No Heat - '20 Bighorn 5.7 V8

[907.Tony]

Hello. The subject truck has ~50k miles. Air flow blows when the heat/AC system is turned on, just no heat at all. Initially, the reservoir for the coolant was low, topped that off and heat returned. A couple weeks later, no heat. Where would you all suggest the troubleshooting starts? Thanks in advance.

 

[Fatherof3]

Is the coolant low again ?

 

[907.Tony]

No, it's at the level it should be.

 

[Fatherof3]

You could try disconnecting the battery for 1/2 hour and see if the heat works then . Just keep in mind that if you do it’ll take awhile for everything to come back on line .

 

[Cbty2050]

Check coolant level in the radiator.