You may have a disconnected or broken vacuum line.
where dose the vacuum under the battery come from
You can find this schematic (and others) in the Chilton's manual for your truck.
look on e bay, they had a use Nissan service manual for 5.00
If you are talking about the emission control system vacuum schematic, purchase a Haynes manual and turn to page 6-2.
The vacuum diagrams are too large for me to post here. But you can get them at the Public Library in the Reference Section.
Mazdatruckin.com has a schematic for the B2600i vacuum lines in their tech section, it includes 4wd and cruise control devices. See the attached links below.
The AC system from a newer Nissan 300zx can be retrofitted to a 1987 with a serious vacuum problems by making a number of modifications. New mounting brackets, wiring, refrigerant, and AC hoses will be needed.
You can find a detailed vacuum hose schematic for a 1984 Oldsmobile Cutlass Supreme in the car's owner's manual. You can also check with local auto stores.
Inspect all the vacuum lines, you may have one cracked and you are loosing vacuum to operate the HVAC system.
Yes as long as its free
It is important to have a diagram when making any changes to a car. For this car a free vacuum diagram can be obtained through asking an auto part store technician for a print out of the schematic.
Need more information.
haynes repair book at auto parts store or get a Nissan truck service manual,check eBay .the dealer wants 75.00.
Autozone has Vacuum diagrams online in their repair manual section http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800618ea
The vacuum line diagram for a 1988 Nissan Z24i can be found in its maintenance manual. It can also be found in the cars repair manual.
If you can, try ALLDATA. It will give you a really good diagram of the whole system.
You go to all the trouble of asking a question and then you leave out the information that will allow someone to actually answer your question. Look at what you wrote. You want a vacuum schematic for a 1995, but you do not list any make or model of vehicle. So there is no way I or anyone else can provide an answer. You have posted an unanswerable question.
Chilton has a manual you can pick up at your local auto store that has all wiring and vaccum diagrams for 89-92 180sx/200sx/240sx No it doesn't, been there done that. It has wiring schematics for everthing but the engine bay. It has Vacuum and wiring diagrams for everything but a 1990 240SX with the KA24E.
could be a leaking vacuum hose or missing vacuum system cap
There is a sticker under the hood somewhere that will show you where thay go.
in a haynes book
Mithell Manuals online 14.99 a month. You won't find it for free. local library brought up the vacuum diagram on the computer for me cost 25 cents 25 cents was for print out