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#1
07-11-2011, 05:23 PM
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Warm AC when still, cold AC when moving. What gives?
83 SD AC is warmish when the car is not moving. Nice and cold when moving! The aux fan is on. Anyone tried upgrading the aux fan? My problem is obviously air flow. Anyone had any problems with the aux fan? It doesn't seem to move a whole lot of air. I tried cleaning/washing it....made no difference..
Any ideas??
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1983 300SD.....169,000 miles but quit counting a few owners and unknown years ago! 
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#2
07-11-2011, 05:25 PM
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R134A or R12?
Have you put gauges on the system?
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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#3
07-11-2011, 05:40 PM
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How long has the situation been going on ?
Was this sudden or slow to develop ?
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html
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#6
07-11-2011, 07:05 PM
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There have been a few other threads with SD's saying the compressor is cutting out. Maybe not an airflow problem, but a compressor relay-engine RPM problem?
Does the compressor stay engaged at idle?
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#7
07-11-2011, 07:09 PM
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This is the second OP in the last week that posts a question... stays on the site long enough for several people to ask legit questions trying to help..
Then goes offline without answering the questions... At the time I posted he was still online... I even PM'd him when I saw that he was online and had not answered 79Mercy's question yet...
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html
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#8
07-11-2011, 07:45 PM
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Quote:
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#9
07-11-2011, 07:47 PM
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Quote:
__________________
1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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#10
07-11-2011, 07:57 PM
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How's your fan clutch?
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#11
07-11-2011, 08:22 PM
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Quote:
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html
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#12
07-11-2011, 10:20 PM
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I've only owned one MB with working AC. That is/was the 123 I resurrected/SOLD last summer.
We own the Suburban (how hard is it to get good HVAC from a GM rig?) and two non-functioning MB systems. C'est la vie . . . my burden to bear.
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James Marriott 2003 Buick Regal 1983 300D (228k, frau Auto) 1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000) www.engineeringworks.biz 1987 300SDL junker 170k 1982 300SD junker, 265k
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#13
07-12-2011, 01:20 AM
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everybody needs to understand, a moving vehicle while under a larger heat load due to airflow over the chassis, RPM of the compressor is a HUGE a/c difference than at idle/low RPM...
__________________
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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#14
07-12-2011, 09:03 AM
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Quote:
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html
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#15
07-12-2011, 09:35 AM
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Quote:
the OP is describing exactly the issue with a mobile a/c system. what I meant is that even though the air moving over the car makes for a larger heat load on the a/c system, the higher RPM of the compressor more than makes up for it, and provides much better cooling. improving condenser airflow can make some difference at idle, but NOTHING beats RPM for improved cooling from the system.
__________________
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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