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.
engine diagram of 1995 chevy astro vas
Timing CHAIN on your 2.2 liter
TIMING CHAIN
i know the 2.2l from 1995 is. if it is an overhead valve then most likely it is.
If your vehicle is at least 60,000 miles it is recommended you replace the timing chain. If your timing chain broke, your engine would NOT run because the timing chain is what rotates your engines camshafts to open and close the valves. Also, you would have some serious engine damage if you were driving and your engine suddenly just quit and it happened to be your timing chain. There really is no way to "check" a timing chain as it's hidden behind the belt area of the engine (if I'm not mistaken). If you're going to go through the labor of "checking" a timing chain, you might as well replace it, as the average timing chain job costs about $220, $200 of that being the labor.
The 1995 Land Rover Discovery has a timing chain.
timing chain
A 1995 Toyota Corolla has a timing belt.
On a 1995 passport it has a timing belt
top section of timing chain cover in front of the intake manifold
chain
A timing CHAIN