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

10

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

10

Someone Please help

1 out of 1 people think this is helpful.
18,170

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

1 out of 1 people think this is helpful.
880

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.

5 out of 5 people think this is helpful.
18,170

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 out of 2 people think this is helpful.

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