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A/C, cooling fans and compressor not working

Tiny
SNAKEBITN
  • MEMBER
  • 1994 CADILLAC FLEETWOOD
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 85,000 MILES
Here is what I have: A/C compressor, cooling fans hi and low speed inoperable. Pulled vacuum, compressor turned on for half can, then quit, fans never came on. I have no power to the fans. All fuses are good. Replaced compressor relay. Found a broken wire. Still no A/C?
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Monday, August 12th, 2019 AT 1:28 PM

7 Replies

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

What wire was broken?

1/2 can is not enough. You need to add as much as it will take. Remove the negative battery cable and reinstall and then try the A/C system again.

Roy
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Monday, August 12th, 2019 AT 5:34 PM
Tiny
SNAKEBITN
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  • 4 POSTS
The wire was the A/C compressor relay in the under hood fuse box with the 2 /40 amp fuses, they are good. I replaced the relay with AC Delco one. I was closing up the shop moving the car around I heard the A/C compressor kick on. I put the rest of the can in and the compressor quit again. Cooling fans never came on. The orifice had a lot of gunk on it so I replaced it earlier in the day.
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Monday, August 12th, 2019 AT 6:15 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Once the compressor stays engaged the high side pressure builds, the AC fan should come on. It sounds like you do not have enough freon in the system. Thats why it is shutting off.

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

Can you give me the high and low side readings of the system?

Roy
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Tuesday, August 13th, 2019 AT 2:38 AM
Tiny
SNAKEBITN
  • MEMBER
  • 4 POSTS
Static pressure reading is 100 on both sides. When the compressor did come it dropped to 35 took the half can. The compressor cycled then pegged out the low side 300 psi. I am thinking compressor is gone out.
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Tuesday, August 13th, 2019 AT 5:02 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay, yes, if the low side spiked to 100, then yes, it sounds like you have something going on.

I would replace the compressor, dryer, expansion valve and make sure the condenser is clear.

Roy
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Tuesday, August 13th, 2019 AT 6:41 AM
Tiny
SNAKEBITN
  • MEMBER
  • 4 POSTS
Hey, I did all that yesterday charged the system took quite awhile. Still no cooling fans coming on. Low side kept building too much Psi cause no fans coming on. Another suggestions replacement of the fans next.
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Friday, August 16th, 2019 AT 5:48 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did you clear out the condenser? With 100 lbs. On the low side, you have a blockage somewhere.

Roy
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Friday, August 16th, 2019 AT 1:46 PM

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