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2004 sub baja. When I run the ac sometimes a noise that sounds like a horn comes from the middle of the dash. it comes and goes and lasts a few seconds up to ten seconds. At times the belt will squeal at the same time the noise starts when the compressor kicks in but not all the time. I shut the ac off the noise stops if I shut the car off when its making the noise it continues and slowly fades away. Any Ideas
 

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system overfilled with refrigerant. makes the H tube/w'ever 'hoot' as fluid instead of gas passes thru it. Not good.

'Best' to have an a/c shop recover the refrigerant and install the recommended volume.
 
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