[W126 Coupe] Thermostat R&R for 85 500 SEC

[Robert Cavazos]

David, it's been a while since I replaced one, but a couple of things come to mind:
  1. Go easy on the three bolts getting them out--wouldn't want to snap them off.
  2. When installing the new stat, make sure the little hole in it is at the 12 o'clock position.
  3. Use anti-seize on the bolts when re-installing.
  4. Mix the coolant & water 50/50. Don't just dump a gallon of  coolant in the system and then top of with water. And use MB coolant.
  5. Replace the radiator cap with a proper pressure one. Replace any  hoses that are bulged out, or hard. If it's been several years, you  might want to consider replacing them all at this time.
  6. Tighten the hoses. I did my wife's SL t-stat and all hoses but  didn't tighten them enough. Found most all of them all leaking when I  pressure tested the system later. Funny thing was there were no visible  leaks prior to the test.
  7. Check the radiator level daily for the next week.

David Fatovic <coloradocroat at yahoo.com> wrote:  I need to replace the thermostat in my 85.  The engine
does not ever reach any sort of operating temp, I
believe the thermostat is stuck open.  

Is there anything I need to watch out for?  Any good
tricks?  Anything to avoid?

David
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