Does a 1995 BMW 328i engine run off a chain or belt?
The 1995 328i has the 'M52' engine and has a timing chain.
Generally speaking, if the engine is an inline 4 cylinder then it has a timing belt. V6, V8 and other "V" configuration engines usually have a timing chain. Your Astro with an I4 (inline 4) cylinder engine has a timing belt. Available from most auto parts suppliers - just tell the salesrep the make, model, year, and engine size.