Originally Posted by dhc905
Hmm, that's a good question - the fan definitely goes out for a moment, but I'm usually at 84F (the max) and so the decrease in CFM might make it feel colder?
I'm taking a 3,000 mile road trip from Chicago to CA via Texas in less than a month. With a 100K on the clock, and the potential that I'll be in the middle of nowhere at some points during my trip, does it make sense to replace the pump/t-stat now? Or don't fix something that ain't broke?
You should read up on the water pump failure issue in the maintenance section. Basically, you can have the car scanned with a BMW scan tool (not a generic OBD II scan tool) and look for the waterpump failure codes. If there are any WP codes present (they do not activate the service engine soon light) have the pump replaced and while at it, have the T-stat replaced too since it can fail at some point and throw the SES light, without causing any drivability problems. At 100K there is good probability that the pump is on the way out.