E46 M3 Thermostat Replacement & Coolant Flush - FULL STEP BY STEP GUIDE

Let’s talk about a job that every E46 M3 owner is going to face at some point — changing the thermostat and doing a proper coolant flush.

We’ve filmed the whole thing start to finish so you can follow along at home. None of that confusing jargon, no skipping steps, just real tools, real advice, and a real E46 M3 on the driveway.

Whether your thermostat’s stuck open and the car’s taking ages to warm up, or you’re just sorting your cooling system as part of your maintenance routine — this video’s for you. We walk through everything from draining the old coolant, removing the thermostat housing, refitting, torquing everything back up, and then bleeding the system properly at the end.

It’s one of those jobs that sounds a bit scary, but once you’ve done it once, you’ll wonder why you didn’t just crack on sooner.

Got questions? Drop them in the comments.
Done this job yourself? Let us know your tips or horror stories.

This channel is all about keeping these old BMWs alive and having a laugh while doing it.

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