I've LOST my expansion cap!!!!

Went to top up the expansion bottle this morning (I loose about a cm per week), opened the boot, removed the wire guard and suddenly noticed that my expansion cap was missing!!

Now I'm a stickler for procedure, I always remove the cap and place it on the bodywork just between the rear screen and the expansion bottle as well as the cap for the coolant bottle, so that way it would be obvious if I forgot and shut the boot lid without replacing it.

So what can of happened to it? Blown off? I've had no overheating problems with it recently and there was still only the normal amount of coolant missing this morning!



:confused::dunno:

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