Air Conditioning: low side too high. pressure switch? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 06-07-2012, 12:07 PM   #21
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I have the old compressor from my '02... the seals are bad, but besides that it worked fine when I removed it. You're welcome to it if you want.
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Old 06-07-2012, 12:58 PM   #22
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I may take you up on that offer. I can probably re-seal it or use the clutch if mine is bad.
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Old 06-07-2012, 01:05 PM   #23
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Quote:
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IF it is a bad pressure switch, that's a big pain in my ***.

and wallet.

unless someone wants to loan me some recovery equipment.
Dump that R134 into a bag and huff it.
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Old 06-07-2012, 01:24 PM   #24
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Quote:
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I may take you up on that offer. I can probably re-seal it or use the clutch if mine is bad.
Just let me know, I should be able to have it in the mail within a day or so. I am 99% sure I didn't throw it away.
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Old 06-07-2012, 05:21 PM   #25
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I just checked, I do have it, so it's yours for the cost of shipping, just say the word.
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Old 06-07-2012, 05:22 PM   #26
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the word is: grease
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Old 06-07-2012, 05:42 PM   #27
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Quote:
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I just checked, I do have it, so it's yours for the cost of shipping, just say the word.
actually, i'm curious if the pulley comes off easily. the FSM says some BS about a special service tool...

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the word is: grease
that word has groove and meaning.
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Old 06-08-2012, 10:19 AM   #28
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The pulley uses a tool similar to what you'd use for an angle grinder- easy enough to make or improvise. Just need to counter the unscrewing action.
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Old 06-08-2012, 11:08 AM   #29
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I've got a giant pair of channel lock pliers...
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Old 06-08-2012, 11:09 AM   #30
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Quote:
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I've got a giant pair of channel lock pliers...

and telepathic powers
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Old 06-09-2012, 08:34 PM   #31
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MOAR update:

mag clutch clearance is within spec. On the small side. I'm sure it's fine.

no fuses are blown. related to the AC system.

I have continuity from the relay output to the compressor clutch, so that's good.

I can provide 12V to the clutch and it kicks the AC on and the low side pressure immediately drops below 40, so that's also good.

But for some reason, the relay is not powering the clutch.

Which may SEEM like a simple bad relay (of the other 3 wires, 2 measure 12V and one GND) except that when I swap the relays for the condenser fan and the ac clutch, the AC stays off and the fan runs. Whichever relay is on the fan side, the fan runs and the AC does not run.

The current to the AC clutch is not particularly high. I forget the number but it had a lot of zeroes in front of it.

Brainy is bringing me a spare relay to test.

More ideas?
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Old 06-09-2012, 09:04 PM   #32
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Bad switch?
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Old 06-09-2012, 09:37 PM   #33
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you know, someone had an issue with AC working on their MS3.

I'm going to try updating firmware.
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Old 06-09-2012, 10:00 PM   #34
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pretty sure it's a ms3x firmware issue... My a/c stopped working back in Mar, thought it drained over the winter, but it just so happened I upgraded the firmware at the same time.

whoops.

Last edited by Braineack; 06-11-2012 at 09:46 AM.
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Old 06-11-2012, 08:11 AM   #35
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I pulled my AC so if you need parts let me know. And since I'm AC retarded, give me a pic of what you need and I'll rummage through the parts bin.
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Old 06-16-2012, 04:57 PM   #36
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megasquirt is not grounding the a/c output. derrrr.
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Old 06-17-2012, 05:18 PM   #37
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OK megasquirt IS grounding the output. Until I connect it to the car.

Verified this on two separate outputs.

What would cause that? Bad relay? Remember the same relay works fine with the fan (and output on the megasquirt controlling the fan).
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Old 06-20-2012, 10:50 PM   #38
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not sure what happened but I fixed it/it fixed itself.

went back to original wiring i had used but with a new TIP120 and it works. it didn't last time I tried it that way, but what do I know?
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