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#1
10-28-2012, 07:22 AM
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w123 heat issue
In my 1983 300cd i either have full heat or nothing. The blower speeds work perfect, the air comes out where it should but right when you click it off "min" the air coming out gets really hot and it does not matter where the wheel is. A/C works great btw. Is there a problem with the monovalve or the temp sending unit thing on the dash? I should not be complaining because i have both heat and a/c but i have to use my windows as a temp mixing device haha
 any suggestions are much appreciated!
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#2
10-28-2012, 08:08 AM
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it sounds like not all your vent positions are working. the heat flap should regulate your temp. it could also be the temp wheel, they are known to fail. pulling the ccu, and resoldering the wheel may solve the issue.
__________________
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
10-28-2012, 10:39 AM
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Remove the glove compartment and check that the aspiration tube to the temperature sensor in the dash has not disintegrated. It had to be replaced in both 123's I've owned. A piece of 1/2" pipe insulation works just fine. Without the air flow, the CCU does not know the temperature in the car.
__________________
'83 300D, 126K miles.
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#5
10-28-2012, 10:51 AM
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Check the connections at the monovalve and the monovalve.
__________________
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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#6
10-28-2012, 02:46 PM
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i had this exact same problem. i had both a bad monovalve and a bad temperature control unit. that one is rarely mentioned. it's located directly behind the glove compartment. its a silver box, about the size of a wallet.
__________________
1981 NA 300D 310k miles
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