PeachParts Mercedes-Benz Forum - View Single Post

dmorrison · #13 06-16-2005, 03:32 PM

boneheaddoctor

Well the system was not over charged. Gauge pressures were normal and the system was running fine since I installed it a year ago last spring. If anything I think I may have had a small leak. Vent temps rising when at a light. They rose about 10 degrees. That is why I was setting up the aux fan to run continuously. That is how I ran it last summer. It helped the system condense the freon vapor. This brings us into the idea of a second receiver/dryer for liquid storage and vent temps remaining high at lights, but that is another post!!

leathermang

Actually I'm just hoping its not black death!!!

Yes the manual does warn about replacing the manifold hose

http://img.eautopartscatalog.com/live/R102011584ACM.JPG

if the compressor is replaced "owing to blocking". Again the previous system did not fail. That does not mean that debris was not in the old manifold hose. I did however flush it quite extensively.
When I flushed the manifold hose I used about 1/2 gallon of mineral spirits and then about a quart of AC flush. I used a under coating gun which I had modified for my sons Mustang . I had attached a long flexible hose to the tip and was able to insert the tip about 16 inches into the manifold hose. I was convinced this was a very complete flush. Maybe not.

Opening the system will tell all.

Dave

edited for boneheaddoctors post.

Thinking about the system pressure, not a overcharge, it may be true that the pressures were high. Last year I ran the car with the aux fan operating whenever the car was on. This brings the pressures down while operating with R134a. This year I had not installed the switch jump wire in the receiver/dryer line so I may have been running excessive pressures on the high side. I'll have to think about this some more.