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#1
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Looking for advice
I seem to have developed a vacuum leak but I'm unsure where to start looking. I'm hoping one of you can point me in the right direction. Here's the deal..... had a rather cool morning yesterday and so I spun my ACC dial to full heat to let it warm things up a touch. All was well until I got to work and turned off the key switch. You guessed it! The old girl kept right on running. Realizing that the ACC dial was the only thing I had messed with I turned the key switch back on and spun the ACC dial back to full cool. Turned the switch off and bingo, she shut right down. I think there is a control valve against the firewall beside the battery somewhere that controls water flow to the heater coil (if I understood some of the stuff I've read), is this control valve vacuum activated and could it be the problem? If not, any suggestions on where to start looking? Any advice is greatly appreciated.
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1983 300SD Turbo 350,000 and going strong. And they say the Energizer Bunny never dies! |
#2
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The monovalve is not vacuum actuated.
More likely a bad ACC actuator in the loop. Probably the footwell flap actuator since it is actuated in heating modes but not in cooling modes. Do a search on testing the actuators for instructions on pulling the center console panels to get to the bank of switchover valves so you can test the actuators at a central point. Sixto 95 S420 87 300SDL |
#3
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You probably have more vac leaks that that, though -- usually a leaking climate control isn't enough to wipe out the shutoff.
Check ALL the rubber connectors on the vac lines in the engine compartment. Likely most of them are hard and brittle, which means they are leaking. You can either buy actual MB replacements or just get some appropriate sized vacuum hose and cut pieces to replace. Check for plugging in the fittings, too, but DO NOT ream them out. The ones on the main vac line for the 617 have precision orifices, and you will have trouble it you widen the opening. Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs! |
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