My e36 328i decided to overheat last night on the way home, well, I noticed it was 3/4 on the temp guage where normally, it would be bang in the middle. I stopped and let it cool down and then rather stupidly removed the expansion tank cap!. One shower of hot coolant later, I filled it back up and drove it gently back home the temperature stayed half way as per normal with no problem. I've driven it again gently to my parents today (with the temp guage not moving beyond 1/2) where I've had it on flat ground and been bleeding the thing - I live on a hill - , lots of bubbles coming from the bleed screw when its removed and the car seems to have taken an awful lot of coolant. I went out to get yet more coolant and the temp went back upto 3/4 yet almost immediately went straight back to 1/2 ! I'm wondering if either I have a water pump thats starting to fail, or possibly a dodgy thermostat? It will be into the garage asap to get this sorted, theres definately something wrong, its had a habit for a while of losing nearly all of its coolant after a real hard hoon but the overheating is a new issue, bar giving it a bit of right foot to get it upto motorway speed on the sliproad last night, I was driving it gently following an HGV in the middle lane..... The car has been pressure tested with no fault found. Iirc, Invader had a similar problem which killed his M52 engined 328i, does any of this ring a bell mate? Catch 22, need to get the car fixed asap but equally need the car...... Tempted to take it down a quiet lane & torch it ..... j/k Any thoughts appreciated.