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A collection of helpful articles based on reader submissions
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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

94 Pontiac Bonneville SE, Leaking Moonroof
Q: I have a '94 Pontiac Bonneville SE with a power Moonroof. I don't have any leakage with the roof that I'm aware of, but recently I have noticed the headliner above the driver and passenger doors is damp and has a white chalk type stain. Does this mean my Moonroof is leaking? Also, when the car is running you can hear an electric motor type sound, that changes tone with RPM. A friend suggested that it was the fuel pump making noise and that I should just turn the radio up. Whattaya' think?.. J J

A: WhattaI' think? Have the drains checked. Factory installed Moonroofs and sunroofs have a built-in drainage system that captures water and channels it out of the vehicle. Plastic tubing is used that travels under the headliner and down a door pillar and exits the vehicle. It's not uncommon for debris to restrict or plug the drains. The result is a backup of water, which drains inside the vehicle. As for the electric motor type sound, have it checked out, you may be hearing the beginning of the end. The end is when you're stuck on the side of the road.

 
     
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