1997 A/C Not working! - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 06-29-2006
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1997 A/C Not working!

Not on my truck, but my friends 97, his A/C stopped working the other day. The compressor does NOT turn on; we checked every A/C fuse in the manual, along with every other fuse in the truck. All fuses are good and the compressor still does not work!
What are the other options on fixing this? Any help?! Please!
Shouldn't matter, but his truck is a 4.0L.
I searched on here for an answer but came up with nothing.
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Old 06-29-2006
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When you turn the climate controls to AC; there should be signal voltage going to the compressor clutch. IF not... you need to find the LPS (low pressure safety switch) and disconnect the connector. The LPS is a safety feature so that the compressor will not run when the systems refrigerant pressure is low which indicates a leak in the system. Measure resistance (ohms) across the terminals to see if there is continuity. If there is continuity and the compressor does not start; the coil energizing the clutch may not be functioning. If there is NO continuity.... then the system is LOW on refrigerant. To test this... Put a jumper wire in the the two terminals of the connector removed from the LPS and then turn the AC on... IF the compressor clutch engages.... this verifies the problem.

OR 4x4
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Old 06-29-2006
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If its on. Is it supposed to make a 'click' noise every 5 seconds?

My a/c in my 95 blows cold to cool air but for some reason everytime the compressor is on it clicks, spins then stops, every 5 seconds.

Is that an indication of a bad compressor?
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Old 06-29-2006
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what you need to do is check the freeon(sp?).....if the freeon is low it WILL NOT come on....it is a safety switch........

if it comes on and then stops and then repeats, you too have low freeon!
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Old 06-29-2006
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It doesn't turn on at all. And I know he said he recently refilled the coolant/freeon, I'll let him know, maybe he didn't put enough in.
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Old 06-29-2006
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if he just put in a little it may be completely empty....mine was and it took 2 18oz cans to get mine to fill up and come on...
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Old 06-29-2006
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My compressor would not turn on and it turned out to be a bad compressor clutch relay/switch. I know many other things can also cause that problem but I was told by the dealer that this is a fairly common problem.
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Old 06-29-2006
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YES...... A bad relay can certainly stop the compressor clutch from engaging.... The relay contacts can get pitted or corroded and the coil that pulls the contacts in can go bad over time....
Locate the relay, turn the climate controls to AC and check voltage at the relay. The should be a constant 12V source and a switch 12V source coming from the climate controls.... IF both are present when the climate control are set to AC and you still are not getting voltage to the compressor clutch, then the relay is more than likely the problem. IF you donot have the 12V switched power, then check the LPS as I previously posted.
Refrigerant is not hard to add to the system, but..... adding it in the correct amount requires a gauge manifold and at least one thermometer to see what the discharge air temperature is at the vents....
Most automobile systems even when empty; ONLY require about 1.5 lbs or refrigerant.
After 1993 most automobiles built use R 134a instead of the older R 12 which was phased out due to Global Warming and the depletion of the Ozone Layer.

OR 4x4
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Old 06-30-2006
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I tried a different relay on his truck that I took off of my truck to see if it was his relay, and nothing happened still.
We're going to fill up the refrigerant this weekend, he said he put only one small can in when he filled up a few weeks ago; and if it was/is empty, one small can will not be enough at all.
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Old 06-30-2006
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the best thing you can do is completely empty what is in the system. get 2 18oz cans and use them....make sure your filler hose has a gauge in it.....the system should hold 1 lb and 6 oz.......so get 2 18oz cans should allow for some leakage during install....
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Old 07-28-2006
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bringin this back up, i just bought some freeon for mine, and when i went to put it in, the level was just above recomemded, but i put a lil more in and bumper it to about 40psi, i think. But my compressor still goes crazy. Some im thinkin bad compressor. it comes on and then goes off real quick, and the air is semi cool, but thats not acceptable here in fla.

so my question is, what other vehicles/engines are the a/c compressors for our trucks compatible? ive got a 2.3L.
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Old 05-03-2013
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Quote:
Originally Posted by lifted97ranger View Post
the best thing you can do is completely empty what is in the system. get 2 18oz cans and use them....make sure your filler hose has a gauge in it.....the system should hold 1 lb and 6 oz.......so get 2 18oz cans should allow for some leakage during install....
HI, I JUST JOINED THIS FORUM. MY 96 RANGER 4CYL. HAS SAME A/C PROBLEM. COMPRESSOR CYCLING ON/OFF CONSTANTLY. YOU SUGGESTED TO TOTALLY EMPTY THE SYSTEM OF FREON THEN REFILL. CAN I DO THIS OR CAN A SHOP ONLY EMPTY THE SYSTEM. IF I CAN HOW DO I GO ABOUT IT ?
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Old 08-05-2016
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So I know this is my first post and that this is resurrecting a VERY old thread....but I am definitely in need of some help here.


I traced the wiring for my compressor and there is no power at the plug to the compressor. I jumped the LPS and I am getting a -13.98 or so on the multi meter. Andyone have any suggestions?
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