It sounds like the control head has a connection issues and needs to be checked to see if it has to be cleaned or replaced.
The lines run from the rear unit to under the passenger seat. These lines are sold as a pair and may also come with the heater lines as well. You can verify that with a gm dealer parts department. When you call, make sure you have the last 9 of your vin number so they can be accurate in there pricing. Be aware, they are costly and the labor is about 3-5 hours to replace them plus the dryer, orfice tube, coolant flush.
Monday, October 3rd, 2011 AT 1:04 AM