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#1
11-20-2006, 05:39 PM
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Not vacuum issue what next heater issue
I am trying to get my heater to work.(85 CA 300sd) I was sure that I had a vacuum issue because the car shifts really hard.
I got in there today and got to the solenoids from the ACC. Pulled vac on each pot it my new mighty vac  but all held vac. I then pulled them all down from the main supply line. All held vac. It dropped switching the ACC(only defrost), but always pumped back up. I then pulgged into the unit and stratred the car. The car is deveoping 20 mm-hg at the solenoids. So that seems to be working. I still only have defrost. Is the car pulling eneough and I have 2 sepperate issues? How do I check the electrical connectors on the bottom of the solenoids? What voltage, and what is ground. Also they are labeled 1 to 5. How does that corespond to the push buttons? Is defrost 1 or 5? Thanks
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83 300SD Dark Silver Dark brown inside 
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#2
11-20-2006, 05:50 PM
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I know the 123 has vacuum switchover valves in the climate control. I do not know about the 126. If it does, then it could be one of those switchover valves locked up.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#3
11-20-2006, 05:52 PM
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Does the 126 have a monovalve and does it default to defrost once the monovalve fails?
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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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#4
11-20-2006, 10:55 PM
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What is a monovalve?
The 126 has an ACC that has electric output, this feeds to a solenoid bank that handles the vacuum.
So on the solenoid there is a plug on one end from the ACC, There is a input and an output for the vac. So I am assuming that each onw controls a door in the heating system. I just do not know where each goes, and why there would be no action, other than defrost, or off. I am new and still learning about this type of car. Been fun so far, and you guys are great! Thanks, Doug
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83 300SD Dark Silver Dark brown inside
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