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replaced compressor but it wont turn on
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Posted 9/8/2019 6:20 PM
mwhite308
Regular


Date registered: Aug 2015
Location: Birmingham, Alabama
Vehicle(s): Landrover LR3, 1984 Ferrari 308, 2003 MercedesG500
Posts: 65
50
replaced compressor but it wont turn on

I replaced the compressor on my 2003 g500. The old one would engage but the new one will not. Hard wire tested and the compressor works. Do I have to do something with the star system to make it engage again? Kind of like the TC module?
#240959
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Author
Posted 9/8/2019 7:15 PM
DUTCH
Administrator Doppelgänger




Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2000 G500 NMLE,2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9804
5000
RE: replaced compressor but it wont turn on

Is your R134a charged to the correct amount? There is a pressure switch in the system that will prevent the compressor from engaging if the pressure is too low or too high.
#240960 - in reply to #240959
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Posted 9/24/2019 3:44 PM
tgoode3
Member


Date registered: Apr 2014
Location: Charlotte, NC
Vehicle(s): Mercedes 2000 G500 (Europa)
Posts: 7

Re: replaced compressor but it wont turn on

Hi Dutch, Where would I find the proper pressure for a 2000 G500 Europa?
#241006 - in reply to #240959
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Author
Posted 9/24/2019 4:17 PM
DUTCH
Administrator Doppelgänger




Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2000 G500 NMLE,2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9804
5000
Re: replaced compressor but it wont turn on

tgoode3 - 9/24/2019 3:44 PM

Hi Dutch, Where would I find the proper pressure for a 2000 G500 Europa?


The only way that has ever worked for mew is to pull a hard vacuum for 30 minutes or so to clean out the old R-134a and any moisture. Then add exactly the amount of R-134a that is shown on the label. On my 2000 G500, that is 2.277 lbs. If you lost any oil in the process, I would guestimate how much was lost; and add it back with the refrigerant.

Doing it that way has always worked the best for me when servicing my A/C.
#241007 - in reply to #241006
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Author
Posted 9/25/2019 10:18 AM
tgoode3
Member


Date registered: Apr 2014
Location: Charlotte, NC
Vehicle(s): Mercedes 2000 G500 (Europa)
Posts: 7

Re: replaced compressor but it wont turn on

Thanks Dutch! It works great now!
#241011 - in reply to #240959
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