The sensor for the dash temp gauge is a one-wire sensor, but it is located on the side of the cylinder head between the glow plugs. If original, it doesn't hurt to replace it, although usually when they go bad they read low, not high. A new sensor is about $10-12 from Rusty.
The sensor you're seeing at the t-stat area is either for the EDS (which I didn't think was used back in 1982) or it's a temp switch of some sort. I haven't owned a W123 in a while and I forget what the sensor up top is for. :) -- Dave M. Boise, ID 1994 E500 - 95kmi (Q-ship) 1987 300D - 263kmi (Sportline) > ------------------------------ > Date: Tue, 04 Apr 2006 11:04:12 -0400 > From: [EMAIL PROTECTED] > Subject: Re: [MBZ] 82 300D-T running hot after acid flush > > >New Question: > > I guess the sensor is located on the top of the motor very near > the thermostat housing with one wire attached ?
