2021 CK2610SE Heated cab - No heat, only AC

[GSBoorman]

I was working my kioti the other day when the windows started to fog up pretty bad. It was strange because the AC was working, but no heat was coming out (it was 0c outside).

I checked the AC fuce to be safe, all good. I checked the tension on the compessor belt, all good. I checked to make sure the compressor engaged when HVAC turned on, all good.

Only thing I could potentially think of is a airlock in the HVAC system? The rad tank was just below the low line, so I'll have to top that up. However the engine never goes above 1/2 on the temp gauge.

Any ideas?

 

[LouNY]

Did you check the temperature in the heater hoses going into the cab. And depending on the circulation path low coolant could certainly hinder heater operation, for many years GM trucks wouldn't get heat into the heater if the radiator was low.

 

[GSBoorman]

I'll check out the hoses at the cab corner. I know it felt "warm" the other day, but not hot.