Replaced air conditioning compressor and it doesn't work

1999 FORD F-250

253,000 MILES • 5.4L • V8 • 2WD • AUTOMATIC

BRENDA HENDRY CROUCH

MEMBER
2 POSTS
FOLLOW

Our AC air compressor went out and we bought a replacement. Switched out the compressors, refilled the Freon (R whatever is the stuff) and let it cycle. The new compressor started to switch on and off, the it stopped running. It is not seized, just not running. Checked the fuse box to check the fuse and there is no fuse in the number five slot for it, but it has been running prior to the compressor going out. Question is, where else would the fuse be? Went through the Haynes manual, and cannot find a solution. Can you help us please?

May 6, 2017 at 1:10 PM

STEVE W.

CERTIFIED EXPERT
15,113 POSTS

What happened to the original compressor? Have you tested the low and high pressure switches? How much R134A did you add to the system? Is it still showing pressure?
If you apply twelve volts to the clutch does it engage then?

May 6, 2017 at 1:38 PM

BRENDA HENDRY CROUCH

MEMBER
2 POSTS

Old compressor was original to the truck and it seized up. Yes to all. Some one told us to look at the back plug, the two prong plug and move it around. If no response to add a piece of copper wire to it. We are looking for copper wire right now.

May 6, 2017 at 2:03 PM

STRAILER

CERTIFIED EXPERT
53,854 POSTS

Hello,

There is a WOT relay that could have failed on you. Or you have too much refrigerant in the system.

Here is a guide to help you get the problem fixed.

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

and

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

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Too help you test the wiring on the diagrams (BELOW)

Please run some tests and get back to us so we can continue helping you.

Cheers, Ken

Images (Click to enlarge)

May 8, 2017 at 5:49 PM