2005 Volvo V50 Heater Is Not Working? RepairPal will help you figure out whether it's your Heater Blower Motor, Thermostat, Heater Blower Motor Resistor, or something else. 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. 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. 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 most common reasons a Volvo V50 heater isn't working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor. 0 % 31 % of the time it's the Heater Blower Motor 0 % 24 % of the time it's the Thermostat 0 % 18 % of the time it's the Heater Blower Motor Resistor 0 % 27 % of the time it's 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. .

volvo v50 heater not working