Lack of hot air when heating is on full-blast?

Hello! I was wondering if you can help me.

I recently got my Jimny back on the road and the heater was working fine until a few weeks ago when I noticed it won't put out hot air on anything above the lowest setting. The engine gets up to temperature normally, and apart from that it seems to run fine, AC is also ice-cold.

I suspect it may be the resistor in the blower motor as I've had this happen in the work's van before, and I believe this to be the problem

Any help is appreciated thank you !

I would look underneath at the little white levers on the end of the selector cables. Often the wire has come off

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Are these located on the left of the driver's side footwell?

And the right side of the passenger field as well.

Move the heater controls whilst looking down each side

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the levers move as do the corresponding knobs, but there's still minimal heat coming from the vents? It will de-mist the window though albeit slowly

How full is the coolant, is it going down? The heater matrix can be one of the first things to empty when there is a leak, especially if the leak is in the heater itself.