Thermostat replacement

[Martin123]

Hi all, I want to replace the thermostat in my 1989 325. The Haynes says I have to drain the coolant, is this really necessary?
Cheers
Martin

[jann]

Yep, since the thermostat open/closes to cool the engine.

[Brianmoooore]

A good deal of the coolant is coming to come out anyway when you remove the thermostat elbow, so it's probably a good idea to drain it first! Why wouldn't you?

[Martin123]

Thanks for your replies. Thought I could make it a quick job but I see I'll have to drain, it needs it anyway.
Cheers
Martin

[ucpsale]

Good idear to raise the front when draining and when you have the stat cover removed make sure the bleed hole is clear before refitting.