My original post is in the diesel section, but I thought that it's worth everyone knowing. After receiving some great advice and links from other forum members (thank you) it appears water leaking into the engine compartment is quite common on Promaster/Fiat. On mine, water is getting in and onto the belts causing a belt squeal. According to some postings alternators have seized and electrical parts have rusted out. The problem, according to other sites, is a loose fitting cowl at the base of the windshield. I water tested mine and sure enough water pours in. Here's a quick video and photo from mine. I think it's worth water testing yours.
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