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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[BillB128]

Seems odd since the blower is working and you're able direct the airflow. Perhaps it's s sensor that is preventing coolant flow through the heat exchanger. Thankfully it's a warranty repair, especially since it's not cracking 20 deg F in NJ today.

You probably tried it over the course of the trip, but did try cycling the ignition on and off to see if that made a difference?

 

[carl3pedals]

Seems odd since the blower is working and you're able direct the airflow. Perhaps it's s sensor that is preventing coolant flow through the heat exchanger. Thankfully it's a warranty repair, especially since it's not cracking 20 deg F in NJ today.

You probably tried it over the course of the trip, but did try cycling the ignition on and off to see if that made a difference?

Yes - I actually had 3 legs to the trip yesterday - 1st and 3rd legs were each over 3 hours. And the problem is still there this morning, for two short trips today.

 

[BillB128]

Sure seems like something is keeping coolant from traveling through the heat exchanger.
Hopefully it's an easy fix once you get it to the dealer.

 

[Frenzal]

Sure seems like something is keeping coolant from traveling through the heat exchanger.
Hopefully it's an easy fix once you get it to the dealer.

Isn't this the role of the thermostat?

 

[BillB128]

Similar, but different. The thermostat controls the coolant flow to the radiator. When the thermostat is closed, coolant is circulated around the engine's water jacket and bypasses the radiator, allowing the engine to reach operating temps more quickly. Once the engine is up to temp, the thermostat begins to open and coolant circulates through the radiator, helping to keep the engine at the correct temp.

The heat exchanger (also called heater core) is like a mini radiator that is buried in the dash. When you turn on your heater, coolant flows through the exchanger and a fan blows across it producing warm air.

It's possible that the thermostat is stuck open so the engine is not truly getting up to temperature in this cold weather, but I think if this is the scenario, the OP would be getting some heat into the cabin, but not as much as he would want.

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