AC Symptom Checker
People search symptoms, not services. Match what your car is doing to the likely cause, the fix, and what it costs at a community garage in Phoenix — then book a $20 diagnosis for the real answer.
Likely cause: Usually a slow refrigerant leak — dried-out O-rings, a seeping Schrader valve, or an aged line fitting. Sometimes a compressor clutch that never engages.
The fix: Pressure test both sides, find the leak with UV dye if needed, replace the seal, then evacuate and recharge to your vehicle's exact factory capacity.
What it costs here: $20 diagnosis + $50 repair reservation
Likely cause: A system that's low on refrigerant, or a condenser that can't shed heat when there's no airflow. Occasionally a weak cooling fan that only matters in traffic.
The fix: Gauge readings at idle vs. 1500 RPM tell these apart. Low charge gets the leak found and fixed; a dusty condenser often just needs a careful rinse.
What it costs here: $20 diagnosis + $50 repair reservation
Likely cause: Almost always the blower resistor pack — the little circuit board that creates the lower speeds. The motor itself is usually fine.
The fix: Test the resistor, replace it if the lower speeds are dead. Most vehicles are done in about 30 minutes.
What it costs here: $50 reservation + the part at cost
Likely cause: The blower motor itself — especially if you hear a scraping or clicking from the dash on the highest setting. Sometimes a fuse or a seized cabin filter that choked the motor.
The fix: We test power at the motor and the switch before replacing anything, so the right part gets ordered the first time.
What it costs here: $50 reservation + the part at cost
Likely cause: Classic low-charge behavior: the evaporator freezes up while driving, thaws when you stop, and repeats. Can also be a cycling pressure switch cutting out early.
The fix: Gauges show it immediately. The leak gets found and sealed, and the system gets recharged to spec so it stops freezing.
What it costs here: $20 diagnosis + $50 repair reservation
Likely cause: Mildew growing on the evaporator — Arizona's monsoon humidity feeds it, and a clogged evaporator drain keeps it wet.
The fix: Check and clear the drain, treat the evaporator with an antimicrobial cleaner, and replace the cabin filter. No refrigerant work needed.
What it costs here: $20 diagnosis — often no repair slot needed
Likely cause: Usually normal — that's refrigerant pressure equalizing through the expansion valve. But a constant hiss with the AC running means the system is venting refrigerant from a leak.
The fix: If the hiss is momentary, nothing is wrong. If it's constant, the diagnosis finds the leak before the system runs dry and damages the compressor.
What it costs here: $20 diagnosis
Likely cause: A compressor clutch with too much wear in it — the gap grows, the clutch slips and chatters before it grabs. Left alone, the slip turns into clutch and compressor failure.
The fix: Measure the clutch gap and test engagement. Caught early, the clutch can be shimmed or replaced without touching the whole compressor.
What it costs here: $20 diagnosis + $50 repair reservation
