Question about 2005 GMC Envoy
Check to see that coolant hose going to the heater is hot. If not, may need to change the valve at the firewall to fix this common problem.
Posted on Jan 01, 2011
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Posted on Jan 02, 2017
With your front heat working the most likely cause for the rear heat not to work is that there is an obstruction in the line that is preventing the warm coolant to get to the rear heater core or the rear heater core itself is plugged and not circulating. Another possible cause could be low coolant level where the system has enough coolant to provide the front system with enought warm coolant but not the rear system. Hope this helps
Posted on Dec 30, 2009
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.
Posted on Feb 22, 2010
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