1993 A/C Not Working

[art1029]

1993 2.3, MT
A/C just started to not work. Converted the truck over from R12 to R134 a few years ago. I recently added some Freon since it was low. Worked great, kept the truck nice and cold.

Tested power from the battery to the clutch, clutch engages.
Tested the ohms at the clutch, reads a 2. I saw online it should be between 2-5.
Swapped the relays in the exterior fuse box and no change.
Checked the interior fuses and no blown fuses.
A/C light comes the climate control when I push the button in.
Used a test light and the connection has power.

Thoughts?

 

[97RangerXLT]

You are probably low on refrigerant again.

When you converted it to 134, did you replace the hoses? 134 has smaller molecules than 12 and will basically slowly leak through the walls of the hoses. But that should happen over a few seasons... not weeks or months.

Double check all connections and front seal of the compressor for leaks.

Also if it worked and all of a sudden does not, check the pressure switch/ transducer (located on the accumulator) it should be real cheap at a junkyard and maybe 25 new online. No real way to test it with a meter other than if you have more than 40psi in the system it should work. You can replace it without draining the refrigerant

AJ

 

[lil_Blue_Ford]

Yup, check the pressure in the system and check for leaks. If the pressure is good, pull the plug off the pressure sensor and put a jumper across the terminals, if the clutch activates, the pressure sensor is bad.