A/C UNIT NO POWER

  • Tiny
  • Poorman
  • 1995 Nissan Truck
  • 90,000 miles

The A/C unit in my Nissan Pickup truck receives no power. When the A/C is turned on, there is no power to the compressor. What are the probable causes to this? Thank you.

Monday, June 25th, 2012 AT 9:22 PM

8 Answers

  • Tiny
  • saturntech9
  • Expert
  • 28,866 posts

The first thing you have to check is the ac pressures if there too high or low the ac compressor will be disabled.

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Monday, June 25th, 2012 AT 9:26 PM
  • Tiny
  • Poorman
  • Member

Hey saturntech9,
What would be a normal ac pressure? I'm not sure if the reading I am getting is too high or too low.

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Monday, June 25th, 2012 AT 9:33 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,866 posts

The pressure with the ac compressor off should be around 80-100 psi on the high and low side.

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Monday, June 25th, 2012 AT 9:51 PM
  • Tiny
  • Poorman
  • Member

How do you turn down the AC compressor?

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Sunday, August 12th, 2012 AT 10:13 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,866 posts

You dont turn the ac compressor down. You still havent told me what the ac pressures are on the high and low side with the ac compressor off?

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Sunday, August 12th, 2012 AT 10:36 PM
  • Tiny
  • Poorman
  • Member

I don't have a gauge for the high side, but the low side came out to be about 120 psi.

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Monday, August 13th, 2012 AT 1:10 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,866 posts

Thats enough pressure to let the compressor come on. Does the compressor come on?Also do you have a test light?

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Monday, August 13th, 2012 AT 2:58 AM
  • Tiny
  • Poorman
  • Member

The compressor does not come on.

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Friday, August 24th, 2012 AT 8:37 PM

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