The heater matrix is enclosed in the heater box casing located behind the dash .Very little of it can be seen.The heater fan is located behind glovebox,access from pass footwell.The fan speed resistor is located at the top of the fan blower casing and access is from the engine bay,rear bulkhead area ,near wipers.There is usually a plastic cover over the scuttle panel.This is for a manual control system.The semi auto system is slightly different in as much as the fan speed controller is by the blower motor.hth
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