Problem: Air conditioner starts working while its switch is off

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BDay - 26 Sep 2005 21:19 GMT

Hi there,

I've just bought a secondhand 2000 Mazda 626 Lx in very good
condition except for one odd problem: when I try to select the
Defroster Air Flow mode (air towards the windshield) the air
conditioner starts working by it-self, even if it's switch is off.

Any suggestion?

Best regards.

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KENG - 26 Sep 2005 21:35 GMT

Normal operation. When you uyse the defroster, you do so for one of two
reasons. 1. You have ice or frost on the windshield. 2. You have FOG or
condensation on the inside of the windshield. The A/C is used to
dehumidify the air blown on the windshield, to remove the fog. This is
typical, and I have no direct knowledge of your Mazda.
KenG

> Hi there,
>
[quoted text clipped - 6 lines]
>
> Best regards.

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Bruce Chang - 26 Sep 2005 21:48 GMT

> Hi there,
>
[quoted text clipped - 6 lines]
>
> Best regards.

If you're defrosting, removing the humidity from the passenger compartment
increases the ability of the defroster to do its work. It does this by
design.

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Steve - 26 Sep 2005 21:49 GMT

> Hi there,
>
[quoted text clipped - 6 lines]
>
> Best regards.

Most cars turn on the AC compressor any time "defrost" is selected.
Helps to de-humidify the air and clear the fog quicker.

Of course the A/C won't run if the air coming into the evaporator is
below freezing.

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