Hey all, thanks again for your help. I replaced my thermostat as it was taking forever for my car to warm up. Now the problem I'm having is overheating, but I plan on bleeding the system and refilling. If that doesn't work, I imagine it's the water pump??? My other problem that I"m experiencing is that the heater blows cold. I've read on other forums that it might be the heater control valve, or possibly an ambient temperature sensor. Any advice would be greatly appreciated. I haven't been driving the car much this winter, so this problem may not have any connection to the thermostat issue I was having. Cheers! Sam THANKS TO YOUR AWESOME ADVICE MY CAR IS BACK ON THE ROAD, BLOWING WARM AIR IN THE CABIN AND NOT OVERHEATING. THANKS TO EVERYONE WHO RESPONDED. MY BMWCCA MEMBERSHIP JUST PAID FOR ITSELF AND THEN SOME!!!!!!