Hey guy's I'm having trouble with my '87 325I with the m20. I have replaced my thermostat with a new unit, I have completely verified that the thermostat is in the housing with the gasket placed correctly, but no matter how many times I have used the methods for bleeding my M20 the thermostat never opens and the car continues to go up in temp. There appears to be no loss of coolant in the system, but and the engine runs fine when cranked. If this post is repetitive I apologize, but I've searched and used most of the methods I have found, including hooking up with my bmw through the reservoir tank. Do you guys have any idea why my thermostat does not like to open?