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| A/C issues. "Tight" compressor. Belt slipping. (Page 1/4) |
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Raydar
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SEP 02, 11:11 AM
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The car is an 88 GT. Doesn't matter how tight I get the A/C belt, it slips and squeals. I can re-tighten the belt, and it's okay for a few minutes, and then starts squealing again. (The adjustment is not slipping.)
The belt has been replaced. The one that came on the car broke.
With the engine off, I can turn the compressor fairly easily by hand, just by grabbing the clutch.
Long story short, it seems like the compressors is dragging, or having a difficult time turning, under power. It does not try to stall the engine, however.
Full disclosure... I had to remove the HVAC airbox to clean out the ductwork, heater, and evap core.
I was planning to let the refrigerant escape slowly, so as to retain all the oil. (Yeah... I know.) But instead, the schrader valve blew out and coated the entire right side of the compartment with A/C oil. Lots of it.
It gets better. The car had an R134A low side fitting, but the high side still had the R12 fitting, with no R134A adapter. So... what refrigerant was in it was in question. If it had been converted, what oil was even in it?
I decided to replace my "lost" oil with Ester oil, since that's supposed to be compatible with PAG and mineral oil. I figured that I had likely vented most of what was in the receiver dryer, since that's where the schrader came from. So I added ~2 oz. (This might be where I messed up.)
I vacuumed the system down, and it held just fine, so I entered the required amount of R134A; ~36 oz., and called it a day.
I should add that the A/C will run you out of the car. It cools better than the A/C in any of my other cars.
So... why does my compressor "drag"? Have I possibly got too much oil in the system? I haven't looked at high side pressure yet, but low side seems to be fine.
As I said, it seems to work fine, and cycles fine, other than the dragging.
Thanks![This message has been edited by Raydar (edited 09-02-2023).]
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jelly2m8
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SEP 02, 03:13 PM
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Raydar, did the belt squeal before the Airbox work and recharge?
About the R134A fitting on the low side and not on the high, I ran into this issue where the high side adapter would not seal so we left that off and charged it Via the Low side port.
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sdgdf
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SEP 02, 04:45 PM
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| quote | Originally posted by Raydar:
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Looks like ChatGPT showed up to the thread to help you 
That's real sketchy it doesn't show the url/destination when I hover over that link.[This message has been edited by sdgdf (edited 09-02-2023).]
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sdgdf
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SEP 02, 05:17 PM
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This bot has shown up on multiple threads, it looks like its trying to inject malicious code:
<span id="SHOWHIDDEN84984" class="HTMLBodyLink" style="cursor  ointer;" onclick="document.getElementById('HIDDEN84984').style.display='';document.getElementById('SHOWHIDDEN84984').style.display='none'"><!-- HIDE_CAPTIONSTART -->Click to see AI response<!-- HIDE_CAPTIONEND --></span>
Cliff needs to delete its posts.
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Raydar
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SEP 02, 05:41 PM
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| quote | Originally posted by sdgdf:
This bot has shown up on multiple threads, it looks like its trying to inject malicious code:
...
Cliff needs to delete its posts. |
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I checked the announcements. This is a "Cliff" thing.
It's supposed to answer questions, but all I've seen so far is it quoting verbatim, with slightly different spacing of phrases.
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Raydar
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SEP 02, 05:46 PM
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| quote | Originally posted by jelly2m8:
Raydar, did the belt squeal before the Airbox work and recharge?
About the R134A fitting on the low side and not on the high, I ran into this issue where the high side adapter would not seal so we left that off and charged it Via the Low side port. |
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I'm not sure. Soon after buying the car, I realized that it had a white mold problem, due to a minor leak in the sunroof.
The first order of the day was to gut the interior, Including all the ductwork, and decontaminate everything. I didn't want to take any chances on it coming back.
Good info on the fittings. But even if the car had been converted to R134, I still probably needed to use Ester oil, I'm thinking. I couldn't assume that everything had been disassembled and flushed.
Thanks for your input.
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RWDPLZ
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SEP 02, 07:18 PM
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"Click to see AI response"
THEY TOOK MY JERB!
Check the air gap on the clutch coil, and make sure the two metal surfaces are clean, the air gap should be ~0.020".
Considering you had mystery oil (in terms of quantity and type) in before and added Ester oil, there is likely too much oil in the system. Most of it is probably going to settle in the compressor, accumulator, and under-car lines. If you can remove and drain those, then add 8oz of PAG or Ester, that would be ideal to make sure it's closer to spec.
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Raydar
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SEP 02, 09:29 PM
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| quote | Originally posted by RWDPLZ:
"Click to see AI response"
THEY TOOK MY JERB!
Check the air gap on the clutch coil, and make sure the two metal surfaces are clean, the air gap should be ~0.020".
...
there is likely too much oil in the system. Most of it is probably going to settle in the compressor, accumulator, and under-car lines. If you can remove and drain those, then add 8oz of PAG or Ester, that would be ideal to make sure it's closer to spec. |
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Doesn't some "live" in the condensor and evaporator, too? If I thought I could successfully drain it all without disassembling everything, I'd do it in a hot minute. I didn't think it was that easy.
I've got an air compressor. Maybe I could blow everything out. I was thinking that, since I added ~2 oz., maybe I could just remove *almost* 2 oz.
Thanks![This message has been edited by Raydar (edited 09-02-2023).]
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RWDPLZ
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SEP 02, 11:19 PM
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| quote | Originally posted by Raydar:
Doesn't some "live" in the condensor and evaporator, too?
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Yes, but not as much as the others. You could drain and flush the whole thing to be sure, but some small amount of residual oil is fine.
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I was thinking that, since I added ~2 oz., maybe I could just remove *almost* 2 oz.
Thanks!
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This assumes the system had the proper amount to begin with (and wasn't R-12 525 viscosity mineral oil). The fact you pressed the schrader valve and it sprayed 2oz of oil everywhere would seem to suggest there's a LOT of oil in there.
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jelly2m8
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SEP 03, 06:31 AM
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| quote | Originally posted by RWDPLZ:
This assumes the system had the proper amount to begin with (and wasn't R-12 525 viscosity mineral oil). The fact you pressed the schrader valve and it sprayed 2oz of oil everywhere would seem to suggest there's a LOT of oil in there. |
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Shouldn't a good long vacuum evacuate the majority of the oil? say 20 mins under 30 or more inches of vacuum . I do respect your knowledge, just asking an honest inquiry.
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