AC Not Cold and Bad Smell – Ford Explorer 2020
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 core. The smell suggests mold or mildew buildup in the evaporator case.
Diagnosis Details
Possible Causes
Low refrigerant charge due to a leak (e.g., at compressor shaft seal, condenser, or O-rings). The system cools initially but loses pressure as it runs.
Failing A/C compressor (internal leak or clutch slipping). The compressor may work briefly then stop engaging, causing warm air.
Clogged or dirty evaporator core with mold/mildew growth, causing bad odor and reduced cooling efficiency.
Expansion valve or orifice tube restriction, leading to intermittent cooling.
Related OBD-II Codes
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What You Should Do
Check refrigerant pressure with a manifold gauge set.
If low, perform a leak test (dye or electronic).
Inspect compressor clutch operation.
Clean evaporator drain and treat with antimicrobial spray.
Replace cabin air filter if dirty.
If refrigerant is low, repair leak and recharge to spec.
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.
