The heater is not working
The heater is controlled by a 'variable solenoid water valve' that is controlled via the Air-conditioning module. These valves are prone to failure after a few years service. Another cause is if you have refilled the cooling system, the heater matrix sometimes airlocks, this can be overcome by bleeding the hose at high level by the heater hose in the engine bay.
Good luck -hope this helps
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