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Murray Auto AC Compressor
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jellis56
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Apr 1, 2021, 3:40 PM
Post #1 of 12
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Murray Auto AC Compressor
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I am installing a Murray AC Compressor in my 2014 Silverado 1500. I have two questions I could use help with.
1. There is a screw in plug with a sticker on top that covers a tiny hole that goes through the plug. I took it out and verified the hole doesn't go straight thru, it's baffled or something to prevent oil from escaping.
I can't find any info on what this is for and it is not for the low or high lines into the compressor. It almost looks like a breathing hole of some type.
2. What is the best method of adding new PAG 46 oil after dumping out the factory oil? Do I pour it in the low side port and rotate the clutch several times or a better method?
Thanks
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Hammer Time
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Apr 1, 2021, 4:58 PM
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Re: Murray Auto AC Compressor
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That is an oil fill plug.
Not knowing what sort of failure it was or which components you are changing, I can't give you much advice.
I can give you this basic and important info
If this compressor had an internal, mechanical failure, then you absolutely should be changing the condenser also or you could lose the new compressor.
You also was to use new only on the compressor. NEVER remanufactured.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jellis56
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Apr 1, 2021, 7:44 PM
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Re: Murray Auto AC Compressor
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I know there is a oil drain plug, but this is different, not the same. There's a foil sticker over the top of the bolt head and if you pull that off there is a little hole in the center. I have tried to pour Pag in the hole after unscrewing the plug (which has the little hole in the center) it and it doesn't drain into the compressor.
(This post was edited by jellis56 on Apr 1, 2021, 7:47 PM)
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Hammer Time
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Apr 1, 2021, 7:47 PM
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Re: Murray Auto AC Compressor
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You're going to have to show us a picture.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jellis56
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Apr 2, 2021, 8:03 AM
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Re: Murray Auto AC Compressor
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I found out from a GM Tech in another forum, it is the following:
HPRV otherwise known as High Pressure Relief Valve. It is a safety valve to release refrigerant if indeed the HPCO High Pressure Cut-Off switch does not shut off compressor.
This is a new compressor from Murray, sold by Oreilly's Auto Parts. Absolutely no instructions come with it. At the store they have info on what Pag oil and amount and how much R134A goes in it, but thats all.
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Hammer Time
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Apr 2, 2021, 8:07 AM
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Re: Murray Auto AC Compressor
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That's why I asked for a picture. A blow off valve would have been readily recognizable. They are usually installed on the end of the compressor, not the top.
The amount of PAG oil you need is totally dependent on the amount removed through components removed and flushing. The original capacity spec has nothing to do with it when making a repair.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Apr 2, 2021, 8:10 AM)
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Tom Greenleaf
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Apr 2, 2021, 9:17 AM
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Re: Murray Auto AC Compressor
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The oil should already be in it, most are properly filled as said by Murray just now.
If that's the GM Tech by user name I knew him for years! He should know.
Hammer Time just mentioned oil and it's going to be about what happened that you are there at all. How much was lost is an educated guess or you keep going and add system's capacity spread throughout as you can.
Also mentioned is condenser or ends your warranty or always used to and driers.
If you picked this up at a that chain store for goodness sake call or go ask what the deal is or who from Murray it may not be exact original to this truck - many are not. OE new vs what you have hope you saved your core till this is done to compare notes and see just how well it really fits??
Store should have given you contact info just about the compressor not a course in automotive A/C when something fails how you approach it,
T
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jellis56
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Apr 2, 2021, 10:56 AM
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Re: Murray Auto AC Compressor
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Bought the truck in Jan 21. It was 16 degrees outside, had no way of knowing the AC was toast. As is sale. Last week it got warm out and I discovered AC wasn't working. Leaked out from the infamous condensor spot weld area. I replaced the condensor with a beefed up one made by Pacific ? off Amazon. I decided to throw a new compressor at it as well, got 97k miles on it. I did a flush on the evaporator and replaced the expansion valve too.
thank you for all of the advice. I think I have the questions worked out and gotten my answers.
I do have one more request for help-answers.
I have installed the compressor and it's holding a vacuum. It's currently 37 degrees F outside and I don't have a heated garage. I don't believe the weather is warm enough to attempt to properly charge the system, correct? In order so I can use the vehicle until it warms up some, which might be a few days according to the weather report.
I'd like to know your recommendations for what to do after I'm done the vacuuming the system? Should I precharge the high side with upside down can or just enough vapor from the upright can on the low side-until the 30Hpg goes to 0?
In case anyone is wondering why I'm messing with the AC in April with 30+ degrees weather, well, it was 72 last week and I am planning on making a trip down south in the next few weeks.
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Hammer Time
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Apr 2, 2021, 11:40 AM
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Re: Murray Auto AC Compressor
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You are correct. You can't do much of anything in those temperatures. The refrigerant will not act correctly. You need to get it at least over 60 degrees.
When it comes time to charge it, dump the first can in without starting the engine. When it stops flowing, start it up and finish the charging. The cooler it is outside, the harder it will be to charge because the pressures will be too low. Heating the refrigerant can will help in charging.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Apr 2, 2021, 11:41 AM)
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jellis56
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Apr 2, 2021, 11:47 AM
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Re: Murray Auto AC Compressor
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addressing what I need to do right now, should I just leave the vacuum on the system and drive it until it gets warm outside again or let some air back in and drive it until time to charge?
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Hammer Time
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Apr 2, 2021, 11:51 AM
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Re: Murray Auto AC Compressor
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I would leave the vacuum on it. The air will have moisture in it.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
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Apr 2, 2021, 11:55 AM
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Re: Murray Auto AC Compressor
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Just this part of charging:
1. Vacuum that holds full vacuum for at least 30 minutes. It yours allow over an hour.
2. When ready (guessing on your equipment) if this has a high side port use a second something to add till gauges read anything positive pressure on low side - means zero air got in.
Same weather I deal with too early so far to know A/C is right and know it can blow the right, expected temp of air out center vent(s.)
Buying in January YOU took the risk OR could have tried to get in writing A/C works properly on a 5 year old IMO this is early for temperate areas.
You'd think off season they wouldn't fail they do from busted condensers, snow with chips, rocks in sand or the highway even rock salt can be too big and a weapon to cars/trucks. You see those as oil stains right thru the grille on condensers.
That then can be slow and killed your compressor it comes on if you request anything but full off for MVAC (Motor Vehicle A/C)
You can't with electric fans on most I leave now ancient stuff unplugged off season just plug back in on a freak warm enough day to let oil circulate.
Cross fingers but still have two vehicles (my own) with OE A/C one just 25 another 32 years old! No parts or fixes since new! Some boosts - yes not suggested you try that crap.
This isn't a game on your wallet I'm sure you're finding out. Do something all wrong wreck it in a mile and start all over again.
Best if your area is cooperative is to seriously weigh in charge can do with a good scale account for hose hook ups.
AYOR it's a pest and risky DIY really wish you luck. Stop and find out if and when something isn't going right.
Do know holding a vacuum is only holding OUT about 14.7 PSI or atmospheric pressure not holding pressures up and well over 200 PSI of a gas so it just gives you the go ahead,
Tom
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