the fins that maybe why it stops over heating when you drive because air is being forced through fins. Tortoine maybe right it maybe the water pump but I would try to clean the radiator and condenser coil fins first it is cheaper and worth a try.

2 of 2 people found this helpful.

Your Answer


Looking for a Used Accord in your area?

CarGurus has 60,155 nationwide Accord listings starting at $1,099.


Honda Accord Experts

  • #1
    Tom Demyan
  • #2
  • #3
    Jonathan Ford
View All

Related Models For Sale

Used Toyota Camry
940 Great Deals out of 82,535 listings starting at $999
Used Honda Civic
787 Great Deals out of 70,038 listings starting at $1,500
Used Honda Accord Coupe
148 Great Deals out of 8,350 listings starting at $1,450
Used Nissan Altima
1,023 Great Deals out of 78,794 listings starting at $1,695
Used Toyota Corolla
811 Great Deals out of 55,173 listings starting at $1,500
Used Honda CR-V
769 Great Deals out of 57,946 listings starting at $1,850
Used Nissan Maxima
260 Great Deals out of 23,019 listings starting at $1,400
Used Acura TL
148 Great Deals out of 4,444 listings starting at $1,995
Used Hyundai Sonata
744 Great Deals out of 50,911 listings starting at $1,995
Used BMW 3 Series
1,115 Great Deals out of 33,829 listings starting at $1,000
Used Kia Optima
399 Great Deals out of 30,433 listings starting at $1,900
Used Ford Mustang
596 Great Deals out of 36,389 listings starting at $899
Used Chevrolet Malibu
980 Great Deals out of 65,631 listings starting at $1,000

Used Cars For Sale

2016 Honda Accord EX For Sale
5 Great Deals out of 181 listings starting at $14,995
2015 Honda Accord EX For Sale
17 Great Deals out of 583 listings starting at $12,595
2014 Honda Accord EX For Sale
43 Great Deals out of 887 listings starting at $9,995
2013 Honda Accord EX For Sale
6 Great Deals out of 213 listings starting at $9,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.