Heater does not blow hot air even if you turn it up to max.
Check to see if your car is getting to operating temperature, if driving and the engine is cooling down then it would be a thermostat. Another would be a plugged heater core, radiator flush may be in order, Then there is the out-side air blend door that controls inside cabin temperature may not be working properly due to a vent system actuator module.
u have to check the thermostat maybe it is not working and the thermostat sensor and u have to take a look on the tubes
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