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  #1  
Old 09-21-2004, 09:52 PM
John300SDTurbo's Avatar
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Join Date: Aug 2004
Location: Surfside Beach,SC
Posts: 14
Question 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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Old 09-22-2004, 04:32 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,841
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
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  #3  
Old 09-22-2004, 08:40 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
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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