Radiator Fan Resistor Test

October 11, 2024 Post a Comment

Radiator fan resistor test

Together make sure we have continuity. So we're going to check between this terminal. And the

What does a radiator fan resistor do?

The purpose of the cooling fan resistor is to remove heat from the engine's coolant and from the A/C refrigerant. The resistor does this by drawing air through the radiator and air conditioning condenser.

How do you test a radiator fan with a multimeter?

How to Test Radiator Fan with Multimeter

Locate the fan on your car.
Remove the fan motor connector.
Identify the terminals that supply current to the motor.
Set the multimeter to read volts by moving the rotary switch.
Connect the multimeter probes to the terminals on the connector.
Check the multimeter.

How many ohms should a radiator fan have?

A good motor should read less than 0.5 ohms. Any value greater 0.5 ohms indicate trouble with the motor.

How do you know if a fan resistor is bad?

Here are some common signs that your vehicle's blower motor resistor is bad:

Loss of HVAC fan control (total or certain speeds)
The fan only works on its highest speed setting.
No air coming from vents.
Intermittent or inconsistent fan speed.

How can I tell if a resistor is bad?

If the resistor is fine, the multimeter will show its value in Ω, kΩ, or MΩ. However, if the resistor is bad or damaged, the multimeter may display 0 or 1. If the value 0 is displayed, the resistor is damaged, and the current can't pass through.

What happens when the blower motor resistor goes out?

Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor. A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will be left with no air coming from the vents.

Does a resistor control fan speed?

The fan speed can be changed either by switching the blower resistor resistance mechanically using a rotating lever, or electronically by the air conditioning system. The change in resistance then limits the current through the motor, which dictates the speed at which the blower fan operates.

What causes blower motor resistor failure?

In most cases, the blower fan resistor is failing either due to overheating or corrosion. If the blower fan fails, your car will not blow any forced air. However, sometimes the problem can be with the blower motor itself. This is especially apparent when you have replaced the blower fan multiple times.

How do I know if my radiator fan relay is bad?

One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly.

Should a fan motor have continuity?

Each phase to phase must have a continuity if winding is OK. If any particular phase fails the continuity test, your motor is probably burnt.

Should radiator fans spin freely?

If there is no clutch, the fan would be difficult to turn because you would have to turn the fan and the pulley, which are turned by a belt. If the fan is turning freely with no clutch, then there is a problem with either the belt being loose or the pulley will need adjustments.

How many ohms should a fan relay have?

Problems In The Cooling Fan Circuit A good relay coil will typically read 40 to 80 ohms. If resistance is high, the coil may still be working, but it is failing; or it may not work when electrical loads are high. If the coil has no resistance, it is open and has failed. Replace the relay.

How much resistance does a fan have?

From these measurements the effective resistance of the fans was determined to be 37.9 Ω ± 3.2%. The effective resistance was consistent within 5% across all fans, which is comparable to the tolerance of a standard carbon resistor.

How do you Ohm a fan motor?

So due to some slight wind we have the condenser. Fan slowly rotating. So we're on the first two

Does a blower motor resistor have a fuse?

A fuse is often located on the resistor board. The fuse only protects the low and medium blower speeds. High speed will still work if the resistor fuse is blown.

Why would a fan not work but the light does?

If your ceiling fan stopped working but the light still works, check for a humming sound. This could be indicative of a blown motor capacitor, which is often caused by overheating. While inspecting the motor housing, look for a small black box connected to the pull cord.

What happens when a resistor fails?

This can have several consequences. The resistance value can shift permanently, the lifetime can be significantly reduced, or the resistor is completely damaged resulting in an open circuit. In extreme cases the excessive power can even melt or catch on fire.

Can you test resistors with a multimeter?

Pick out a random resistor and set the multimeter to the 20kΩ setting. Then hold the probes against the resistor legs with the same amount of pressure you when pressing a key on a keyboard. The meter will read one of three things, 0.00, 1, or the actual resistor value.

Can you test a resistor without removing it?

If you suspect a bad resistor is at the root of your electrical problems, you can conduct a simple test with a multimeter without ever removing the resistor from the circuit. Connect the black and red probes to the proper terminals on the face of the multimeter.