How To Diagnose Common A/C Condenser Fan Problems

Check car air conditioning system refrigerant recharge

The condenser fan is a critical component of the A/C system. It ensures that your vehicle’s A/C will blow cold air when it is turned on. A broken condenser fan can be disastrous for your car’s engine. It can lead to overheating, which can damage different components and result in an expensive engine repair. Read on to discover ways for diagnosing some common A/C condenser fan problems.

How to Detect Common A/C Condenser Fan Issues?

If you experience reduced A/C performance, strange noises, or the engine overheats while stopped, you may have a condenser fan problem. Check the repair manual for your particular YMME (year, model, make, engine) for information on how they are triggered. This can assist you in troubleshooting some of the most common condenser fan issues.

Relays and Fuses

The first step in troubleshooting any electrical issue is to look for power issues, starting with the wiring, relays, and fuses. Use a multimeter to check for short circuits in the system before replacing a blown fuse. Relays can be regularly tested by replacing them with top-notch component relays like the ABS or horn.

Refrigerant Level

The temperature sensor cannot detect refrigerant temperature if it is not immersed in coolant, like in an air pocket or at a low refrigerant level. Check for leaks and regulate the refrigerant level.

Temperature Sensor

The fan won’t turn on if the temperature sensor is broken. By disconnecting the sensor and placing a jumper wire across the connector, you can easily check the switch’s operation. If the fan turns on, the sensor could not be working properly. Use a thermometer, multimeter, or OBD scan tool to confirm resistance or continuity against the actual temperature.

Fan Issues

Unusual noises are a solid sign that the fan itself is having issues. If it’s grinding, scraping, or wobbling, it might mean that the fan motor and fan blades are no longer attached.

Motor Issues

A short circuit or open circuit in a motor will stop it from running. A damaged motor can be detected by a blown fuse. Disconnecting the fan and examining the terminals for resistance is the simplest approach to verifying this. If the multimeter displays, ∞ Ω, 0 Ω, or OL Ω replace the motor.

Resistor Troubles

To support varied fan speeds or activation levels, certain cars utilize a fan resistor pack. This may also be readily verified by unplugging it and verifying with a multimeter. Verify the resistances in accordance with the repair manual, and as a general rule, any open circuit that reads “OL Ω or ∞ Ω” fails the test (over limit).

How Much Does It Cost to Replace an A/C Condenser?

The cost of replacing your car’s A/C condenser can vary based on the car model. Regardless of how you feel about it, the A/C also needs other parts to be fixed or replaced. For most automobiles, you have to spend between $400 and $900 to replace the condenser. Of this, approximately $200 to $400 should be devoted for labor and other components. It is not advised to replace your A/C condenser at home since the high pressure in the A/C system makes it potentially hazardous. Moreover, a specialized tool is required.

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