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Kenmore Central air conditioner not cooling properly

If your Kenmore central air conditioner is not cooling properly or is not blowing cold air, start with airflow. A clogged air filter or blower wheel can restrict air, cause the evaporator coil to freeze, and leave your home AC not cooling. Next, check the condensing unit's contactor, which may fail to send power to the outdoor components, followed by the dual run capacitor, which can make the fan motor noisy, cause overheating, or prevent the motor from running. If the blower motor is not receiving power, a faulty relay board or Kenmore main control board may be responsible, although the main control board is less common. If airflow is good, the evaporator and condenser coils are clean, and the blower, fan, and compressor run but the AC still blows warm air, suspect a sealed-system leak or restriction. Refrigerant diagnosis and any repair inside the sealed system require EPA 608 certification and a licensed HVAC technician. Testing or replacing a contactor, capacitor, control board, or relay involves electrical hazards, including 240V line voltage, so shut off power at the disconnect and circuit breaker and use a qualified technician when needed. Enter your model number to find the exact replacement part for your Kenmore central air conditioner.

01 - Kenmore Central Air Conditioner Main Control Board

If the central air condensing unit contactor is not receiving 24 volts or power is not getting to the furnace blower motor, a possible cause is a defective furnace main control board. While this is not a common problem, if all other potentially faulty components are working properly, the main control board should be replaced.
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Top Solution

02 - Air Flow Problem

Proper air flow is critical for the central air conditioner to work properly. The evaporator needs proper air flow to keep the condensing water from freezing. If the air filter or blower wheel gets clogged, ice can start forming on the evaporator coils, eventually freezing them up and preventing proper air flow. It is recommended to replace the air filter at least every 6 months or sooner depending on the conditions. Refer to owner's manual for guidance. Avoid covering registers with furniture, rugs, or other items that will restrict the air flow.
Top Solution

03 - Kenmore Central Air Conditioner Contactor

The furnace control board sends a low voltage signal to the contactor. When the contactor receives the signal from the control board, it closes the circuit, sending voltage to the condensing unit components. If the contactor is defective, it will not provide voltage to the condensing unit. To determine if the contactor is at fault, use a multimeter to test the contactor for continuity. If the contactor does not have continuity, replace it.
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Highly Likely

04 - Kenmore Central Air Conditioner Dual Run Capacitor

If the dual run capacitor is defective, the fan motor might be noisy, overheat, or not run at all. To determine if the dual run capacitor has failed, inspect the capacitor. If the dual run capacitor is bulging or leaking, replace it.
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Highly Likely

05 - Sealed System Problem

If the unit has good air flow, the evaporator and condensing unit coils are clean, the fan and compressor are running, and the furnace blower is on, but there is still not enough cooling, it is likely there is a leak or restriction in the sealed system. Since diagnosing and repairing a sealed system takes specialized tools and knowledge, a qualified service technician should diagnosis and repair the unit.
Highly Likely

06 - Kenmore Central Air Conditioner Relay Board

A relay board is often used to control components of an a central air condidtioner. If the blower motor is not receiving power, the relay board is likely the cause. A defective relay board will need to be replaced.
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Common

Frequently Asked Questions

Why is my Kenmore central air conditioner not cooling properly?
Why is my AC condensing unit not turning on?
Why is my condenser fan making noise or not spinning?
What should I do if my central AC has good airflow but still is not cooling?
How do I find the correct Kenmore central air conditioner replacement part?

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