There are a number of reasons as to why the heater has stopped working on Your Ford Focus. From complexAnd serious issues, like a failed BCM, to simpler things like a blown fuse, a variety of malfunctions can cause the fan to stop working. That being said, the most common reasons as to why the heater stops working. These include a blown motor, thermostat failure due to electronic or interface configuration errors and a blown resistor within the heater. All of these issues can be somewhat tricky to fix, but entail replacing a part upon failure. If the thermostat is failing due to a software problem, Youll need to take the car to a dealership or technician to get it sorted.
Jerry S.
April 10, 2020
While your ford focus heater may not be working for a variety of reasons, the most likely 3 are a broken heater blower engine, a thermostat malfunction, or a failed heater blower motor resistor.
If it was like mine, the heater would work for a bit then blow cold.It was an airlock in the coolant system which i fixed by opening the expansion tank filling to max with coolant and putting the cap back on .Then start the car let it idle for a few minutes to warm up, then hold at 3500 rpm for 30 secs then idle for 30 secs then switch off for 1 minute.Turn back on and repeat holding the revs at 3500 rpm etc for 4 or 5 times till the heater blows hot at idle.This forces the airlock out of the pressurised system.
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