Auto parts store. The Chiltons and Haynes manuals sold at Autozone, Pep Boys, etc. are of questionable value at best. Spend the extra money (or sometimes less; check eBay) and get the much more complete GM service manual for all "U" Platform vans. You will thank yourself. Sorry I can not find at any part stores a 2002 service manual. try this web site ,,it will cost a little but it is good info http://www.alldatadiy.com/
2002 Montana Seat Repair
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how do you change a battery on a 2002 Pontiac Montana
Where is the heater core for a 2002 pontiac montana
the 2002 Pontiac Montana came with a 3.4L engine.
Try ebay. They usually have a variety of used owner's manuals probably for about 10 bucks with cost of manual plus shipping.
Haynes Repair Manual. I had to replace front passenger side wheel bearing. The manual will walk you through it. I did have to get a pulley puller in order to get the brake disc off. Pretty straight forward though.
Where
This is a major repair requiring the removal of the intake and exhaust manifold, and then the removal of the heads. Not a DIY repair unless you have the knowledge, and tools necessary to accomplish this repair. If you want to tackle this job, I suggest you buy yourself a repair manual for your Pontiac.
How to disengage Pontiac Montana 2002 anti-theft system
2002 Montana holds 4.25 Litres including the oil filter.