A/C Not Cold and Smells Bad
The A/C 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. The smell suggests mold or mildew buildup on the evaporator core.
Diagnosis Details
Possible Causes
Low refrigerant charge due to a leak (common in Ford F-150s around 3-5 years old). The system cools initially but loses pressure as it runs.
Failing A/C compressor clutch or internal compressor failure. The compressor may engage at first but then disengage or lose pumping efficiency.
Clogged or dirty evaporator core causing poor heat exchange and bad odor from mold/bacteria growth.
Related OBD-II Codes
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What You Should Do
Have the A/C system inspected for refrigerant leaks (dye test), check compressor operation and clutch engagement, and clean or treat the evaporator for odor.
A professional A/C service is recommended.
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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.
