I would really like to see pix, parts and numbers from this job - thanks, Doug! One question I have though, does the monovalve just turn on and off or does it have intermediate settings depending on how much heat is needed? I don't understand how the heater air is made warm as opposed to full hot. Is it an air mix from an air flap and vacuum valve? Or is it the monovalve that controls how much coolant flows through the heater core? Thanks!
Jim
--- In diesel_mercedes@yahoogroups.com, "Doug" <doug.traylor@...> wrote:
>
> GENTS, As too heater cut of valves, too fully cut off coolant flow to the heater core, there is a generic manual valve, used on anything the has a heater, NAPA has them, less than $10, available in 5/8 or 3/4 hose size, coolant flow can be cut off by your fingers, as it has a small handle. I have one on my '81 300d, just in case I get a leak, can shut it off under the hood very quickly.
> I have bypassed all those flakey control valves, that quit long ago, an use this manual valve too completely shut off coolant flow during our blistering hot TEXAS Summers.
> Also bypassed the electric coolant pump, as it has quit too. A new hose straight to the heater core, from the engine, with the manual valve handy on top of the valves cover, an tied off with a tie wrap.
> Will upgrade this later with a 80s Oldsmobile cable operated manual valve, an 80s GM pu trk dash AC / Heater control unit mounted in the place of the ash tray, to manually control the whole AC an heater system.
> When I do that , will share all with group, including part numbers, an photos too, but its pretty darn simple to do. PAP has plenty of the GM truck dash control units, an the Olds cable control manual valve, I have a part number in my Suburban file.
> Should not be a problem for most of the shade tree techs an pros on this group. Maybe even someone do it better than me. Open too suggestions.
> Doug, doug.traylor@... ,lurking in Baytown,TX 300D 196K,, daily driver, 78 300SD parts queen. RUSTY, but wunderbar spare engine an turbo, start an run monthly.
>
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