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Air Conditioner not working?

Tiny
DRRADKIN
  • MEMBER
  • 4 POSTS
Hi, I put my (cheap) set of gauges on the system and am posting the pictures from the readings.

Low Side: +17 (I hope the makes sense)


https://www.2carpros.com/forum/automotive_pictures/575763_HPIM8401_1.jpg



High Side: +56.25


https://www.2carpros.com/forum/automotive_pictures/575763_HPIM8402_1.jpg



Any thoughts on the pressure?
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Monday, December 7th, 2020 AT 4:32 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Neither, That is not an open/close switch. It's a 3 wire, 5v reference that delivers a specific return voltage that translates to a specific pressure.
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Monday, December 7th, 2020 AT 4:32 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Low should be @ 35psi high needs to be @200psi. Readings indicate low charge. Green is a dye placed in system to help ID leaks with use of black light.
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Monday, December 7th, 2020 AT 4:32 PM (Merged)
Tiny
MIKEUPLANDER
  • MEMBER
  • 10 POSTS
Surely its designed to turn off the fans if the switch opens?
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Monday, December 7th, 2020 AT 4:32 PM (Merged)
Tiny
DRRADKIN
  • MEMBER
  • 4 POSTS
I gave you the outer reading on my gauge (marked 134A) the inside marks are PSI. The High side is 210psi and low side is about 60psi. I think I figured out the problem though. It started working after I took the box around the heater core apart. I think that it isn't always directing the air around the heater when I turn the dial to the cold setting.
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Monday, December 7th, 2020 AT 4:32 PM (Merged)
Tiny
MIKEUPLANDER
  • MEMBER
  • 10 POSTS
I vacuumed down and recharged the system which fixed the AC and fan operation! Thank you so much for your help.
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Monday, December 7th, 2020 AT 4:32 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Yes blend door will cause low side to go up and not cool
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Monday, December 7th, 2020 AT 4:32 PM (Merged)
Tiny
MIKEUPLANDER
  • MEMBER
  • 10 POSTS
Problem was fixed, high pressure switch was bad, switch location is between the radiator and front of the engine. It's about 6-8 inches from the AC compressor.
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Monday, December 7th, 2020 AT 4:32 PM (Merged)

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