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What year is your vehicle? It could be a control cluster, or "brain" as it is often called, which is directly behind the AC?Heater control knob. This would require removing much of your dashboard which is NOT a enjoyable experience! Peace. God bless.
have the thermostat checked for correct operation. Ensure the coolant system is full and pressure bleed to remove any air locks. Ensure that the heater control is working as if they are not used for long periods of time they tend to rust/jam up or the vacuum actuator line leaks.
to change the coolant in any engine you need to firstly remove the bottom radiator hose when the engine is cold not when the engine is hot and drain the whole system. You then need to get some coolant from your local supplier and it will tell you on the container the proper ratio of water to cool it. Once you have put to cool it in top up the system with clean water.Regards