My rear heat in my 03 envoy blows cold air . the front works fine
There is a service bulletin for poor rear heat on these models.The bulletin number is 05-01-37-002A.The part numbers are 89024885 for 4.2 engine and 89024886 for the v8 engine.It is an auxiliary pump the helps the coolant flow to the rear.The a/c system has to be recovered so I don`t think you can do this at home unless you have an a/c recovery machine.Hope this helps.Good luck.
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