The fans work but hot air does not flow.
If air comes out of the vents but it is not warm/hot, and your temp gauge shows normal engine temp, then the valve that opens the heater core to the hot water flow from the engine is not opening or the heat core is clogged. I would start there.
SOURCE: Heater blows cold, and fan switch only works on 4 and 5
working on 4 and 5 speed that the resistor that broken cold air you got to move the selector to see the motor that move the trap hot and cold sometime when the motor was not move to the hot side for a long time its jam the motor on the passager side under dash put to hot and gently tap the motor tanks pierre
SOURCE: No dashboard heat output
The climate control was poorly designed on these cars.
There is only heat on the floor and defrost settings, due to the layout of the ductwork.
SOURCE: 2003 Nissan Sentra Problem overheating and heater doesn't work.
I had this exact problem a few weeks ago. The repair shop first changed the thermostat. Didn't fix the problem. Next step, they found the radiator was clogged. They replaced the radiator and now everything works fine.
SOURCE: Remove and clean Toyota Echo heater fan.
The fan is under the pass dash, remove the glove box and you should see it, 1 plug and 3 8 mm screws.
Testimonial: "Thank you very much."
SOURCE: the heater control does not change the air flow to
Check any vacuum hoses from engine all the way to heater/a/c housing under dash,for leaks. Then manually move or put a vacuum guage on every vac motor you can see and get to. Your working your way back to the switch. If you want to you could start at the switch but % wise and degree of difficult your better to back in. Now a schematic will make the process easier. Hard to work on a system you don't know .Electrical or Computer sometimes play into these, I have an older S10 so no computer.
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