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View Full Version : K75S Coolant flush thermostat

dkilmer
03-08-2007, 08:06 PM
I am going to change coolant/flush this weekend. I have the BMW coolant, but has anyone used a flushing chemical? also should I change my thermostat? It looks like they are pricey!
jdiaz
03-08-2007, 08:53 PM
I change thermostats after 8-10 years in service, but I can't ever tell a difference.

The more important things on an old K75 are good hoses, a fresh radiator cap, and a working cooling fan. The caps really get gunky after awhile.
deilenberger
03-09-2007, 12:10 PM
I change thermostats after 8-10 years in service, but I can't ever tell a difference.

The more important things on an old K75 are good hoses, a fresh radiator cap, and a working cooling fan. The caps really get gunky after awhile.And important - check the condition of the fluid hose going to the coolant overflow tank. It likes to dry up and crack, making the function non-functioning. I've never seen any of the other cooling hoses fail..