That’s where your heater core is located. I’d be interested to see if you have a coolant leak or maybe your gm coolant has plugged your core. If so that would imped your flow and cause heat to build up there more than usual.Approximately in this area, it tends to warm up quite a bit whilst driving.
I haven't paid enough attention as to whether it's only when the AC is on, or also warns up when the AC is off.
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Cousin has felt the heat twice now during our drives wondering if i had the heater on
Is it normal?