AC Not Cold and Bad Smell
The air conditioning starts cold but then becomes warm, accompanied by a bad smell. This typically indicates a refrigerant leak, a failing compressor, or a clogged/contaminated evaporator.
Diagnosis Details
Possible Causes
Refrigerant leak (low charge) causing intermittent cooling and possible mold/bacteria growth on the evaporator.
Failing A/C compressor clutch or internal failure leading to loss of cooling after initial operation.
Clogged or dirty evaporator core with microbial growth producing a musty or sour smell.
Related OBD-II Codes
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What You Should Do
Check refrigerant pressure with a manifold gauge set.
Inspect for visible leaks at hoses, compressor, and condenser.
If low, recharge with dye and monitor for leaks.
If compressor cycles erratically, test clutch and relay.
For bad smell, use an evaporator cleaner or 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.
