I just got another thermostat for my 87 300td. I took back the new one I bought from the dealership. I put the stat in water and slowly raised the temp and it opened just before boiling occured. The second one from same dealership did the same thing and same result. Thermostat should open in 80 degree water correct???? Need suggestions???????

80 degrees Celsius=~176 degrees Farenheit

Both T-stats are fine.

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Keep everything as simple as possible-but no simpler--Albert Einstein

Well why was I a science major??? So I can forget everything I learned. Thanks for the refresher.

Did you measure the water temperature when they opened (cooking thermometer)? There's quite a difference between 176 F and 212 F.

T-stats start to open at a lower temp than when they're fully open...

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

True, If I remember correctly the OEM 80 C stat is full open at about 95 C (203 F).