S-10 & Blazer 1982-2005
The S-10 and Blazer was arguably the most versatile and accessorizable mid-size truck and SUV on the market.
Platform: S/T-series & GMT 330

1994 AC/Heater Panel Hiss

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Old Feb 19, 2011 | 1:29 PM
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PremiumSaltine's Avatar
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Default 1994 AC/Heater Panel Hiss

I just bought a 1994 S10 Blazer yesterday. The panel on the dash with the AC/Heater slider control makes a constant hissing sound. The sound changes when I move the slider up or down to select between Vent/Floor/Defrost/etc and it gets the loudest when it's on Off. The vents are stuck on Defrost too.

Could somebody point me in the right direction on how to fix this please? Thank you.
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Old Mar 18, 2011 | 8:26 PM
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Originally Posted by PremiumSaltine
I just bought a 1994 S10 Blazer yesterday. The panel on the dash with the AC/Heater slider control makes a constant hissing sound. The sound changes when I move the slider up or down to select between Vent/Floor/Defrost/etc and it gets the loudest when it's on Off. The vents are stuck on Defrost too.

Could somebody point me in the right direction on how to fix this please? Thank you.
sounds like a vacuum leak to me, you'll probably have to tear into the dash
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