Thread: engine temp fluctuations normal or not
View Single Post
  #2  
Old 02-26-2010, 08:51 AM
Ferdman Ferdman is offline
Registered User
  
Join Date: Aug 2002
Location: Southeastern PA
Posts: 3,077
Coolant temperature should remain essentially constant when the ambient temperature is 30 degress F, around 80 degrees C. I would suspect a thermostat, stuck partially open, is causing the coolant temperature fluctuations. Install a new Behr or Wahler thermostat in your 1993 400SEL.
__________________
Fred Hoelzle
Reply With Quote