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#1
10-02-2010, 09:19 AM
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A/C stops blowing cold at traffic lights
Hi Everyone,
This'll be an easy one for you all! The air conditioning in our '85 300CD blows nice and cold when trundling down the interstate, but when we're stopped at a traffic light, the air starts to get warm and humid. Needless to say this poses a problem when trying to use the air conditioning around town - especially this past summer and our current indian summer up here in New England! If I sit in the car, parked, in Park or Neutral, with the air con running, same problem. But if I toe the accelerator and bring'er up to about 1500rpm, the a/c starts blowing nice and cold again. Methinks it's some type of "high-idle" needed for good a/c when stopped that our car currently lacks. What say you? Thanks in advance!! J
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Cantabridgian ------------------------------------------------------------ 1987 300TD Black/Palomino 120k on donor engine (thank you CS), 305k on everything else MISSED 1985 300CD Blue/Palomino 250k lovely but had to part with it; now wife has Jetta TDI, you know how it goes 
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#2
10-02-2010, 09:59 AM
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Check your Aux. fan. Is it running after idling for long periods? Check the fuse first and go from there.
You can jumper the wires over at the temp. switch (by the drier) to see if the fan itself is operable.
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AJ 1985 300D (SOLD) 
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#3
10-02-2010, 11:16 AM
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Quote:
Start with the Aux fan and go from there.
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'95 E300D ("Tank") - 231,000 miles '79 240D ("Biscuit") - 197,250 miles (Sold) '83 240D ("Ding-Ding") - 217,000 miles (Death by deer) ______________________________________ "Back off, man. I’m a scientist” ~ Peter Venkman
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#4
10-02-2010, 01:02 PM
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I would check the compressor's clutch out... I had the same problem on my 85 300D, and it turned out that the clutch would only engage at higher RPM's...all it needed was an adjustment. My mechanic had some special tool he used...sorry I don't know what it's called. He explained it to me as wear had caused the clearance on the magnetic clutch to widen.
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Current cars: 2000 ML55 AMG, 174k miles 2003 C240 T-Modell, 202k miles 1995 S320, 207k Miles
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#5
10-03-2010, 09:34 AM
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both great suggestions!!! will run them down and report back. thanks, folks......
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Cantabridgian ------------------------------------------------------------ 1987 300TD Black/Palomino 120k on donor engine (thank you CS), 305k on everything else MISSED 1985 300CD Blue/Palomino 250k lovely but had to part with it; now wife has Jetta TDI, you know how it goes
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#6
10-03-2010, 10:15 AM
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A/C? Winter is upon us! It is currently 38F outside here.
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-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#7
10-03-2010, 10:57 AM
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heh, east coast is still warmed by the atlantic coastal currents... we gots a few more weeks of A/C needs!
anyhoo, 134 conversions don't have the liquid capacity to maintain cooling at idle speeds. also, if your condenser has dirt/bug buildup, you will get the conditions you show. have the condenser CHEMICALLY cleaned with condenser coil chemical, and you should see a marked improvement in the cooling ability.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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