Loud hiss!!!!

bwv2k

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I have a 01 ls v6 which I changed the radiator in recently. Aside from having a no heat issue now I am getting a loud hiss when I turn the heat on. Oddly enough, it only hisses when I turn the ac button on. If I turn it off the hiss stops. Anyone know anything about this?
 
I suppose it might be a symptom of low refrigerant level. Maybe something you did while changing the radiator caused a small leak at the condenser?
 
how about trying to narrow down where the hiss is coming from, under the hood, under the dash...
 
the hiss is coming from the center vent in the car. If I switch the ac button off the hiss stops. Check refrigerant level and it's good.
 
Does it hiss only when the compressor is on??
 
Theres your culprit.

Flush the system and replace all the ac components.
 
Sounds like a blocked orifice tube unless ls's have expansion blocks. Same thing though and probably the problem.
 
Im not too sure but it may be something to look in. Your car has an auxillary water pump to help with the heat. It could be on its way out.
 

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