As we might know, Ford Ka heaters arent the best in the world, but mine, only has cold, its in full hot and the only time I feel warmth is if I close all the vents, and drive for a long time, where eventually they warm up and as soon as I open them and turn the fan up, you feel a brief warmth before it goes cold again, friends have said that it could be a blockage in the pipes, even though me and a friend unblocked the cooling which stopped my car from overheating, but I suppose the heater pipes are blocked, since its winter, would it be better to sort it out now or later? Since the garage said I need a new coolant tank soon too due to a few cracked around where the cap is

Blocked pipes or matrix, or your thermostat has jammed open, if temp guage hardly moves then its the stat

Blocked pipes or matrix, or your thermostat has jammed open, if temp guage hardly moves then its the stat

I replaced the thermostat when I did the cooling, and temp switch too, I would say its a blockage too, just need to find time to give it a flush, and anyway, my Ka has no temperature gauge, just a speedometer and fuel gauge

ah yes, just an overtemp light

ah yes, just an overtemp light

The garage said I needed a new temp switch since they said that could be why the fan doesn't turn on, it does now, but that was before I unblocked the cooling, like I mentioned it could just be a blockage in the heater matrixes

Try a reverse flush of the system, push any crap out the way it came in.

Just be aware that any flushing - either with water or chemical flushes could reveal any small holes in the system by unplugging them