04-14-2020, 04:20 PM | #1 |
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A/C compressor woes
Last year, I installed a new compressor on my 1990 Suburban. Cooling output was greatly reduced from the previous one. So today, I installed a new parallel flow condenser. I vacuum out the system and was in the process of recharging the system. Just about the time as cool air was starting to come out of the vents, I heard something squeaking and within about a minute the noise got louder and finally, the compressor locked up. What's going on here?
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1990 ¾ ton 4x4 Chevy Suburban -Cummins Diesel - 12 valve - factory rebuilt -6 speed bullet proof manual transmission - NV5600 -Gear Vendors Overdrive - HX35 Holset Turbo -NP205 iron transfer case -3.73 gears -2" Lift |
04-14-2020, 04:59 PM | #2 |
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Re: A/C compressor woes
Was it sitting for a few months. clutch seized or pulley or bearing check try to free see if it spin free, If not time to change to part or the compressor complete.
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1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change. |
04-14-2020, 06:33 PM | #3 |
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Re: A/C compressor woes
Nope, I have been using the A/C regularly and used it as recently as a few days ago. The clutch runs free but the compressor is completely locked.
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1990 ¾ ton 4x4 Chevy Suburban -Cummins Diesel - 12 valve - factory rebuilt -6 speed bullet proof manual transmission - NV5600 -Gear Vendors Overdrive - HX35 Holset Turbo -NP205 iron transfer case -3.73 gears -2" Lift |
04-15-2020, 08:23 AM | #4 |
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Re: A/C compressor woes
Maybe oil mixture was off in the recharge. I don't know though, that was the only thing that comes to mind.
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04-15-2020, 08:36 AM | #5 |
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Re: A/C compressor woes
Ok well.Last year you replace the compressor did you replace the O rings seals. If you did maybe check to see if the where leaking there maybe bad seal.If there bad seal maybe why. Or just a bad compressor.
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1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change. |
04-15-2020, 08:58 AM | #6 |
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Re: A/C compressor woes
Make sure you have good air flow through condenser. I had similar issue a few years ago. Not enough air flow and the pressure goes up causing compressor to lock up.
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04-15-2020, 06:12 PM | #7 |
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Re: A/C compressor woes
I'm getting a new compressor shipped out to me on warranty!! This is one of those times that spending the extra $80 for a lifetime warranty is paying off handsomely.
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04-16-2020, 02:50 AM | #8 |
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Re: A/C compressor woes
In my experience rebuilt/reman compressors are junk, even with the lifetime warranty. Recommend you fork the extra cost for a new Delco unit or you will be replacing it again soon. Not to long ago took back a lifetime warranty compressor and got a full refund. Even though I do the evacuation and recharge myself. Did not want to risk it. That was actually the second time it happened to me. The cost of refrigerant and time is not worth it. I am suspect of the new parts as well. Maybe manufacturing will return to USA in the future and hopefully quality will get better.
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04-16-2020, 06:26 PM | #9 |
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Re: A/C compressor woes
also change your orfice tube
What does the AC orifice tube do? An orifice tube has no moving parts and contains a permanent restriction within the system. The orifice tube systems control the refrigerant flow through other means, such as cycling the compressor on and off, or the use of a refrigerant regulating valve within the compressor itself.Sep 20, 2016 |
04-18-2020, 11:29 AM | #10 |
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Re: A/C compressor woes
what compressor are you running? it was probably low on oil.
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04-18-2020, 07:05 PM | #11 |
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Re: A/C compressor woes
I'm running a compressor out of a 1990 Dodge Ram. I also suspect that the old compressor died of oil starvation. When I removed it from the truck, I tried to drain the oil out of the old compressor and there was none. There was just a little bit in the old accumulator. Wonder where all of the oil went?
The new compressor came prefilled with 6.5 oz of oil. The system takes a total of 11 oz. I hope that 6.5 oz of oil that the new compressor came prefilled with is enough.
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1990 ¾ ton 4x4 Chevy Suburban -Cummins Diesel - 12 valve - factory rebuilt -6 speed bullet proof manual transmission - NV5600 -Gear Vendors Overdrive - HX35 Holset Turbo -NP205 iron transfer case -3.73 gears -2" Lift |
04-18-2020, 07:26 PM | #12 |
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Re: A/C compressor woes
This is what I was told and have read, that always drain the compressor of whatever oil it was shipped with, then add the recommended amount of the proper oil for the type system. I forget what the two main types of oil there is at the moment.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
04-18-2020, 08:08 PM | #13 |
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Re: A/C compressor woes
Ester and Pag (46,100,150)
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04-18-2020, 08:13 PM | #14 | |
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Re: A/C compressor woes
Quote:
The reason that I changed out the evaporator is because the previous pump cooling output was absolutely pathetic even with the correct amount of charge. And then when I was recharging it, it took forever to draw in the freon. I must have ran it for 45 minutes and maybe there wasn't enough oil circulating throughout the system due to undercharge. I decided to take my chances and recharge the system. It's blowing cold air now.
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1990 ¾ ton 4x4 Chevy Suburban -Cummins Diesel - 12 valve - factory rebuilt -6 speed bullet proof manual transmission - NV5600 -Gear Vendors Overdrive - HX35 Holset Turbo -NP205 iron transfer case -3.73 gears -2" Lift Last edited by Edahall; 04-18-2020 at 08:53 PM. |
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04-18-2020, 10:39 PM | #15 |
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Re: A/C compressor woes
I run a 94 dodge compressor on mine. I think I have 7oz of oil in my system, it takes 3lb 14 oz of 134 to charge it. I run a ford expansion valve(slightly smaller orfice) in it and it will freeze you out.
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88 military v30 crewcab shortbed 5.9 cummins, nv4500, 205 86 k30, 89 diesel burb, 76 gmc pathfinder 71 longbed 5.3 4l80 http://67-72chevytrucks.com/vboard/s...d.php?t=522535 |
04-19-2020, 05:47 PM | #16 |
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Re: A/C compressor woes
Ran this new compressor today and it feels much colder than the previous one.
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04-19-2020, 06:22 PM | #17 |
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Re: A/C compressor woes
From what I understand, there has to be enough charge for oil to circulate through the system. If that is true, what keeps a pump lubricated when the system is being re-charged?
When I was re-charging the system after replacing the condenser, the compressor was sucking in the freon slower than molasses. I was about 45 minutes into it when the pump locked up. When I removed the pump, it was bone dry! Since then, I have installed a new pump and cooling performance is much improved. |
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