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9.1.9 - Preventing problems ( )






duckbill diagram

The blowers suck in air from the space below the grills in the cowl either side of the windscreen wiper. These grills also let rain water into this area. This water drains out below the wiper motor through a tube about 1.5inches in diameter. This tube is usually protected with a rubber 'duckbill'. You'll realise why its called this when you see it.

This design is not great as leaves and rubbish can collect in the bill and block the water from escaping. This can fill up the are under the cowl and then flow into the blower motors short circuiting their electronics, running out onto the carpet and in the worst case scenario burning out the main ECU, not funny.

So its vital to check that this draining freely, by pulling it off and cleaning. Some suggest cutting a couple of mms of the end of the duckbill to promote drainage. Others suggest leaving it off altogether. I would be wary about this a one lister reported acorns in the blower motors. I think this drain would provide a snug place for a small rodent to want to nest in, the duckbill should avoid this happening. In some models its easy to get at the duckbill from above see the picture in other people suggest crawling under the car and poking it from below (wearing goggles!).

Whilst your doing this also check the gas filler cap, this is another area that can fill with leaves and if the small drain in the rubber is blocked fill up with water above the level of the filler cap. This shouldnt be a problem but if the filler cap is loose then water will get into the gas, also not funny.


 

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