How to Test Car Ac Condenser Fan Motor

Last Updated on April 18, 2023 by Ryan

To test a car AC condenser fan motor, start by turning off the power to the system and disconnecting the negative battery cable. Then locate the fan motor near the back of the engine compartment and remove any debris that may be blocking its airflow. Once cleared, check for voltage at both terminals of the fan motor with a multimeter while also listening for any unusual noises coming from it.

If there is no power or noise coming from it, then replace it as necessary. Additionally, you can use compressed air to spin the blades manually and listen for any grinding noises which would indicate an internal problem needing replacement. Finally, reconnect all components before re-enabling power to ensure proper operation.

  • Turn off the car engine and remove the negative battery cable from the terminal
  • This will prevent any electrical power from running through to your fan motor while you are testing it
  • Locate the condenser fan motor under the hood of your vehicle and remove its electrical connector so that you can access it more easily for testing
  • Set a multimeter to measure voltage on DC current and test each connection of your car ac condenser fan motor by placing one lead on each respective contact point when checking for continuity in order to ensure there is no break in circuit between them, or else replace it if necessary
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  • Connect a 12V DC power supply to the positive (+) and negative (-) terminals of your car ac condenser fan motor in order to determine whether they are working as intended when placed under load, which should cause it to spin once connected properly with adequate voltage applied at its input points (usually around 6-12V)
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  • If all connections have been tested successfully then reassemble everything back together before turning the ignition key again so that you can check how well your newly replaced/repaired car ac condenser fan works within its designated environment!

Automotive HVAC Condenser Fan Circuit Testing

How Do I Know If My Ac Condenser Fan Motor is Bad?

If your AC condenser fan motor is bad, there are a few tell-tale signs you should look for. Firstly, if the air from your vents isn’t cooling as efficiently as it used to, or if the air conditioning unit makes unusual noises when it’s running, these could be indicators that the condenser fan motor needs to be replaced. Additionally, if you can detect an electrical burning smell coming from your unit or find that the area around your outdoor AC unit is unusually hot even after running for some time then this too suggests that something may be wrong with the motor.

In all cases it’s best to have a certified HVAC technician inspect and diagnose any issues before attempting any repairs yourself.

How Do You Test an Ac Condenser Fan Motor?

To test an AC condenser fan motor, you will need a multimeter. Start by disconnecting the power to the unit and then removing the access panel of your air conditioning system. Next, locate the two wires connected to your fan motor and use your multimeter to check for continuity between them.

If there is no continuity, this indicates that the fan motor has failed and needs to be replaced. Additionally, you can also perform resistance testing on each wire using a low voltage setting on your multimeter; if either wire shows more than 5 ohms of resistance, it’s likely that the fan motor should be replaced as well.

How Do I Test My Car Ac Condenser?

To test your car’s AC condenser, start by turning off the engine and disconnecting the negative battery cable. Next, locate the condenser in front of the radiator and check it for any visible damage or debris. Once you have inspected it, use a multimeter to measure its resistance by setting it to ohms (Ω) and touching each terminal with one of its probes.

The reading should be close to 0 Ω if there are no issues with the condenser. If not, then you may need to replace it as soon as possible before further problems arise.

How Do You Test a Car Fan Motor?

Before testing a car fan motor, it is important to make sure the battery has enough power and that all wiring is correctly connected. To test the fan motor, you will need a multimeter set to measure voltage or resistance. First, check for any visible damage on the motor itself and then connect the meter leads to each of the terminals on the fan motor.

With an energized circuit, if there is no reading (either voltage or resistance) this indicates that either there is a break in one of your connections or that your fan motor has gone bad and needs replacing. If you get readings from both terminals then this means your fan motor is working properly.

How to Test Car Ac Condenser Fan Motor


Car Ac Condenser Failure Symptoms

A car’s AC condenser can fail due to a number of reasons, including physical damage, electrical problems and age-related wear. If the condenser fails, drivers may experience warm air coming out of their vents instead of cold as well as loud noises when the AC is running. Other symptoms include strange smells emanating from the air vents or an unusually high temperature reading on the dashboard thermometer.

It’s important to have a qualified auto mechanic check your car if you suspect any issues with your AC system.

How to Test a Radiator Fan Motor With a Multimeter

To test a radiator fan motor with a multimeter, first set the multimeter to the AC voltage setting. Then connect one of the probes from the multimeter to each terminal in the fan motor. When you turn on your car, take note of what reading appears on the display for both terminals.

The reading should be similar; if it is not, then this indicates that there may be an issue with your fan motor and further investigation will need to be done.

Car Ac Condenser Problems

A car’s air conditioner condenser can experience problems over time due to wear and tear, or a buildup of debris. Common symptoms of a malfunctioning condenser may include strange noises when the AC is running, reduced airflow coming from the vents, or an increase in engine temperature. If you suspect your car’s AC condenser isn’t working properly, it’s important to have it checked out by a qualified mechanic as soon as possible.


Testing a car AC condenser fan motor is an important step in maintaining the performance of your vehicle’s cooling system. While it can be intimidating if you’ve never done it before, following these steps can help ensure that your car’s air conditioning stays reliable for years to come. With the right tools and knowledge, testing a condenser fan motor is a straightforward process.


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