A/C R-134a Refrigerant Charging
Thread Starter
Super Member
Joined: Mar 2006
Posts: 771
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From: Waikele, Oahu, Hawaii
2011 GLK350 P1, Multi-media & AMG Pkg; 2010 E350 w/ prem 2; 2018 4Runner SR5 Prem. 4x4
A/C R-134a Refrigerant Charging
Hi everyone,
Can someone tell me which is the LOW valve on the W163? Unfortunately, MB does not label the valve caps with "L" or "H"....unlike other makes.
My guess is the valve next to the driver-side headlights (behind the front grill) is the LOW "L".......and the other valve is near the pass-side coolant (fronting the firewall) is the HIGH "H".
Am I correct?
Thanks in advance.
Pete
Can someone tell me which is the LOW valve on the W163? Unfortunately, MB does not label the valve caps with "L" or "H"....unlike other makes.
My guess is the valve next to the driver-side headlights (behind the front grill) is the LOW "L".......and the other valve is near the pass-side coolant (fronting the firewall) is the HIGH "H".
Am I correct?
Thanks in advance.
Pete
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Joined: May 2005
Posts: 2,825
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From: New Jersey
things with and without wheels
How much experience do you have with a/c ?
Depends on the location of the service ports is enough information to know which is the high or low pressure side.Also the fittings are different size .
Depends on the location of the service ports is enough information to know which is the high or low pressure side.Also the fittings are different size .
Thread Starter
Super Member
Joined: Mar 2006
Posts: 771
Likes: 7
From: Waikele, Oahu, Hawaii
2011 GLK350 P1, Multi-media & AMG Pkg; 2010 E350 w/ prem 2; 2018 4Runner SR5 Prem. 4x4
Originally Posted by RobertG
Look at the diameter of the a/c lines , the larger diameter line is the low side .
Thread Starter
Super Member
Joined: Mar 2006
Posts: 771
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From: Waikele, Oahu, Hawaii
2011 GLK350 P1, Multi-media & AMG Pkg; 2010 E350 w/ prem 2; 2018 4Runner SR5 Prem. 4x4
Originally Posted by RobertG
How much experience do you have with a/c ?
Depends on the location of the service ports is enough information to know which is the high or low pressure side.Also the fittings are different size .
Depends on the location of the service ports is enough information to know which is the high or low pressure side.Also the fittings are different size .
Member
Joined: Jan 2003
Posts: 152
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From: Chesapeake, Virginia
'11 C300
Normally, the low or suction side will be cold to the touch also - unless you're way low or out of freon. Then you have a leak somewhere that is going to have to be fixed. If you don't purge some freon through the line you're using to charge the system with first - with the system not running - you will suck air into the system with the result being contaminated freon and an inefficient cooling system. Since you've done this before you probably already knew that.
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From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
https://mbworld.org/forums/m-class-w164-72/
But here are the locations of the low and high side charging ports on a W163, and they could be similar.
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