Why does my car engine fan keep coming on?

Why does my car engine fan keep coming on?

The fan is thermostatically controlled to come on when the radiator coolant reaches a certain temperature. You car’s cooling system is probably compromised – either low coolant (due to leaks) or a thermostat problem or radiator issue.

Why does my cooling fan stay on all the time?

Cooling fans stay on at all times If the cooling fans are staying on at all times, this is another (less common) symptom of a possible problem with the cooling fan relay. If the relay shorts internally, it may cause power to be permanently switched on, which will cause the fans to run at all times.

Is the radiator fan supposed to be on all the time?

Most fans should come on when the coolant reaches about 200 to 230 degrees. An electric fan SHOULD NOT run all the time. The coolant may not be moving due to a water pump problem, blockage in the radiator or hoses, or a stuck valve, i.e., the “thermostat” in the coolant line.

How do you test a fan motor?

Unplug fan motor from control board and spin fan blade by hand to check for any resistance. It should turn/spin freely over 2 full revolutions. Always ohm fan motor when replacing a Main Control Board. When ohming fan motor use a meter that has ohm rating of 400k or higher.

How do I know if my fan motor is bad?

Signs and Symptoms of a Bad AC Fan Motor

1. The fan won’t start even though the AC is on.
2. The fan won’t stop, even when you shut the AC off.
3. The fan turns on, yet the blades are rotating very slowly.
4. There’s a rattling noise coming from the condenser unit when the fan is turned on.

What causes fan motor failure?

The main causes of failure are loss of lubricant, a failed run capacitor, a failed bearing in a belt drive, a little water dripping into the windings or a voltage problem. So technicians should carefully check to find the cause of a failure before changing the motor.

How do I know if my capacitor or fan motor is bad?

The fan won’t start even though the AC is on. The fan won’t stop, even when you shut the AC off. The fan turns on, yet the blades are rotating very slowly. There’s a rattling noise coming from the condenser unit when the fan is turned on.