A/C Not Cold and Bad Smell – Ford Mustang 2020
The A/C blows cold on the highway but gets warm in traffic, accompanied by a bad smell. This suggests a refrigerant issue, possibly a low charge or a failing compressor, with the smell indicating mold or a failing component.
Diagnosis Details
Possible Causes
Low refrigerant charge due to a slow leak, causing reduced cooling at idle but adequate cooling at higher RPMs.
Faulty A/C compressor clutch or compressor failure, leading to intermittent cooling.
Clogged or dirty evaporator core causing poor airflow and bad odor from mold or bacteria.
Faulty expansion valve or orifice tube restricting refrigerant flow.
Related OBD-II Codes
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What You Should Do
Check refrigerant pressure with a manifold gauge set; if low, locate and repair the leak, then recharge.
Inspect the compressor clutch operation and evaporator drain for blockages.
Clean or replace cabin air filter and consider an evaporator cleaning service for the smell.
Related Repairs
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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.
