Climate control to manual conversion - PeachParts Mercedes-Benz Forum

dmorrison · #6 05-06-2007, 12:28 PM

Quote:

Originally Posted by R Leo

Bruce,
I too will be following your conversion closely because once I get a couple of issues out with the 300D (new half shaft) and 300SDL (PM on tranny and a new serpentine tensioner assy) , I plan to take my wagon off the road to rehab the a/c. I have to pull the dash to r&r the evaporator for the retrofit back to R-12 so doing the conversion to manual controls (I have two full sets of controls and assd. parts plus a parts car with a complete manual dash) at the same time seems logical.

A question:
The manual system has a siamesed heater core (L & R) with a double valve controlling water flow to the two halves of the core. What is your plan for dealing with the control of water to the single core in the ACC heater? I'm thinking that there's probably an off-the-shelf, cable operated Toyota, Nissan or Ford valve that will to the trick.

RLeo
The auto ACC system is also the siamesed heater core. It just does not control either half separately like you can in the 240D.
If transplanting the manual evaporator box then Use the controls that come with the manual system. Control of the water to the 2 halves is via the cables that go to the "manual mono" valve location. The manual system uses a small control valve. Doing the replacement will include replacing the mono valve as well as the cables that go from the "manual mono" valve to the round control knobs at the center consol. The donor car will give you everything you need. The only problem will be the wiring harness and how you will handle that.

http://www.peachparts.com/Wikka/W123Evaporator

Look at picture # 88 shows the 240D valve control. Notice the picture before it of the red 300TD, they use the same holes in the firewall. The only difference is the manual control valve in the 240D and the 2 cables going to the valve. The W123 firewall has the holes for this already there.

If you want I can mail both of you all the pictures I took, on a CD, when both the 300TD and the 240D had there evap replaced. Most are on the WIKI in the DIY section but I have some I did not use. And I took them at 2M resolution which helps when looking for detail.

Dave