Thanks for the response. Being a gas class A, means that it has a motor at the front which helps rule out the long run of hoses from the rear which would be expected from a diesel pusher. So we can now expect that the hoses are shorter and less likely to be kinked and restricting the flow of coolant to the heater core. There should be two hoses going to the hearer core, feel of those hoses and expect at least one of those to be pretty warm once your temperature gauge is at operating range. If this test is good, then the next step is to check the door that allows heat from the heater core to enter the evaporator chamber and then pushed by fan into the cabin. The door is usually operated by a vacuum valve on a gas model the vintage of your coach, some are operated by an electric solenoid. If the door is not opened up you could be blowing cold air. Most vehicles of your coachs age have temp gauge, what does that gauge show?
a/c heater
in Electrical
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temp gauge does not move