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I have a 2007 Honda Accord Euro all of a sudden now loses coolant whenever I use the aircon. When I drive with the aircon off, the level remains fixed but soon as I drive 20min with ac I realise the overflow reservoir is way below minimum. I can smell coolant when I open the bonnet but I cant see where it could be leaking.

I asked one mechanic and he said there is no relation between losing coolant and running ac. Any ideas what the issue could be?

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  • The only link I can think of would be the A/C compressor drive system shares the serpentine belt with the water pump. Perhaps your water pump is failing and the different loading when the A/C is on is causing it to leak. I'd focus on finding where the coolant is going and that will likely lead you to the root problem.
    – jwh20
    Mar 29 at 12:10
  • Strange, if you turn the heating on with the AC compressor off does it still leak?
    – GdD
    Mar 29 at 16:18
  • Took it to Honda they didnt do much, just flushed the system and put new coolant. Didnt have a problem since then
    – West
    Jun 30 at 7:11

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