Heater blower and AC issues

2002 MAZDA 626
161,000 MILES • 2.0L • 4 CYL • AUTOMATIC
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PETER SIAMPOS
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The AC compressor should turn on when the AC switch is turned on and the blower switch is in any position except off.
In mine, the AC compressor turns on with the AC switch in the off position everytime the blower switch is moved to any position except off.
Any advice would be greatly appreciated.
Dec 19, 2017 at 8:40 PM
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STEVE W.
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It will also turn on if you have defrost selected with the AC switch off. That is so the system can dry the air and prevent interior icing.
If you do not have defrost selected and the AC is off but the AC compressor is still turning on then my first item to check would be at the AC clutch relay. It receives power through the same fuse as the wipers. If you remove that fuse and the compressor stays engaged the relay is stuck closed. If however pulling the fuse shuts it off, your issue then is either in the switch itself or in the wiring. This is the only schematic showing that system.
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Dec 19, 2017 at 9:41 PM
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PETER SIAMPOS
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Thank you very much, I will give it a try.
Dec 21, 2017 at 11:04 AM
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STEVE W.
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Have you had any luck finding the problem?
Dec 22, 2017 at 7:29 AM
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PETER SIAMPOS
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I haven't checked it yet.
Dec 22, 2017 at 1:51 PM
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STEVE W.
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OK, just checking. Merry Christmas if I don't hear from you before then.
Dec 22, 2017 at 6:53 PM
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PETER SIAMPOS
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Thank you very much, Merry Christmas to you/
Dec 23, 2017 at 12:18 PM