I have a 1999 Jaguar XJ8 and have water coming in under dashboard of passenger side when it rains or in a car wash. Any ideas on how I might be able to stop the leak?

 

There should be drains under wiper cowl trim - if this are blocked water may be overflowing in through recirc flap and blower motor into vehicle.


Or it might windshield itself leaking

 

There's a rubber flap under the wiper motor housing that drains water out - if that is gummed up closed it can cause water to overflow into the air intake like JBz said. Take off the wiper cowl trim and pour some water in with a garden hose - it shouldn't pool up in the motor housing. Poking the valve open should be all you need to do. Make sure not to take it out completely, it's at an angle that's nearly impossible to reinstall once popped out unless you remove the whole wiper motor housing assy, which is a huge pain.

There's also overflow drains at each edge under the cowl - be sure to check those too.

 

Thanks very much for the tips nilanium and JBzXJ40...I'm going to give it a try today.