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Originally Posted by 72chevy
My 2000 Altima makes a strange sound and it's getting progressively worse.
With the AC on, at highway speeds, I can hear a loud SSsstt every few minuets. It seems to do it when the ambient air temps are higher. The sound started last summer and was really short but it has been getting longer and more frequent.
I took it to a service tech last summer and he said it had the proper amount of freon.
It cools good but when it makes the SSssst sound the blower seems to put out a puff of humid air. (I usually keep it on recirculate in the summer.)
Are there any tests I can do without a set of gauges?
Is there some kind of pressure switch going bad. I hope it's not the compressor.
Thanks in advance.
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I have always heard that sound you describe in my 01. My A/c worked great until 160k when the clutch went out. The hiss will occur for a few moments after the clutch has engaged.
If you have high miles the clutch may be going out (the electromagnetic part). The bad news is you will have to replace the whole compressor, as no seperate clutch is available.