Quote:
Originally Posted by Mxfrank
The red switches were used on M102 190E's. I've never understood why Mercedes chose such incredibly high temps for the Diesel cars. The only thing that makes sense is that they were conserving horsepower so the DIN testing looked better.
Funola:
These are 14mm switches. You won't find much selection in that size, especially if you want the double throw functionality. My trick is to remove one of the water gallery plugs on the left side of the head, and replace it with a 22mm fan switch. 22mm switches are used in many VW, Porsche, Jaguar, and Fiat applications. You can find them in setpoints from 72C to 120C. I'm currently using a 95C Porsche switch, and I think the thermal control is as good as it can be. If you wanted to use the electric fans as primary, a set point of 92C, as used in VW's would be perfect. I have access to lots of thermal switch data if you need some help with this.
Also, that isn't the thermostat housing, it's just a coolant outlet.
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Please explain what you mean by "Mercedes chose such incredibly high temps for the Diesel cars"? Are you referring to the T-stat temp or the viscous clutch engagement temp?
Did you eliminate the clutch fan and run only the AC electric fan via a 95C temp switch on the head? How does it perform? How often does the fan kick on?
As to whether it's called a thermostat housing or a coolant outlet, how about we call it half a thermostat housing? The thermostat sits halfway in it. The other half sits in the thermostat cover.