Strange PSI's in AC system, no cold AC

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Al9
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Re: Strange PSI's in AC system, no cold AC

Postby Al9 » Wed Jun 03, 2020 7:15 am

The ECU side of the clutch coil harness (the one coming from the engine harness) might be a little harder to find than the clutch kit.
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bohica2xo
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Re: Strange PSI's in AC system, no cold AC

Postby bohica2xo » Wed Jun 03, 2020 8:31 am

Or you could address the most common failure first.
pippo
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Re: Strange PSI's in AC system, no cold AC

Postby pippo » Wed Jun 03, 2020 11:51 am

bohica2xo wrote:Or you could address the most common failure first.


oK, I welcome quiz questions. Which is the clutch gap, right Bo?

Crawling under there in about 5 minutes.......
pippo
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Re: Strange PSI's in AC system, no cold AC

Postby pippo » Wed Jun 03, 2020 12:19 pm

bohica2xo wrote:Yeah Cusser, nobody wants to believe it is the clutch gap. Lots of compressors replaced for lack of an adjustment.

The hot resistance of the coil is greater than cold. Less magnetizing force hot. Add in some slightly higher resistance connections in the circuit... Quits working when it is hot.

Adjust the gap back down to .015 / .020 and it will work again.

Take a mirror & flashlight with you. When it craps out hot, leave it running, park & look under the car. Is the front plate spinning?


With a second look at this again, I get it now. easy test. Back outside with the mosquitos......
pippo
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Re: Strange PSI's in AC system, no cold AC

Postby pippo » Tue Jun 23, 2020 4:14 pm

I had to put off this project til now. Question: can one remove the ac clutch without removing the belt 1st? Ive done this to other cars (even camshaft pulley's) without disturbing the belt at all. I have the clutch removal kit from AZ. Is there too much pressure from belt to pull off /put back on the clutch and align the center bolt or should I have not too much of a struggle?

otherwise, I have to yank power steering pump/belt, alt belt, etc.......

Thanks, people.
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bohica2xo
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Re: Strange PSI's in AC system, no cold AC

Postby bohica2xo » Tue Jun 23, 2020 4:54 pm

The plate will come off without touching the belt. The plate floats on the compressor shaft, the pulley rides on a double row idler bearing pressed on the case of the compressor.
pippo
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Re: Strange PSI's in AC system, no cold AC

Postby pippo » Wed Jun 24, 2020 4:09 am

bohica2xo wrote:The plate will come off without touching the belt. The plate floats on the compressor shaft, the pulley rides on a double row idler bearing pressed on the case of the compressor.


Woahhh! This is such great news, Bo!! All of a sudden my job became so much easier! Thanks, Man!! (will report back)
Al9
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Re: Strange PSI's in AC system, no cold AC

Postby Al9 » Wed Jun 24, 2020 4:54 am

bohica2xo wrote:The plate floats on the compressor shaft

For the sake of completeness, i might add that whenever the coil is energized, a flexible element (such as a set of metal leaves, a set of metal pins or a rubber ring) flexes backwards with respect to the clutch hub and allows the actual friction disc to contact the pulley's friction surface. Not that immediate to understand, at least in my case.
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Cusser
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Re: Strange PSI's in AC system, no cold AC

Postby Cusser » Wed Jun 24, 2020 7:03 am

pippo wrote:
bohica2xo wrote:The plate will come off without touching the belt. The plate floats on the compressor shaft, the pulley rides on a double row idler bearing pressed on the case of the compressor.


Woahhh! This is such great news, Bo!! All of a sudden my job became so much easier! Thanks, Man!! (will report back)


On my 1998 Frontier, I left the belt on, and only removed the drive plate part of the AC clutch when I removed a shim to fix its slipping clutch.
pippo
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Re: Strange PSI's in AC system, no cold AC

Postby pippo » Wed Jun 24, 2020 3:31 pm

man, this is impossible- the tool I rented from AZ does not fit in the 3 holes/depressions on the clutch plate. They seem to be just a hair too big. I thought maybe the back ends of the 3 pins, which are much smaller diameter may do but they seem too small, and jiggle all over. Am I doing something wrong? That tool is quite awkward. never used one before, but one side pins are a tad big, other back end they are way small. Sheesh........

Sure, I can bring it back but I dont trust any other so called "clutch plate removal tool" anymore.........I wish i could measure the 3 holes on my plate.

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