I've got a 1985 Dodge D150 2wd and there is a detailed vacuum hose diagram on a sticker on the inside of the hood.
A vacuum diagram for the four wheel drive of a 1991 Jeep Cherokee can be found in any Chilton's manual for that year of vehicle. The vacuum system allows the vehicle to switch from two wheel drive to four wheel drive on demand.?æ
Need a diagram for 1997 dodge van drive belt installation
this question should be under dodge automobiles
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yes
Check for vacuum leaks.
It is on the top of the transfer case.
I would start by checking vacuum lines
Go to your local Library and look in the auto service manuals, find what you want and you can get copies for 25 cents each. Here is a link for the 4 wheel drive vacume
probably a vacuum system leak. Older dodge trucks had the front transaxle engage by a vacuum line. Make sure your pump is working, and that there are no leaks. Then it should engage
Check for vacuum leaks,
should be under the hood on the top crossmember above radiator or on the underside of the hood.