Bimmerfest - BMW Forums - View Single Post - How do you check your thermostat on 740i 2001
View Single Post
Old 09-08-2010, 08:27 AM
balance balance is offline
Officially Welcomed to the 'Fest
Location: NC
Join Date: Feb 2009
Posts: 766
Mein Auto: 97 740iL
I'd guess that you need a thermostat then. I've heard that there is a material inside of thermostats that expands and contracts due to heat (wax? or spring?), and if it isn't working in boiling water, there probably wouldn't be a difference with antifreeze? But how long did you keep it in the water? Engines take some time to warm up coolant.
Reply With Quote