Pontiac Montana was created in 1999.
1 and a half gallon of already mixed coolant
Cam sensor location 02 pontiac montana 3.4
For a Pontiac Montana the battery is a group 78. Follow this link for dimensions.http://www.rtpnet.org/teaa/bcigroup.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.