As it says... our a/c light started blinking yesterday, no clutch, and we tested the high/low (without the a/c engaged) at 70psi, on both sides.

It blinked a few days ago, then went solid. Now, it won't stop blinking.

Thoughts, on what to go after first, when diagnosing?

Thx!

 

Can make the circuit try to start the a/c, by clicking the a/c button 4-5 times, off/on.
Engine idle's-up
Can hear a/c relay clicking.
a/c compressor clutch does not appear to be engaging.

Is the clutch ground the single wire? Going to measure if the a/c clutch is getting power, and if it is, can we hot-wire the clutch.

Ideas?

Thx.

 

Blinking AC light is usually a problem in the compressor circuit or the A/C control assembly.

3 wire connector on the AC compressor.
Light Blue w/ White tracer will be your Power (ac clutch engagement) wire. <-- should have power here when AC switch is turned ON.

The clutch is internally grounded.
Meaning the Compressor is grounded by it being bolted to the bracket.

 

Is there an easy place to apply +12v, to validate if the clutch will engage?

As the switch works, and I can over-ride by quick on-offs, and can hear the relay clicking when I do, fearing that if I validate +12v to the plug, and apply +12v to the clutch, I'll find out that the clutch is worn/bad. Oh, well, such is life...

 

Did you try to get the code by running the self diagnostic? I had the blinking light and after doing the test, it turned out to be I forgot to plug something back in after I changed my timing belt You'll have to look up how to do, cause I can't remember lol. I know you turn the key to the on position and hold two buttons for a few seconds and it will perform the test. Maybe the auto and recirculation buttons? Good luck

 

I did the timing belt weeks ago, and everything worked fine, been blowing cold air. A few days before, it blinked a few times, then stays solid, then one day after work it finally went full-blink.

I try to strictly control my changes, and there was no work in the engine bay during that time-window. I'll dig up the instructions, yet as the clutch doesn't appear to be engaging, and I can hear the relay clicking, I've resigned I'll be doing the compressor... yet as it's 20yo and 212k+ miles, maybe it's just time...? : )