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I have a 1980 Vette. I just replaced the Climate Control unit. Now I hear a hiss like (vacum leak where the vacum hose attach to the unit0 and when I place the control lever to Vent or Defrost no air comes up thru the upper dec or defrost vent on top of the dash. I have checked my electrial connections

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Yes you have a vaccum leak recheck all the vaccum line and the vents should start working

Posted on Aug 28, 2008


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Posted on Jan 02, 2017


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Have02 buick cent,starts right up,I hear air hissing while drivin doesn't have the power to go up hill,it will not go over 45 on hwy,bought,controlvalve,EGRvalve,TPsensor,and in tank!

Check for vacuum leaks. Hissing usually indicates a vacuum leak. Check around the intake manifold and intake runners, pcv valve, vacuum lines, brake booster and anything else (air conditioner controls if you have automatic climate control) that runs on vacuum. A hiss that is louder inside the car is usually caused by either a brake booster leak (closer to driver side) or the air container controls (closet to the center console). Good luck.

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My HVAC heater blend door actuator stopped working, so I took out the old actuator and connected a new one to test. But even with the new actuator I am getting no response. I read that some cars have a...

climate control cars best let dealership fix because it is electronic device with sensors check fuses and relay check for leaking vacuum hose if you hear hissing noise if no make sure system getting vacuum all depends on vechicle type most newer vechicle all air doors actuator control by EATC MODULE.which is dealing with electronics all actuators electrical controled.

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Usually a sign of a vac leak in one of the hoses at the controller.

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Under acceleration there is a loud hissing/suction sound as if there is no air filter on the motor.

If the hissing is coming from under the hood,you have a vacuum leak at one of the hoses,EGR valve on top of the engine, or a hose off someplace like the line going down to the transmission. An easy method to check where, is toget a can of spray starting fluid, and spray a tiny bit in a few places around the engine. When you hear the engine rev up,your very close. If the hissing is inside the cabin, check the hoses at the climate control or the blend air door motors.

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My mazda 6 is idling and shuts off, and there is a hissing sound coming from the engine you can hear it just can't find where. This all started when the hissing began. I found 3 hoses cracked and I...

You still got a vacume leak, best chk. all your vacume hoses paying close attention to the one that goes to your break booster, it also could be an intake gasget, You can chk. that by spraying a little WD-40 around the intake and vacume lines while its running if it reves up than thats where your leak is, not a whole lot you don't want to start a fire.

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you probably have a vacume leak leading to vacume advance to listen for a vacume leak take a piece of garden hose @3 ft long stick one end to ear and the other end arround the distributer cap with the enging running it will saund like a hiss if you hear it replace the hose. which you can get at any auto parts store

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Vacum leak ? air comes from vents when driving when not turned on

sounds like your blend door is loosing vacum check for melted or disconnected vacum hoses (most are plastic) the blend door is controled by one black and one black w/green stripe. As for the e break check for connection or cracked or worn hose end

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The leak is from the Vacuum Motors on the Air Distribution Box for the Climate Control system. Please go back to your transmission and check it for Trans Fluid in the Vacuum line going to the Trans Vacuum Module. The Module will be on passenger's side of trans near the Trans Pan, there may be a shield covering it. Pull the line off the module & see if fluid comes out

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If you see fluid at the rear of the master where it attaches to the power booster then the cylinder itself is leaking. It's not often that the container leaks.
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