Heater blower and AC issues

Tiny
PETER SIAMPOS
  • MEMBER
  • 2002 MAZDA 626
  • 2.0L
  • 4 CYL
  • AUTOMATIC
  • 161,000 MILES
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.
Tuesday, December 19th, 2017 AT 8:40 PM

6 Replies

Tiny
STEVE W.
  • MECHANIC
  • 12,934 POSTS
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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Tuesday, December 19th, 2017 AT 9:41 PM
Tiny
PETER SIAMPOS
  • MEMBER
  • 4 POSTS
Thank you very much, I will give it a try.
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Thursday, December 21st, 2017 AT 11:04 AM
Tiny
STEVE W.
  • MECHANIC
  • 12,934 POSTS
Have you had any luck finding the problem?
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Friday, December 22nd, 2017 AT 7:29 AM
Tiny
PETER SIAMPOS
  • MEMBER
  • 4 POSTS
I haven't checked it yet.
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Friday, December 22nd, 2017 AT 1:51 PM
Tiny
STEVE W.
  • MECHANIC
  • 12,934 POSTS
OK, just checking. Merry Christmas if I don't hear from you before then.
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Friday, December 22nd, 2017 AT 6:53 PM
Tiny
PETER SIAMPOS
  • MEMBER
  • 4 POSTS
Thank you very much, Merry Christmas to you/
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Saturday, December 23rd, 2017 AT 12:18 PM

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