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  #1  
Old July 1st, 2018, 12:46
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88 Cherokee a/c line thing

1988 Cherokee 4.0. suction line has a bump in it. Is it a muffler? I have reason to believe what ever it is has gotten clogged as I'm frosting up on it. I just replaced my dryer and noticed this. Also there is some kind of valve thing that connects to the dryer does it also have a name?
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Old July 2nd, 2018, 05:42
JeepNoob JeepNoob is offline
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Re: 88 Cherokee a/c line thing

Got a pic? If it's on the low-pressure side, some condensation on it may be normal depending on the amount of humidity in your area.
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Old July 2nd, 2018, 05:54
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Re: 88 Cherokee a/c line thing

It's a muffler.
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Old July 2nd, 2018, 06:18
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Re: 88 Cherokee a/c line thing

https://photos.app.goo.gl/wAeVy4X9wvYmssA87

got a bit more than condensation. added a bit more r-152 and it melted away. high side was a smidgen higher than id like but it was about 95 with a 80% humidity.
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Old July 2nd, 2018, 07:21
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Re: 88 Cherokee a/c line thing

I took some closed cell foam and wrapped it, secured with tie wraps. The wrap extends beyond the metal fittings.

How's the 152 working for you?
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Old July 2nd, 2018, 08:01
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Re: 88 Cherokee a/c line thing

its been working great. did some adjusting to the evaporator temperature switch to cycle off at ~40 and back on at ~50.

but i got a hole in my condenser over the winter and after replacing that im having some issues. just slowly going through everything. i have a noisy compressor so i may swap in a 91+ compressor setup with r134 ports for ease of service.
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Old July 2nd, 2018, 09:54
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Re: 88 Cherokee a/c line thing

You'll need to go later than '92 - mine used R12 from the factory (been converted to 134 for something like 12 years now, though).
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Old July 4th, 2018, 07:00
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Re: 88 Cherokee a/c line thing

The ac brackets are different from Renix to HO. I think the '92 bracket will mount to the Renix block if you can source one.

When mine seized a while back, I looked at an "upgrade", rather than a conversion. After all the tradeoffs, decided to remain with year correct parts. At the time, although still more expensive, R-12 was easily acquired (yes, I'm 609 certified). I didn't care for the alternatives under SNAP at the time. I still have 2 cans of R-12 left.
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Old July 4th, 2018, 07:04
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Re: 88 Cherokee a/c line thing

Normally I would leave it period correct. But the compressor is starting to make noise while idleing.

There are a few at my local yard I could source brackets and parts. I might just go with a new compressor and hoses. Essentially replacing everything but the evaporator.

I also have 2 cans of R-12 and I just can't give them up or use them.
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Old July 4th, 2018, 19:50
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Re: 88 Cherokee a/c line thing

I'm looking to build a 90 with compressor, condenser, and lines from an 01.

Did you get a multi pass condenser or single pass like the original?
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Old July 4th, 2018, 19:53
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Re: 88 Cherokee a/c line thing

OEM Style looked like a single pass.
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Old July 4th, 2018, 20:08
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Re: 88 Cherokee a/c line thing

I look forward to trying the multi pass and see if it makes any difference.

Also, I seem to recall hearing somewhere that R12 hoses aren't perfectly compatible with R134a, that they leak down over time. I have one conversion going which I have to add a little to once a year, I wonder if that isn't it?
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Old July 5th, 2018, 08:02
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Re: 88 Cherokee a/c line thing

That doesn't ring a bell with me. The only time I've lost refrigerant in my 134-converted R12 system is when something truly failed (condensor rot, or rusted-out liquid line). No recollection of having leakdown.
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Old July 5th, 2018, 11:40
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Re: 88 Cherokee a/c line thing

R152a is awesome. So far so good on my conversion on another vehicle.

I'm not sure what the bump is, but IIRC R134a introduction was 94 or 95.

Also, did you flush the old mineral oil out and add ester oil while doing your R152a conversion? You need to - mineral oil won't flow with R152a, gotta use ester oil, and it might be why your compressor is making noise now. If you open the system to replace the compressor and see "black death" black gunk or silvery metal debris, it's time to flush everything extremely carefully and replace anything you can't flush.
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Old July 5th, 2018, 13:08
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Re: 88 Cherokee a/c line thing

Quote:
Originally Posted by kastein View Post
...replace anything you can't flush.
This should be read as remove dash, remove HVAC cabinet, and replace evaporator. Then change the accumulator/dryer. The original condenser is single pass and can be flushed.

This is why people complain about the price of a shop replacing a compressor that trashed. It includes all of the above or the shrapnel will eventually circulate to an inevitable physical disagreement with the new unit, resulting in another failure in short order.
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