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No, that's not normal. Is the AC coming on? Is the AC "snowflake" off?

There's a temperature sensor in the heating coil. The system is designed to stop coolant from flowing through the heater coil if the coil temperature gets too high. I've seen a couple of posts where the owner replaced the sensor and the heat started working properly. Also, there's a cabin air temperature sensor in the climate control module. That could be going bad.
 

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I'm not familiar with inpa software but it may be able to check that sensor. You might find someone with the same model year car and swap IHKAs to see what happens. You could shotgun it and replace the sensor. Unfortunately realoem doesn't show that sensor. It doesn't show the AC evaporator temp sensor either. Check with the dealer.
 
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