A/C Unit no power

1995 NISSAN TRUCK
90,000 MILES
Avatar
POORMAN
  • MEMBER
  • 5 POSTS
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.
Jun 25, 2012 at 9:22 PM
Advertisement
Avatar
SATURNTECH9
  • ✓ASE Certified Mechanic
  • 30,869 POSTS
  • ASE Certified Mechanic
The first thing you have to check is the ac pressures if there too high or low the ac compressor will be disabled.
Jun 25, 2012 at 9:26 PM
Avatar
POORMAN
  • MEMBER
  • 5 POSTS
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.
Jun 25, 2012 at 9:33 PM
Avatar
SATURNTECH9
  • ✓ASE Certified Mechanic
  • 30,869 POSTS
  • ASE Certified Mechanic
The pressure with the ac compressor off should be around 80-100 psi on the high and low side.
Jun 25, 2012 at 9:51 PM
Avatar
POORMAN
  • MEMBER
  • 5 POSTS
How do you turn down the AC compressor?
Aug 12, 2012 at 10:13 PM
Avatar
SATURNTECH9
  • ✓ASE Certified Mechanic
  • 30,869 POSTS
  • ASE Certified Mechanic
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?
Aug 12, 2012 at 10:36 PM
Avatar
POORMAN
  • MEMBER
  • 5 POSTS
I don't have a gauge for the high side, but the low side came out to be about 120 psi.
Aug 13, 2012 at 1:10 AM
Avatar
SATURNTECH9
  • ✓ASE Certified Mechanic
  • 30,869 POSTS
  • ASE Certified Mechanic
Thats enough pressure to let the compressor come on.Does the compressor come on?Also do you have a test light?
Aug 13, 2012 at 2:58 AM
Avatar
POORMAN
  • MEMBER
  • 5 POSTS
The compressor does not come on.
Aug 24, 2012 at 8:37 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.