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After heavy rain dashboard emits a constant bing bing bing. This can last 20 seconds or 5 minutes before it stops. If I turn the dashboard lights on during this episode the noise becomes one long continuous bing. Sometimes the check engine light comes on but that also will disappear at any given time. Very confusing and annoying!
VW mechanic thinks it might be the serpentine drive belt tensioner (?) while I'm thinking it's got to be something electrical and loose.
Any thoughts? Thanks.  

there are several VW forums spread around..

it really sounds like you have a rain water leak or a loose connector body that is allowing water into the connector.. or into the dashboard..

could also be from a leaky windshield seal...

if you soap up your windshield..  roll up all the windows..   have somebody close the door hard a few times.. see if bubbles appear around the windshield seal..   they may build and pop fast..


here are some answers i clipped when i googled for 2002 jetta water leaks...

We bought our 2002 VW Jetta Wagon GLS in Dec. 2001. We had to replace the computer module that controls the airbags in March 2003. But we were still very happy with this car until October 2003 after a downpour. The sunroof drains were clogged and the VW dealership would not schedule a repair time for it until after another anticipated downpour. So we searched the internet and found out how to unclog the drains before the next downpour ourselves. It worked! The drains were unclogged.

But this winter, Jan. 2004, we noticed that there was condensation inside the car constantly, and one freezing morning, the car was frosted on the inside on all the windows! There was nothing I could do, but to wait for it to melt! That same day, after work, the car was again frosted on the inside at the parking lot! There is a leak somewhere!

We were able to send the car in for repair the week after, and they kept it for almost a week. As it turns out, the sunroof was not leaking, but the DOORS are! Both driver's side and passenger's side doors were leaking. Driver's side is due to a window seal failure and the passenger's side due to a door seal failure. They had to replace both. They told me that the carpet was soaked.  

Thanks for the feedback.
They have checked the door seals and cleared the sunroof drains and so far so good although still waiting for a heavy rain.  

Keep us up to date it you enter the forum anymore. We are curious to see what happends at teh first rain