BMW 318 cooling system

Honest John Back Room » Motoring discussion
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Wed 14 Jul 2004 21:37
BMW 318 cooling system - Geffers
The day before I went on a short trip, the "water level" indicator on the car facia showed that the coolant level required topping up. It's a simple DIY job which takes about 10 minutes.

Yesterday, just before I had completed the 80 mile journey, the "water level" indicator came on again. Once I had parked-up, I noticed a quantity of coolant on the driveway. Closer inspection revealed that the coolant was escaping from around the filler cap. Obviously, after I had adjusted the water level, I had not tightened the filler cap properly. This is partly due to its cunning design. It has rounded horns in the clockwise direction to prevent overtightening. However, this also makes it extremely difficult to screw the thing down tight by hand and produce a good seal.
If the tightness of the filler cap is crucial to the cooling system (which it is!), I'm puzzled why BMW make the cap so difficult to grip.
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