Question about Chevrolet Corvette

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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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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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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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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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Vacuum leak in dash- 97 areostar..


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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.
The hissing noise is very likely coming from the power booster. This must be replaced. If cruise has a vacuum hose that connects to hose to booster it's possible that vacuum loss at booster is causing the cruise problem.If you are going to do the booster, have a good tech take a look at it first. they are expensive and you don't want to change it on my advice alone...I'm not there and can't hear it!

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hi its definatley an air leak if you have replaced the hoses i suggust the next thing you try is see by tighting the carburrettors nuts that hold it to the manifold as these come lose and **** air do the same with the manifold bolts i suspect you will find them loose if not then change the gaskets one at a time with the cheapest first the carburretors then the manifold you may want to go to your car shop and ask for an air leak spray or they may use some other kind of method but basicly you spray it round the carb/manifold and watch to see where the leak is yates210456

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