I'm running an OM617.952 that I swapped into my 107 and have been working through the systems. As it stands, "normal" operating temperature is about 60C or a little less, with an ambient of around 80F. Normal driving doesn't make it move all that much. A hard pull up a 6% grade for 2000' will bring the temp up to 80C or maybe 85C at the same ambient. Dropping back down the grade quickly drops the temperature to 60C.

From everything I've read, with an 80C thermostat I should be reading 80-100C as "normal".

I'm going to crack open the thermostat housing next week when a new gasket arrives and I'm guessing I'm going to find no thermostat in there. I've got a thermostat that came with a housing I pulled awhile back and a pan test showed it opening properly right at 80C. I'll be swapping that one in.

Two questions
- any other conditions that would cause the low temp readings I'm seeing?
- about how much antifreeze will I loose when I crack the housing?

Thanks

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Current Stable

• 380SL (diesel)
• Corvette C5
• Manx
• Baja Bug
• F350 Powerstroke
• Auburn Boattail Speedster replica