Cooling fan runs constantly – 2003 Saturn L200

ANSWER : Hi there – I think you are on the right track looking at the cooling fan control module as the failure point. I would not expect that you fixed anything by jiggling it. Most likely, a relay is stuck shut (burned contacts), which is causing the fan to continue to run after shutting off the engine. Jiggling it may have created enough vibration to "unstick" the contacts. I would recommend an electrical component inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

ANSWER : Hi there. It is best to always put on the OEM parts that are required for the vehicle. However, you can get a flex-a-light clutch fan for your vehicle as long as it will bolt up to your water pump pulley and clear the radiator and shroud. I recommend having a clutch design fan for your vehicle and not a fan that spins with the engine all the time. Those fans will cause the engine to overheat on highways and in town especially in hot weather. If you need further assistance with your cooling fan, then seek out a professional, such as one from Your Mechanic, to help you.

ANSWER : Hello,
You should check with the person you bought the fan from. I show a listing of a single or a dual fan system. You should replace the fan with the same as what was removed. You should not use the single fan when you were equipped with a dual fan system. The wiring and programming is different depending on how it was made.

ANSWER : Hi there. Your issue is the ECT sensor B is not closing the loop when engaged. There is power to the sensor A from the computer, but the sensor B is not connecting when the vehicle is running hot or when the air conditioning is on. I recommend replacing the ECT sensor B, which is the on and off switch for the cooling fans. On the relay, terminals 2 and 4 are the direct circuit for the cooling fan, terminal 1 is the ground, and terminal 3 is for the circuit to the air conditioning system. Check the wiring between the fuse box and the terminal 3 for resistance and see if there is 0.5 ohms or less. If the meter reads OL, then there is a break in the wires and it would need fixed or replaced. If there is 0.5 ohms of resistance or less, then check the A/C switch and the ignition switch as they could be the source of disconnection. If you need further assistance with your cooling fans not working, then seek out a professional, such as one from Your Mechanic, to help you.

ANSWER : Hi there – yes, some Honda models (Accord) have a cooling fan control module, and some models have a timer for the cooling fan. This feature would allow the cooling fan to continue to run for a brief period after the engine is shut off to bring engine temperature down. Since you don’t mention which model Honda you have, it’s hard to speculate which components you have, and where they are located. I would suggest a cooling system inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

ANSWER : The cooling fan motors should both come on together. The cooling fan controller will control the speeds of the fans with input from the engine control module. Your fans are controlled by the fan controller on the fan motors and both motors and controller need replaced to fix the problem. If you want to have this checked, a certified technician from YourMechanic can come to your location to inspect the AC system and help you move forward with repairs.

ANSWER : Hi there. In general, a situation like this occurs when either the thermostat housing or temperature sensor is not relaying the information to the fan motor to activate. However, it’s also possible that there is some electrical short within the cooling system relay’s that is causing the fan motor to not activate when it should. I think the best way to determine the precise source of this problem is to have a professional mechanic come to your location to complete an onsite inspection so they can test all systems to help isolate the root problem and recommend the right repairs.

ANSWER : What you are describing sounds like a failure of the blower motor that circulates air in the HVAC system, however, there are certain faults that could occur in the electric circuit that powers the blower motor. If power is reaching the blower motor when the blower switch is in the on position and the blower motor is not functioning as intended then the blower motor is condemned and replaced. On the other hand, if there is no power, then the blower switch and the plug connection on the back of the switch, as well as the rest of the circuit should be inspected. If the circuit includes a blower motor resistor block, of course the resistor block has to be checked for continuity (i.e., specified resistance in ohms) at each position. If equipped with a relay in the circuit, that is easy to test and if the relay works consistently as commanded, you can assume there is no fault there. If you want these diagnostic steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a non functioning blower motor diagnostic/replacement and the responding mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic.