Originally Posted by jmurphy
My 323i does not reach the optimal temperature any more and the blowers are just blowing Luke warm air!! I think it has something to do with the thermostat but I don't even know where to start the diagnosis or fault finding, any ideas??
First make sure the system is completely bled. Do a search, should be many threads. If it is bled correctly, and you're still not getting hot air, it could be the thermostat.
1995 325I, window tint, K&N, debaffled airbox, BMW #104 wheels, Nighthawk low beams, smoked side markers, smoked corners, smoked taillights, M3 stlye heated mirrors, various interior bits, Bosal cat-back.