A/C not working

Tiny
BRANDON24
  • MEMBER
  • 2005 KIA SPECTRA
  • 4 CYL
  • 2WD
  • MANUAL
  • 78,000 MILES
I have a problem with my A/C, The A/C compressor is not getting voltage. When I select the switch for A/C the compressor will not turn on. I know the air duct door is working correctly to choose heat or cold.I have checked with a multimeter for power at the compresser, one lead on ground and the other on the plug, I have checked the triple pressure switch and am not getting power to either of them with A/C selected. I know I have freon in the system. The A/C belt is tight and in good condition. I have checked all the a/c fuses. I have checked the A/C relays and swapped them with same relays. When I jump the A/C control relay with a jumper wire the compressor turns on and the a/c blows cold.I checked for voltage at the A/C control relay and at 85 and 30 terminals there is voltage. Terminal 86 and 87 does not have voltage. It seems like the relay is not getting a power signal when the A/C button is pressed/turned on. Do you think the A/C control switch assembly is bad? On the control switch when you select A/C the button still lights up as if it were working. What are other possible causes of the A/C not working.
Monday, January 18th, 2010 AT 7:35 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
It sounds like you may not have enough freon in the system I would go over this guide first.

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

This guide can help as well.

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

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Monday, January 18th, 2010 AT 7:43 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,356 POSTS
The compressor relay is controlled by the ECM and there are a few components in between,, here is a wiring diagram to get you started. The controller do go out on these cars though. There is a guide to help you test.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Thursday, August 11th, 2016 AT 12:09 PM
Tiny
BROBENAVIDEZ
  • MEMBER
  • 2 POSTS
Hey, I was wondering where you got that diagram from? I cant see it, it is super blurry.
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Thursday, October 24th, 2019 AT 2:44 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,356 POSTS
Yes, I updated the post check the diagrams again please. Let me know if you need anything else to fix the problem. We are happy to help.
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Saturday, October 26th, 2019 AT 1:38 PM

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