Auto Heating & A/C Repair in Frederick, MD

Reduced cooling or warm air — The system isn’t removing heat effectively. Common causes include low refrigerant from a leak, a weak compressor, or poor condenser airflow/fan performance.

Inconsistent cooling (drive vs. idle) — Cold while cruising but warm at stoplights often means low refrigerant, a weak radiator/condenser fan, restricted condenser, or marginal compressor output.

Unusual noises when A/C runs — Squealing, hissing, clicking, or rattling can point to a slipping belt, failing compressor/clutch or bearing, refrigerant leak, or blend door issues.

Check Engine Light with A/C on — A/C adds load to the engine. Fan, sensor, or control faults can trigger a CEL when the system engages; proper diagnosis requires a scan and pressure checks.

Weak airflow or foggy windows — Air isn’t moving through the vents as it should. Often a clogged cabin air filter, failing blower motor/resistor, or a stuck blend/recirculation door.

Fluid leaks or water pooling — Water on the passenger floor suggests a clogged A/C drain. Oily residue under the hood or on lines can mean a refrigerant leak; colored/sweet fluid can be coolant.

Ice on evaporator coils — Ice buildup indicates low refrigerant, restricted flow (orifice/expansion valve), or insufficient airflow across the evaporator; can damage the compressor.

Musty or unpleasant vent odors — Typically microbial growth on the evaporator or a saturated/dirty cabin air filter; a clogged A/C drain can amplify odors.