GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.I assume you are referring to the vacuum storage reservoir and the line to it from the engine as well as the line to the AC controller. If it was working and has now stopped then the first thing you need to do is verify there is a good vacuum supply to the controller. Post back with complete details and we can work from there.