Why would heater in a1996 Volvo 850 stay running even when car is shut off?

If the heater in a 1996 Volvo 850 continues to run even after the car is shut off, it may be due to a stuck relay or a malfunctioning climate control system. Another possibility is that the heater core is still receiving coolant circulation due to a faulty valve. Additionally, electronic issues or a problem within the vehicle's wiring could lead to the heater operating independently of the ignition. It's advisable to inspect the relays and the climate control module for faults.