Tesla Model 3 AC Intermittent Weak Airflow and Odor
The AC system in your 2020 Tesla Model 3 is producing weak airflow with a bad smell, and the issue comes and goes. This points to a potential blockage or contamination in the evaporator or cabin air filter, or a failing blower motor or HVAC control module.
Diagnosis Details
Possible Causes
Clogged or dirty cabin air filter restricting airflow and causing musty odors
Mold or debris buildup on the evaporator coil, leading to poor cooling and bad smell
Intermittent blower motor failure or resistor issue causing weak airflow
HVAC control module or software glitch affecting fan speed regulation
Related OBD-II Codes
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What You Should Do
Start by replacing the cabin air filter (located behind the glovebox).
If the odor persists, consider an evaporator cleaning service.
If airflow remains weak, have the blower motor and resistor tested.
A Tesla service center can also check for HVAC software updates or control module faults.
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
