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No power to A/C compressor

Tiny
AMANDAG10304
  • MEMBER
  • 2008 NISSAN ALTIMA
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
Not getting power to the compressor from the IDCM. When I do the test (pushing the door button 10 times and it runs through the test on wipers, compressor clutch etc) it engages the clutch so I know that the relay is good. We have the system evacuated and refilled to correct pressure, new o-rings and system has no leaks, new pressure switch, new IDCM. Can't figure out why it's not getting power. Could it be the control inside the car? When we turn it on it blows hot air. Please help.
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Wednesday, August 4th, 2021 AT 2:54 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

First, you need to be sure you have freon in the system. You need at least 30-40 pounds for the ECM to ground the relay to turn on the system. You will need to check the system with gauges.

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

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

I attached the wiring diagram for you as well. I circled the fuse you need to view to be sure the relay has power.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

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

I also attached the location of the relay for you to view.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Roy
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Wednesday, August 4th, 2021 AT 3:12 AM

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