Ben, you could also try to run it without the thermostat in it. See if that makes a difference. I think you can do that, someone will correct me if I am wrong.
Chuck
--- In diesel_mercedes@yahoogroups.com, "bgiovan" <bgiovan@...> wrote:
>
> Fired up the 300SD and cranked on the second try. Yay! Only took me 8 months to get it put back together.
>
> Various nit pick issues which I can handle but one has me stumped. 1979 300SD (W116) with the lovely ACC/Chrysler Airtemp. If I run with the defrost on HIGH and heat on MAX, the car will hover around 100C. As soon as I turn off the defrost (because I'm boiling), the temp starts to climb. Then I chicken out, crank up the heat and it settles back to 100C.
>
> History - bought the car from an old cat in Gainesville, FL back last December. Great shape but blown headgasket.
>
> What I've done over the last 8+ months:
> Professionally rebuilt head with all new innards
> New 1985 Cam
> Rebuilt starter
> New water pump, new Meyle 7 blade plastic fan and clutch
> Rebuilt vacuum pump
> Rebuilt turbo
> Sent radiator out to radiator shop for once-over.
> Various "while I'm in there I might as well's"
>
> Thoughts on the cooling issue? AC doesn't seem to want to engage from inside and being the dreaded Airtemp, not sure where to start.
>
> Ben near Detroit
>
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