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#1
06-16-2007, 05:18 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, 06:50 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, 03:08 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, 01:49 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, 09:37 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, 11:35 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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#8
06-18-2007, 07:47 PM
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The valves made today are all compatible with both freeze 12 and 134 as well as r12 they will interchange,most companies are reducing the amount of tooling, by making things more interchangeable.
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