You say the car is at normal operating temp so I would check the blend door and see if it is opening and closing properly. You can move the temp lever quickly and listen for the door to slam. Also check the heater core for blockage feel the heater hoses the inlet hose should be hot and the outlet hose warm. If car is heating up to normal operating temp in a timely manner and gauge reads normal I doubt a thermostat.
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69 GTO Judge
69 Firebird Trans Am clone
76 Trans Am 400 4spd.
06 GTO M6 18's red/red - 1 OF 188.
09.5 G8 GT Stryker blue met. premium with sport pkg.
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