It would depend on what type of information that you are looking for on the 1999 Montana. I own one and have purchased a haynes manual somewhat helpful but does lack the read inner detail that a chiltons manual holds, best of luck to you.
Pontiac Montana was created in 1999.
Cam sensor location 02 pontiac montana 3.4
alternator
215/70R15
with explosives
p134
For a Pontiac Montana the battery is a group 78. Follow this link for dimensions.http://www.rtpnet.org/teaa/bcigroup.html
drums
Commando Car Alarms offers free wiring diagrams for your 2001 Pontiac Montana. Use this information for installing car alarm, remote car starters and ...Updated URL from the same site: http://www.commandocaralarms.com/wiring/1999-2005/Pontiac/Montana/1374.html
You can find the oil pressure sensor for your 1999 Pontiac Montana on the front of the engine. The low pressure oil sensor will be just below the left cylinder head.
The firing order of a 1999 Pontiac Montana mini van is 1, 2, 3, 4, 5, 6. The number one cylinder is located at the front left side of the engine.
Yes, it is accessed inside the glove compartment