When I reconnected the controller to the four prong plug under the dash and check the output to the fan at the two prong connector I get a steady 12 V regardless of whether the fan switch is on or not, and even if the key isn't even in the ignition. If I then plug the fan back into the controller it doesn't spin and I get 0 V at the fan terminals. Check if there's fuel in fuel lines. Tank level sensor can be stuck so you might empty it dry and not even know it You have broken vent flap servos or just need calibration with Volvo diagnostic tool. If both heater hoses are hot, and the radiator is full of coolant, it may be a blend door problem under the dash. Why is my volvo heater not working? A volvo heater core is a small radiator (matrix) that transfers heat from the engine-cooling system to your car's air heating/ventilation system. The heater core is much smaller than the engine-cooling radiator in front of the engine. read on to learn more about how to replace a faulty heater core in a Volvo. The signs are relatively simple. In the event that your heating turns and does not create very little heat, the problem probably comes from the hoses. These clog up over time and no longer allow hot water to reach the heating of this Volvo V50. In this situation, clean the hoses or put new ones. Air pocket in the circuit of the Volvo V50 0:00 / 9:29 Volvo Webasto problems / Volvo diesel heater not working Fix Madman Car 16.4K subscribers Subscribe Subscribed 69 Share 48K views 2 years ago volvo webasto diesel heater xc90 The MCC, manual climate control will have a fan speed switch with 4 speeds and the temperature control ***** go cool to hot. The ECC, electronic climate control will have a slider for infinite fan speeds and the temperature control ***** will have numbered temperature selection. Attached Thumbnails. .

volvo v50 heater not working