Q: Engine fan continues to run, Check Engine light on, and coolant leaks.

asked by on December 18, 2015

Engine fan comes on about eight seconds after the car starts and won't go off. The temperature gauge stopped working and the Check Engine light came on. Coolant is also leaking from the engine. I changed the coolant sensor, but nothing changed.

Coolant is leaking Inspection $94.99 - $114.99 Get a Quote

The two engine fans are controlled by separate relays that are turned on by a powertrain control unit. The system is controlled through the body control module that signals the powertrain control unit. The body control module gets signals from the cooling system and the air conditioning to turn the fan on and off. The complete system would need to be checked but I would recommend you get the coolant leak checked first by a certified technician. They would need to scan for codes, pressure test the cooling system and check the cooling system sensor or wiring problems.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Car not going over 20 MPH
Hello. If the car will not go over 20 MPH then there can be a number of issues going on. If the Check Engine Light is on then the computer needs to be scanned for codes first. If there are...
Steering wheel feels loose
From the description provided, it appears your Isuzu may have damaged one or more of the components in its steering and suspension system. The vehicle may still be drivable, but I must emphasize that this does not mean it is...
Power window stuck in the down position
This is typically what occurs when the window motor or regulator fails. Most of the time, it is the motor. The motor could have already been getting weak, and when this occurs the motor can lower the window because it...
Clutch issues
I have seen some flywheels that after the resurface is done and the clutch and pressure plate is installed the bolts will bottom out and not fully seat the pressure plate. This will cause the clutch to not disengage all...
ASE certification
Hello and thank you for contacting YourMechanic. Yes, experience will greatly help out a lot when it comes to taking Automotive Service Excellent tests (ASE) (https://www.yourmechanic.com/article/how-to-become-ase-certified). When it comes to taking ASE tests, you need to think about the procedures...
Car has been reving in park/idle at around 1000-3000 rpms
Code P0123 relates to the throttle position sensor (https://www.yourmechanic.com/services/throttle-position-sensor-replacement). The throttle position sensor (TPS) is a sensor used to monitor the throttle position of the throttle plate inside the throttle body in relation to your foot position on the gas...
Wont drive forward or reverse 2007 Ford Focus
Hello - there could be a problem with either or both your shifter cables to the transmission, as well as the clutch (https://www.yourmechanic.com/question/how-does-a-clutch-work-by-richard-manning) linkage (check fluid first for this). One or more of your brakes is sticking as well, causing...
My car loses power then won't go over 20 mph its a 05 pontonic grand prix
Hi April. The Reduced Power light usually indicates a fairly serious problem with the throttle system. When this light illuminates the vehicle will often go into a “safe mode”, which will severely limit the speed of the car and in...

Related articles

P0215 OBD-II Trouble Code: Engine Shutoff Solenoid Malfunction
P0215 P0215 Code Definition Engine shutoff solenoid malfunction What the P0215 code means The P0215 code means that the solenoid responsible for shutting off the engine or the crankshaft position sensor has an issue. What are the causes of the...
P0575 OBD-II Trouble Code: Cruise Control Input Circuit
P0575 code means that the control input circuit is suffering from an electrical malfunction often due too a faulty, cruise control switch or wires.
P0311 OBD-II Trouble Code: Cylinder 11 Misfire Detected
P0311 means that the powertrain control module (PCM) detects a misfire in cylinder 11, often due to a faulty spark plug or clogged fuel injector.