I need the vacuum hose diagram for a 95 Roadmaster

You should only have 1 vacuum hose that goes from the intake manifold into the evaporator core housing and thru the firewall. It should be easy to check for engine vacuum at the heater control head by taking the control head loose and pulling the vacuum manifold from the back of the switch with the engine running. You should get a very noticeable sucking noise from the manifold. The line that goes thru the firewall is a small 1/8" plastic line that gets brittle over time and is known to crack and break under the hood.

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Hears the deal Chevy really dosn't use vacuum for engine control it is more important for the AT transmission shifting .
You have main lines 1 goes to the vacuum booster control unit for the power brakes another goes to the PCV valve and depending on what you have for small lines going to vacuum reservoirs
I would look at the MAP sensor Manifold absolute pressure .
All vacuum comes off the intake manifold its the draw of air the engine needs to run .If the Map is bad you will have A LOT of of problems with how that engine runs ,It plugs in to the intake manifold 3 wire about 75 dollars maybe slightly less its a good place to start .

I found lots of info for you, hope it helps, you will probably like the last one the best:

Hi,
The best way is to trace that vacum line and see where it leads. If it has come off the intake manifold area then it will need to be refitted as it is a main vacum supply hose to other components.

On the 95 5.2 318 SLT it comes off the passenger side of the intake manifold around middle ways under the center section bellow the throttle body.From there the vacuum line goes through a one-way "in-line"directional valve.The valve has the black side to the vacuum port of the manifold. It there goes to a "T" fitting.One hose on the "T" goes to the driver side through the firewall to regulate air flow in the cab.The other side of the "T" goes to the air ball next to the cruise control servo on the firewall. This hollow ball stores 10" of vacuum to operate the vacuum diaphragm of the cruise control servo. Hopes this helps. Jimmy

Sorry I don't have the diagram, but I do have a diagram of the engine and component locations. Your vacuum system is fairly simple. You have a MAP sensor attached to the air cleaner. I have pasted a picture below. It has one electrical connector and one vacuum hose that goes to the intake manifold or the throttle body.
Behind the right headlight is your evap canister. This will have a hose or line running to the fuel tank. Then it will have another hose going to the purge valve. The purge valve should be close by and it has a connector plus another hose that goes to the intake manifold.
Then you have the PCV hose that goes from the PCV valve in the valve cover to the air cleaner or intake manifold. I think yours just has a hose from the air cleaner and the rest is internal.
There is one more vacuum hose, and that is the bog one that goes from the intake manifold (or throttle body--looks to me like there are a couple of vacuum ports on the back side of the throttle body, and there may be a "T" on one of the hoses) to the brake booster. It this one was off, the engine would not run, as the vacuum draw is large. Please let me know if you cannot figure it out from these instructions and provide a picture, if you can.

MAP sensor:


purge valve:

Probably a vacuum line. Most heater controls are ran by vacuum and their is one vacuum line that goes from the troddle body to the firewall on the passenger side of the car. Check for a broken hose.

this hose should connect to the intake manifold, listen for a vacuum leak near the regulator, sorry cannot send diagrams

1. On models equipped with airbag, disable airbag system as described under MAINTENANCE PROCEDURES/AIRBAG SYSTEM DISARMING .
2. On all models, disconnect battery ground cable, drain cooling system and remove air cleaner.
3. Disconnect accelerator, transmission and cruise control linkages, as equipped.
4. Disconnect fuel line from carburetor or TBI unit and remove fuel line clips as needed, then remove carburetor or throttle body from intake manifold.
5. Disconnect necessary vacuum hoses and electrical connectors, noting position for installation.
6. Disconnect upper radiator and heater hoses from manifold.
7. On Cadillac Brougham models, remove thermostat and housing.
8. On all models, remove distributor.
9. Remove ignition coil, AIR pump, cruise control servo and brackets, as needed.
10. Remove alternator upper mounting bracket and EGR solenoids.
11. Remove manifold retaining bolts and the manifold.
12. Reverse procedure to install, noting the following:

1. Ensure surfaces are clean and dry, then apply 3/16 bead of RTV sealer on each block ridge and apply suitable sealer around water outlets, install gaskets and secure gasket position by extending bead of sealer approximately 1/2 inch onto gasket ends.
2. Install manifold and retaining bolts, ensuring areas between case ridges and manifold are completely sealed.
3. Torque manifold bolts to specifications in sequence shown in Figs. 2 and 3.
4. After installing carburetor or TBI unit, check to ensure no fuel leakage is present.

1. Rearm airbag system as described under MAINTENANCE PROCEDURES/AIRBAG SYSTEM DISARMING