B C Posted July 2, 2019 Report Share Posted July 2, 2019 Over the years a lot of blame has been placed on BMW engineers for incorporating plastic impellers, coolant pipes, thermostat housings end tanks, and viscous clutch fans on the cars which ultimately were believed to fail, causing overheating, blown head gaskets, and cracked cylinder heads. This is a flawed belief. Pay attention to any good build thread and you can see that even after aluminum components, metal impellers, overdrive pullies, Water Wetter additives, and electric fans are installed, temperatures still continue to be on the uncomfortable side of normal and overheating can happen. This proof shows us that it has nothing to do with plastic parts. The reality of the situation lies in the fact that the thermostatic coolant flow control valve known as a "thermostat" is actually a living breathing organism. How else would it move without compulsion from an external energy source such as electricity, magentism, or hydraulic force??? Thermostats are living breathing entities. "But my BMW is fine, it has no issue with overheating" In a closed dark environment, filled with coolant, a thermostat does not know where it is at any given time. HOWEVER, the moment you remove your thermostat housing to do some preventative maintenance, the thermostat is exposed to the environment and becomes aware to the fact that it resides in Wisconsin, a brutal frigid climate with which the thermostat wrongly assumes it can take a break. So have you recently worked on your cooling system only to find that your car is now running a bit hot or overheating? Now you know why. P_Roloff, jc43089, m42b32 and 3 others 6 Quote Link to comment Share on other sites More sharing options...
GunMetalGrey Posted July 2, 2019 Report Share Posted July 2, 2019 I always thought thermostats were nothing but freeloaders! I'm glad you got to the bottom of things. Quote Link to comment Share on other sites More sharing options...
rampelsauce Posted July 6, 2019 Report Share Posted July 6, 2019 I'm living proof of this theory. Quote Link to comment Share on other sites More sharing options...
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