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| Drainage of water out of the plenum chamber may be impaired by deposits such as leaves and pine needles accumulating in the water drains -A-. The water level in the plenum chamber then rises if the vehicle is taken to an automatic car wash or in the event of heavy rain, water ingresses by way of the intake housing into the air conditioning unit (heater) and is blown by the fresh air blower onto the evaporator together with the air conveyed. |
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| If the two water drains -A- (on the right and left of the plenum chamber) are contaminated with leaves and pine needles, the drains may freeze up in winter and stop water draining off. After a short journey, the heat emitted by the engine and exhaust system melts the ice in the drains again. By the time the vehicle arrives at the workshop, the water may have already drained out of the plenum chamber. |
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Note