Why is my trucks AC hissing?
Why is my trucks AC hissing? Hissing or Whistling But a persistent hissing or whistling sound could be a sign of a refrigerant leak. A refrigerant leak could occur in your refrigerant lines or in your internal valve. Leaky refrigerant lines could also make a bubbling sound. Why does my GMC air conditioner not work? GM air conditioning problems are caused by condensers and discharge lines, at least according to a proposed class-action lawsuit that includes the following long list of Cadillac, Chevy and GMC trucks and SUVs. This problem has popped up in the following GMC generations. Most years...