Sierra AC system intermittent hiss
July 14th, 2012, 11:45 PM
#1
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Sierra AC system intermittent hiss
I replaced my heater core on my 2000 GMC Sierra last fall and disconnected the AC line while I did it. I was careful not to purge the AC system during this time. I reconnected it and in the spring recharged the AC system. I have very cold air but know I am getting an intermittent hiss (like a pressure release valve is opening up) from under the hood on the passenger side. Only happens when the AC is on and I still have lots of cold air. Any thoughts?
July 16th, 2012, 9:32 AM
#4
Okay,
One of three things is going on and I'll list by order of probability:
You're overcharged with freon.
The filter (or some other component) is plugged.
The relief valve is actually bad (doubtful).
I'd guess that you have too darned much freon in 'er.
Allan
One of three things is going on and I'll list by order of probability:
You're overcharged with freon.
The filter (or some other component) is plugged.
The relief valve is actually bad (doubtful).
I'd guess that you have too darned much freon in 'er.
Allan
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