Cooling System Repairs When Air Stops Blowing Cold
AC Repair in Eau Claire for Systems That Stop Cooling or Fail to Start
Gunderson Plumbing & Concrete LLC repairs air conditioning systems for homeowners in Eau Claire whose units stop cooling, fail to turn on, or blow warm air during summer heat. Common failures include refrigerant leaks that reduce cooling capacity, frozen evaporator coils caused by restricted airflow, and electrical problems such as failed capacitors or contactor switches that prevent the compressor from starting. Ignoring these problems leads to secondary damage, higher energy bills, and complete system shutdowns that leave your home without cooling during the hottest days.
The diagnostic process begins with checking thermostat operation, inspecting electrical connections at the condenser and air handler, and measuring refrigerant pressures to identify leaks or low charge. The technician tests capacitors with a multimeter, examines the compressor for mechanical failure, and inspects the evaporator coil for ice buildup or debris blockage. Once the problem is identified, repairs may involve replacing worn components, sealing refrigerant leaks and recharging the system, or cleaning coils to restore airflow and heat exchange efficiency.
If your air conditioner stops cooling your home or the outdoor unit will not turn on, contact us for AC repair service in Eau Claire.
You will see the technician test voltage at the disconnect box, measure amperage draw on the compressor, and attach manifold gauges to check suction and discharge pressures in the refrigerant lines. Low suction pressure combined with ice on the evaporator coil indicates restricted airflow from a clogged filter or blocked return vent, while low pressure on both sides suggests a refrigerant leak that must be located and sealed before recharging. Electrical failures often show up as a clicking sound without the compressor starting, signaling a bad capacitor or contactor that needs replacement.
After repairs, you should notice the system reaching thermostat temperature within a normal cycle, the outdoor fan and compressor running without unusual noise, and cold air flowing steadily from supply vents. Refrigerant repairs include leak detection with electronic sniffers or UV dye, brazing the leak point, pulling a vacuum to remove moisture, and refilling the system to the manufacturer's specified charge weight.
The service does not include ductwork repair, thermostat replacement, or air handler motor rebuilds, though the technician will identify these issues if they contribute to cooling failure. Some parts may need to be ordered if the system uses older components no longer stocked on service trucks.
What Happens During Diagnostic and Repair Visits
Questions Homeowners Ask About Air Conditioner Repairs
Homeowners dealing with cooling failures often ask what causes ice buildup, how refrigerant leaks develop, and whether repairs are worth the cost compared to system replacement.
What causes an air conditioner to stop cooling during summer?
You lose cooling when refrigerant leaks reduce system charge, the evaporator coil freezes due to restricted airflow, or electrical components such as capacitors and contactors fail and prevent the compressor from running. Dirty filters and blocked return vents are common causes of airflow problems that lead to frozen coils.
How do technicians find refrigerant leaks in AC systems?
Technicians use electronic leak detectors that sense refrigerant gas, inject UV dye into the system and scan with a blacklight, or apply soap bubbles to suspected leak points such as line set connections and valve cores. Leaks most often occur at brazed joints, flare fittings, and the evaporator coil where vibration and corrosion weaken connections over time.
Why does my air conditioner freeze up in hot weather?
Your evaporator coil freezes when airflow drops below the level needed to absorb heat from the refrigerant, causing the coil temperature to fall below freezing and ice to accumulate. Restricted airflow results from clogged filters, closed supply vents, or blower motor failure, and low refrigerant charge also lowers coil temperature enough to cause icing.
What does it mean when the outdoor unit hums but does not start?
You hear humming without startup when the compressor tries to run but the start capacitor has failed and cannot deliver the voltage spike needed to overcome initial resistance. The contactor may also be stuck closed, sending power to a seized compressor that cannot turn, or the compressor itself may have failed internally and need replacement.
How do I know if AC repair costs justify fixing an older system?
You should consider replacement instead of repair if the system is older than 12 years and the repair cost exceeds half the price of a new unit, or if the compressor has failed and the system uses R-22 refrigerant. Frequent repairs over consecutive seasons also indicate the system is reaching the end of its service life and replacement will be more cost-effective.
Gunderson Plumbing & Concrete LLC provides AC repair services for homeowners in Eau Claire who need fast diagnosis and reliable fixes to restore cooling during summer heat. Call us to schedule a repair visit when your system stops working or fails to cool effectively.