That's a lot like the '07 Tahoe.. probably all of them since too. Those 4 lines are a pain! The connectors on the heater get stuck. Busted both lines at the back heater core. Busted both connectors on the front core. Good how to video!! We actually got rain today, 1/100" at 4am.. a little more a few minutes ago, but it didn't change the amount.... Dang expensive expansion valve! We just put compressors, expansion valves and receiver/dryers on 2 tractors..$350 each for everything..
