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MB Paul
MB Paul, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3567
Experience:  Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes
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AC had a leak in the high pressure hose. R&R that hose,

Customer Question

AC had a leak in the high pressure hose. R&R that hose, replaced A/C drier, and O rings at condenser, and one side of the expansion valve where leak was indicated. Vacuumed down, refilled with 24 oz (system calls for 26.5) and some oil (estimated amount since compressor was not replaced). AC works (cold air) and then once and a while stops working. Pressures are 50/325 at 105 degrees outside. With AC turned off low side pressure builds to 90, High side drops to 225. Since it is intermittent expansion valve? At 80 degrees outside it seems like all works all the time- don't know for sure since it is only 80 degrees for a few hours.
JA: When was your last oil change?
Customer: 200 miles ago
JA: What is the model/year of your Mercedes?
Customer: 2003 ml350 (w163)
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: see message
JA: Anything else you think the mechanic should know?
Customer: not at this point
Submitted: 1 year ago.
Category: Mercedes
Expert:  Lou P. master tech replied 1 year ago.

Hello, my name is***** and i will do my best to assist you.I am going over your story now and will reply back soon with some info,thanks!

Expert:  Lou P. master tech replied 1 year ago.

ok is this with the setting all the way on cold? at the lowest point?

also does the low side ever get below 50psi?