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Vent Temps Unsatisfactory
I recently changed the expansion valve in the ol 420 sel and recharged with R-12 with three cans and the vent temps stay around 60 degrees when it's 76 outside with high humidity. I filled it up until full but still no change. This thing used to blow out 40 degrees at the vents no problem. What's the dealio?
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Why was this done? leak?
Did you replace the R/D? Did you pull a vacuum? 3 X 12 oz. cans = 36oz.. My 126 calls for 46.4 oz. Undercharged? 16 oz. cans? |
The expansion valve was leaking and the first attempt to fix it failed because I got lazy and only changed the o-rings on the lower lines and the drier. i finally bit the big one and changed the expansion valve and added a little oil and had the system vacuumed and I charged it with three 12oz cans and it resulted in terrible cooling. Then I bought another can of r-12 and filled it until no more bubbles in the sight glass and it resulted in no changes.
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Is the car moving when you are taking these temp readings? Or is it sitting in the driveway?
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I have similar problems with my W202 that already ran on R134 when it rolled off the factory. I can get almost no cooling if the car is at rest.... and only acceptable A/C when the car is on the freeway.... street is similar. When you stop the A/C is pretty much non-existent.....and if you switch on AC (leave ACC to auto and set a lower-than-ambient temp) and park your car for a bit the water temp goes up to 100C.... before the R134 recharge it would not do that.... but I was confirmed by other members that this was normal. I haven't driven the car in the really hot weather yet (never above 25C) so I don't know if the hot weather will make the A/C work better or worse. But if your car isn't moving yeah the A/C is definitely not too happy about it. |
Thats the problem. It cools ok at highway speeds but it is terrible at idle. It is still r-12 and always cooled down to 38-40 degrees no problemo. It struggles to get below 60.
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Aux fan running ???
Jumper this sw and see if fan comes ON http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=23I0RAMEE24118NOLA&year=1986&make=MB&model=420-SEL-001&category=R&part=A%2FC+Temp.+Switch |
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i know i have done an aux fan on the 260e
city driving an 90 degree temps are still a bit problamatic...but it will freeze you out on the highway |
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It is amazing how far along this Forum has come as far as DIYer a/c knowledge...I haven been here since day one, and I can remember when no one would even dare touch their a/c system [ or know anything about it]..so, the Forum has done well on a/c edumacating it's members in this highly specialized field...... There are reg guys here who now know more about their a/c systems than the guy they used to take it to. Gotta love it ........... |
I don't know about my knowing more than the guy I used to take it to, but it sure has helped me. Thanks again!
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I can remember when a/c was a new car thing.... our running joke when a guy would ask " "..uuum , What kinda' Gas do you put in there?? "
.....of course our answer was .."High-Test !! " |
Aux fan works because when i replaced the drier I bought the little red leads that everyone says go bad and it started working again. Should the expansion valve be hot on one side? I know the front of it gets hot and the back is cold.
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<<I bought the little red leads that everyone says go bad and it started working again. >
The red leads ? Are you talking about the sw with the pigtail leads ? Do you have gauge readings ? |
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