Why do my heater controlls hiss at me?
#1
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Why do my heater controlls hiss at me?
When I first turn on the heat or anything, the controls hiss for a while them goes away. Why is this happening and is it fixxable?
#2
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In most cases, this is normal. The heater controls work using engine vacuum. What you're hearing is the bleed-off as you move the selector lever.
#4
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It shouldn't hiss constantly. You can pull the controls to make sure the hose harness is still plugged in securely. It might be coming from one of the door control diaphrams too.
#6
I can help you bro.
Take out your controls and on the back in a port with I think 5 vacuum lines going to it. That little port might be leaking, Did mine last year and its cheap ( like 12 bucks)
I'll get you the Factor-Air part # tomorrow.
Peace
Take out your controls and on the back in a port with I think 5 vacuum lines going to it. That little port might be leaking, Did mine last year and its cheap ( like 12 bucks)
I'll get you the Factor-Air part # tomorrow.
Peace
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Sweet, I appreciate it Keith - I guess that could be why I'm stuck with just a defrost mode; not enough vacuum to move it to the dash vents or foot well vents. I'd appreciate the part number if you can find it!
Steve
Steve
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#12
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finally , we habe a thread about this !
I need ot know which of the line son the control panel is the main feed from the engine, i have no vacuum at all on my Z28, its stuck on everything, vents defrosts, floor, everything, no vacuum hiss sounds at all , ever, its dead.... lol if I knew which hose feeds the panel then i could check at the carb/intake to see what happened, and also at the panel.
thanks
I need ot know which of the line son the control panel is the main feed from the engine, i have no vacuum at all on my Z28, its stuck on everything, vents defrosts, floor, everything, no vacuum hiss sounds at all , ever, its dead.... lol if I knew which hose feeds the panel then i could check at the carb/intake to see what happened, and also at the panel.
thanks
#13
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Mine does it too, has been since the vaccuum control thingie on my old heater control busted. I got another one from a car my buddy was parting out, and since then it has been hissing and hanging up on defrost. I think it's because the vaccuum lines were old and hardened and didn't seal to the 'newer' setup very well. I can get it too change though, if I go to a/c first for a few seconds and wait till it changes, then change to vent, then heat. Evidently the a/c has stronger vaccuum or a different setup for vaccuum than everything else. I'm going to try sealing the vaccuum lines better before I buy a new module.
#15
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Oh man! That all makes sense! It feels like I may have a vacuum leak, and my heater controls hiss like a snake about to strike!!! Now, just to fix it! To those who has endevored on this - how difficult is it?
#17
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Oh man - i dont suppose it's possible to remove controls w/o removing the panel under instraments is it? Damn, I woulda had it all taken care of today, too....
#18
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its simple to remove the that panel around the controls and radiom, justa few screws in a minute or two, and its off, easy, not putting mine back on til radio is in and controls have vacuum sounds like theyre supposed to...
good luck
good luck
#20
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I replaced the entire control unit and moved parts around to get a good rotary control valve, BUT it is still stuck on defrost. What's up? Where does the engine vaccum come from. Recently redid the intake gaskets, maybe I forgot to hook something up. Help Please!!
#21
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Like I said before, I'm not so sure the vaccuum rotary selector is bad at all so much as I think the vaccuum lines themselves have hardened over time and no longer are pliable enough to properly seal. Maybe something as simple as a little bit of silicone or glue around the nipple on the rotary selector would cure the problem. That's what I'm going to try first, when I get around to it.
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