2015 GMC Terrain SLT2
Asked by Essa Dec 07, 2022 at 02:17 PM about the 2015 GMC Terrain SLT2 AWD
Question type: Maintenance & Repair
I have a 2015 GMC Terrain SLT2 with no heat. The actuator was replaced as
well as other parts that required the entire dash to be removed. The heat works
sometimes, when its cold and I rev the engine I get hot air. The thermostat was
changed as well, which slightly improved. The AC was recharged and all fluids
are fine. We are stumped
4 Answers
That is a sure sign of an air pocket. Take it back to where you had the work done and tell them, they had to drain down the cooling system to remove the heater box assembly but they didn’t recheck to make sure everything functioned correctly.
If heat works properly when you rev the engine, the radiator is low on fluid, the water pump is going out, or you have a blockage in the heater hose system which could bee a bubble of air, a collapsed hose, or other restriction. Try purging air from the system. There are videos online that can help you see how this is done and why it's important to do.
