my nissan xterra 2000 cab heater gives just like a warm breath but when i turn the A/C knob & button switch it works good. what could be the problem.
Sounds like you have a blend door that is sticking inside the heater box, something could be in the heater or a servo motor is going bad.
I brought it to the mechanic and the thermostat, fuse and rad cap was replaced, the heater vent still blows just a little warmer compared before. what could be the other possible mechanical or electrical problem of the heating system. the coolant level was right.
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