climate control problem: no heat

[carl3pedals]

I went for a several hour long drive today in my 2023 Integra Aspec with 6 speed stick. I was about 30 minutes into the drive when I realized I was not getting any heat. The air blowers are working fine, whether set to defrost the front windshield, or set to direct air at both chest-level and feet-level, or set to only send air to my feet. And each of the two legs of my trip today were over 3 hours of highway driving, and the engine was working fine, so I am sure the eingine was producing enough heat.

Can anyone suggest anything I should look at to troubleshoot this?

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