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#1
06-16-2007, 04:18 PM
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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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1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual 
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#2
06-16-2007, 05:50 PM
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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 Golden Rule 1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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#3
06-17-2007, 02:08 AM
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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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1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual
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#5
06-17-2007, 12:49 PM
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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.
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#6
06-17-2007, 08:37 PM
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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.
__________________
1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual
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#7
06-17-2007, 08:53 PM
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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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#8
06-17-2007, 09:59 PM
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Quote:
 Arthur, you're getting quite a work-out on the aux fans this year!
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2012 E350 2006 Callaway SC560
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#9
06-17-2007, 10:35 PM
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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
__________________
1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k  1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC]
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#10
06-18-2007, 06:54 AM
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Quote:
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 ...........
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#11
06-18-2007, 07:59 AM
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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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1993 400E, 256,000 miles (totaled) 1994 E420, 200,000+ miles 1995 E420, 201,000 miles
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#12
06-18-2007, 08:09 AM
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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 !! "
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#13
06-18-2007, 08:10 AM
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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.
__________________
1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual
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#14
06-18-2007, 08:30 AM
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<
The red leads ? Are you talking about the sw with the pigtail leads ? Do you have gauge readings ?
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#15
06-18-2007, 08:55 AM
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Quote:
__________________
1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual
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