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Old 04-17-2008, 11:00 AM
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Join Date: Feb 2007
Location: Milwaukee, WI
Posts: 198
Engine Temp Sensors

My '79 240D has two temperature sensors on the side of the engine block.

I suspect one is a switch for the A/C; and the other is a variable resistor for the instrument panel. Anyone know which one is which? I don't have a schematic.

Also, does anyone know the target resistance of the gauge sender? these things typically have one resistance at cold, and another at fully warmed. My temp gauge barely moves from the lower point, but it does move; so I'm suspecting the sender.

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Old 04-17-2008, 12:15 PM
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Join Date: Apr 2002
Location: NW WA
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I dont remember which is which, one if for the GP relay, other temp gauge, just pull a wire and see which doesn't work, you should be able too tell. As I remember, no continuity means no workie. They are cheap and easy to replace.

1985 Euro 300TD 5 spd 220K
1985 Euro 240D 5 spd 130K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
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Old 04-17-2008, 12:36 PM
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Join Date: May 2007
Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
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On my 617, the rear sensor is for the gauge. try switching the wires on the sensors. If the gauge works,yeah, we did it.

when we first bought the car the gauge didn`t come up to 80c. the thermostat was broken where the humped piece of metal was spot welded to the base.

Charlie ☺
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

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