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#1
10-25-2012, 09:23 PM
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87 300D A/C compresson only on for 10 sec..
start the car, pressures good, turn on the air, compressor runs for 10 seconds, and cuts out. charge is low, so I'm adding refrigerant as it runs, but it will not come back on. I bypassed the lps, no change, only way to get the compressor back on is to lift fuse 7 and then drop it back. then it runs for another 10 seconds... very annoying.
what's causing it?
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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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! 
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#2
10-25-2012, 11:35 PM
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The Klima relay.
It senses the rpm of the compressor and compares it to engine rpm. If there is a discrepancy it shuts down the compressor and it will not start again until the Klima is power cycled. It does this to save the belt if the compressor is dragging. When the compressor is started it waits 10 seconds to start the comparison. If it is not satisfied at the end of 10 seconds it shuts down. I think I know where you might know where to find a replacement compressor tach sensor...
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech
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#3
10-26-2012, 06:59 AM
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grr...
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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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#4
10-26-2012, 07:28 PM
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You need to dx the L7 and L3 sensors.
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http://i284.photobucket.com/albums/l...aman/Fleet.jpg Peach Parts W124.128 User Group. 80 280SL 85 300SD 87 300TD 92 300D 2.5 Turbo 92 300TE 4Matic
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#5
10-26-2012, 07:33 PM
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Quote:
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 Did you just pass my 740 at 200 kmh in a 300SD?????1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership 
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