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Message: <blockquote data-quote="planta" data-source="post: 230878" data-attributes="member: 7799">Hi Jarance, my best friend fix cars and his passion is BMW. I help him to fix cars or BMW on weekends for free, coz I am gear head I guess. The more you "touch" a BMW, the more you love it and I just had to buy one and did that in June 2007. Thus, I do my own servicing and maintenance for my E46 with the help of my friends.Earlier this year, there was customer at my friend's work shop who had an overheated E46 318 1.9. The root cause was jammed secondary thermostat that also led to a crack at the expansion tank. He paid thousands to fix it coz as everyone knows, overheats leads to serious damage.As for the expansion tank burst due to jammed thermostat while driving, I read about it in another forum. (UDMowners.com).When I first bought my pre owned E46 mileage was 180k km,  I changed the secondary thermostat too. After a month, I also brought it to a BMW service agent for a thorough check up. Another best friend is working there and the first thing he asked me to do since my milage is high was to change the thermostat. He said, he had seen many owners paid thousands for overheating due to the thermostat failure which only cost ~rm250 to change.Hi Daniel. The expansion tank does not come with thermostat. It is sold separately, I changed the thermostat only as my expansion tank is still ok.planta</blockquote>