Quote:
Originally Posted by alanaslan
For the sake of a few pounds you can fit this simple device which will tell you if your drain is blocked. I clean and blow through my box every year when I change the cabin filter. I think the ones fitted to my estate and my wife's saloon cost about a fiver each. Mine run off a pp3 nine volt battery. Which I also change at the same time of the cabin filter, though as the battery has no drain on it unless there is an activation so in theory the battery should be good until its use before date. A small price to pay for piece of mind.
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Be aware that the plenums are supposed to get wet anyway, so such a unit has potential to trigger every time the car was out in the rain. There is only an issue when the drain is obstructed and the plenum fills up, by which time it is usually too late anyway.