AC Not Cold and Bad Smell – Chevrolet Silverado 1500 2020
The AC starts cold but quickly becomes warm, accompanied by a bad smell. This suggests a refrigerant leak, a failing compressor, or a clogged evaporator causing moisture buildup and mold.
Diagnosis Details
Possible Causes
Low refrigerant charge due to a leak (common at seals, hoses, or condenser)
Faulty AC compressor clutch or internal failure
Clogged or dirty evaporator core causing poor cooling and bad odor (mold/bacteria)
Expansion valve or orifice tube restriction
Related OBD-II Codes
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What You Should Do
Check refrigerant pressure with a manifold gauge set.
Inspect for visible leaks (oily residue).
If low, recharge with dye and monitor.
If compressor cycles off quickly, test clutch and pressure switch.
For bad smell, clean evaporator with A/C coil cleaner and replace cabin air filter.
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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.
