2021 Suburban no rear heat

[mannyp02]

2021 Yukon Denali XL owner here and I've experienced the same issue throughout ownership (vehicle purchased new). Happens when using remote start (front vents blow hot air, rear vents blow cold like AC) as well as during standard use. Sometimes turning the rear climate off and then on will fix it but generally not. I'm going to ask at my next service but wondering if anyone is aware of a solution?

 

[SavageDad]

2021 Yukon Denali XL owner here and I've experienced the same issue throughout ownership (vehicle purchased new). Happens when using remote start (front vents blow hot air, rear vents blow cold like AC) as well as during standard use. Sometimes turning the rear climate off and then on will fix it but generally not. I'm going to ask at my next service but wondering if anyone is aware of a solution?

Any updates?

 

[WalleyeMikeIII]

Any updates?

Almost sounds like a low coolant issue to me. Do you have enough coolant in the system?