Quote:
Originally Posted by ASteele
Im just wondering if I should buy another thermostat locally that opens almost fully around 80C instead of 90 C when I bench test it.
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The thermostat rating is the start of operation temperature. The thermostat should begin opening at 80C, it will not be "fully open" until several degrees above that point. Keep in mind that MB uses a "bypass" cooling system, so the thermostat is also closing the bypass port. A bad thermostat will leave that port uncovered and you'll be recirculating hot water through the block.
Stant is a relatively cheap brand. You're welcome to keep giving them your money. If you don't want to go OE, use one of the OE suppliers - Behr or Mahle (not Meyle). They cost what, $10-15? Bench test before installing.