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Re: vacumm leak,sometimes won't shift gears,vents in car...
If you can hear a leak, half the battle is won. Use a piece of vacuum line or other hose and place one end near your ear and use the other end as a probe...Move the end of the hose around 'till you hear the leak the loudest and check visually to find the problem. 'sounds a bit silly but try it...it really works!!
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Most vehicles have a check valve (one way valve) in the small vacuum line that supplies vacuum to the dash heat/air controls. If this fails (and quite common to do so) the vacuum operated controls act as you describe. Might try hooking up a vacuum gauge to see what is happening as you drive. Brake issue may be unrelated but if it is happening at the exact same time that is very strange. The brake booster has its own check valve, but a failure there would act just the opposite, as you might have some vacuum to make brakes work at first, but would quickly get worse. Color me stumped on that one.
ck for vacuum leak some jeeps are vacuum some are electric ,the mode control is in default if vacuum a leak if electric the control panel or mode door actuator , the electric you can sometimes hear if not try to see under dash some the dash has to be removed to see.
Vacuum supply starts on the drivers side of the engine. There is a vacuum line going into the brake vacuum assist from the manifold. branching off of that line is a double line that snakes under the intake manifold, behind the valve cover, along side the valve cover on the passenger side headed to the front of the engine. Then it curves to the right side of the engine. One set of hoses from this line goes to a valve control (red and green i think). The other line goes to the vacuum storage ball, it should be black. The vacuum circuit continues out of the ball in another black line that snakes into the firewall. It goes under the heater core black box and disappears under it. Now go into the passenger compartment and drop the glovebox. look to the back right you will see a black and a white vacuum line coming out of the firewall. The black line is your vacuum supply from the engine. It goes up to a little rubber manifold. disconnect the lines coming from the dash switch and check for vacuum on the manifold where the black line is going in. The white line controls the cabin air intake under the glovebox and the thermostat shutoff under the hood. It should only have vacuum when the switch is in a certian position, AC probly. The other three lines coming off the rubber manifold snake behind the dash vent door assemble and come out near the gas peddle. The red one controls the dash vent. apply vacuum to the red hose and see if the vents go to the center dash position/AC. The yellow and blue? ones control the floor vent control near the gas peddle. yellow gives you half floor and half defrost. blue gives you all floor. you can use a small vacuum line to connect the black vacuum supply to each individual line on the manifold and check the function of each vacuum control assembly individually. I hope this helps. On my truck each control unit works fine when i apply vacuum to them individually but when I hook the dash switch up to the rubber manifold it goes to defrost. I tried changing the dash switch and the lines running from the switch to the rubber manifold and the vacuum ball under the hood, nothing works. I suspect I may have leak i just haven't found yet. next step is to get a vacuum gage and start checking the amount of vacuum i am getting at each vacuum line. I'm sure it is supposed to be getting a specific amount of vacuum and will not work if the vacuum drops below a certian level due to a leak in a line somewhere? God bless.
THere should only be one vacuum hose going to your transmission, and it plugs on to the modulater valve. If you think it's leaking, replace the whole hose. It could be any vacuum hose leaking oin the engine. About all you can do is , with the engine running, wiggle all your hoses and listen for a hissing sound. Check for cracked, damaged or loose hoses.
Is there air blowing from the front vents? or can you hear the vacumm change when you change it from heat to cool..... I think it might be a vacumm problem... its a 1997 so the controller vacumm hoses may be cracking.. let us know