Hissing noise coming from dash when A/C running?

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01-31-2010, 08:32 PM

ThePOWERtoRULE

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Location: Pacific Wonderland

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Year: 2001

Model: Cherokee

Engine: 4.0L

Hissing noise coming from dash when A/C running?

Whenever I turn on the A/C or Defroster (runs the A/C compressor as well) I hear a loud hissing coming from the passenger side of the dash. Much louder than the noise of the vacuum controls of the HVAC. Sounds like a HUGE vacuum leak. But the idle doesn't rise or fall, so it shouldn't be a vacuum leak of that magnitude?

Does this mean that the evaporator core is leaking??

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02-01-2010, 02:11 AM

djritter1122

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Year: 1997

Model: Cherokee

Engine: 4.0

...........

i do commercial a/c and ive done my own. get one of those autozone a/c gauges and check the pressure. its cold out so it can seem low. but it will help. the a/c comes on with everything but cabin vents. come on with feet,windsheild, and mix. then of course a/c and high a/c. if you have a vac leak it right by the floor pass side is the blend door with an vac acuator.

well maybe not cold for you didnt see you were in ca

Last edited by djritter1122; 02-01-2010 at 02:11 AM. Reason: added info