Hey, have had this hissing sound coming from the glove box area for a while now and has been getting on nerves lately.
So i had a leak on my low line in the engine area, had it taken to a shop, replaced, vaccumed and recharged. The AC worked, had a issue one or two days where the AC did not blow out the vents at all but was running, noticed there was a lot of frost on the bottom of the AC unit under glove box. After a while, the AC worked again and all was good, except for the hissing sound remained.

The AC seems to work fine, plenty of cold air but the hissing sound cycles on and off every so often. No frost again. Not really sure what it is exactly.

Anyone could suggest what to look at or what it most likely is? Thanks!!!

 

If you don't have a set of gauges either buy some and learn how to use them and ge the high and low side readings.....and the outside temp that will effect them.

If not, find an ac shop to help you out.

My guess, REPLACE/DO NOTHING on a guess. The expansion valve is flakying out.

 

so when it messed up and acted weird you didnt take it back to the shop and ask what was up? Whats the point of paying for work ?

 

I didnt want to take it back to the place, guy was kinda sketchy and little over priced.

 

Is it a hiss or a whistle ?

 

It's like a hissing noise that comes and goes. Not sure what to compare the noise to. If needed, I'll see if I can make a youtube vid soon or later