Is it possible that if my freon charge is low that I could have cool from middle vents and heat from the outer ducts? thanks

Not likely

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15 VW Passat TDI
00 E420
98 E300 DT
97 E420 Donor Car - NEED PARTS? PM ME!
97 S500
97 E300D
86 Holden Jackaroo Turbo D
86 300SDL
(o\|/o)

Thanks might you suggest a place to start? The car is a 94 c220 w climate control.

If you do a search for " vent actuator diaphragm" or "vac pods". Weeks worth of reading.

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BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif
15 VW Passat TDI
00 E420
98 E300 DT
97 E420 Donor Car - NEED PARTS? PM ME!
97 S500
97 E300D
86 Holden Jackaroo Turbo D
86 300SDL
(o\|/o)

Start with the control of the heater valve. It is a pulsed valve and it will have power AND ground when closed. The power will come when the key is turned. The ground is controlled by the AC control unit. In the "low" setting the valve should see a constant ground.

I usually confirm the situation by taking needle nosed vise grips with fuel hose over each "needle" and squeeze the inlet or return hose shut (the fuel hose protects the water hose from the jaws of the pliers) and then drive. By restricting the flow of hot water you duplicate the activity of a closed water valve. If that solves the problem then see if you have electric control. if you do then a bad valve is the logoical answer.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Thanks Steve I appreciate the help...my heater valve has two outlets on one side of the valve and one outlet on the other. The single comes from another main supply valve according to my Haynes manual. My question is can I just crimp the single inlet as you stated and then drive. I'm just not familiar with the flow directions. The top of the valve has two electric solenoids. I assume these are the ones that are directed the module to control flow? Thanks again I'll post after following your advice.