Put your hand on the heater hoses upstream of the servo to see if coolant is flowing. In my experience, coolant flows thru a non-functioning auxiliary pump, just not as well.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

This just dawned on me. I have my old servo. I replaced it cause it was leaking, and the AC stopped working on it. So it froze in heat on mode. If I connected this unit in an effort to see if the mode the unit freezes in matters, is this a valid test or just a waste of time? I dont have to drain any coolant as im just connecting power and vacuum.

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Marty Watts - Concord, NH
1979 300D NA - Maple Yellow - Palomino MB Tex

bump.

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Marty Watts - Concord, NH
1979 300D NA - Maple Yellow - Palomino MB Tex

It worked. I put the original servo back on. Whatever valve was closed in the heat off position was not letting hot air blow. The old servo must have last been used with the heat on position? Anyway...I have heat.
Next, replace nailing injectors...

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Marty Watts - Concord, NH
1979 300D NA - Maple Yellow - Palomino MB Tex

So, after having heat for a week....THANKS TO UNKL300D!!!
I'm all toasty now.

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Marty Watts - Concord, NH
1979 300D NA - Maple Yellow - Palomino MB Tex

Nothing like having heat when it is cold. good you got it going, those Servos are a pita.

here is a thread for an after market upgrade. at least another option to work on.

www.peachparts.com/shopforum/showthread.php?t=219993.

Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works