How do you test a thermal clutch fan?
To confirm the diagnosis, start with this simple test: Spin the fan as hard as you can on an engine that has not been started that day. If the fan rotates more than five times, you can bet the clutch is bad. You should feel some resistance and the fan may spin up to three times, depending on the ambient temperature.
Is it normal for cooling fans to run all the time?
Even with the cooling fans running all of the time, the engine thermostat should force the engine to warm up at a normal speed. The thermostat will regulate the coolant to the radiator/fans if it is working properly. It can be normal for the cooling fans to run constantly under certain conditions.
What to do if your cooling fan won’t turn on?
Pull the cooling fan relay out of the box. Replace the cooling fan relay with a new one. A stuck closed relay is the only thing that can operate the cooling fan continuously with the key off. The computer looses power with the key off and the same applies to the coolant temperature sensor.
Why does my Engr fan stop working in the winter?
First try this again but make sure anything to do with the climate control or air condition is switched off. When the a/c is switched on the fans do run constantly, even in the winter months. There will be a short delay before the fans stop running when the a/c is switched off.
Why does my Pontiac cooling fan keep running?
If they are, the ECU is commanding them on falsely (bad temp sensor or it thinks the missing A/C compressor is “on”) or the relay may be stuck closed. Usually you can find another relay of the same type in your fuse box and switch them to see what happens.
What are the symptoms of a bad cooling fan relay?
1. Engine running hot 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.
Is it normal for a car cooling fan to run constantly?
Both cooling fans run constantly. The AC is off. Engine cold, start up, and they both run continuously. Key off, and they both stop. Not sure about the different speeds, but I venture to say it is high speed. I suspect this is not normal. However, the AC does work good!
What to do if your Mercedes cooling fan keeps running?
To avoid this, cancel and sign in to YouTube on your computer. Automotive information based around Mercedes-Benz information and repair assistance along with other makes and models. No matter what car you own or need help with, my tips and tricks and teachings can help you along the way.
What to do if your computer cooling fan won’t run?
Replace the cooling fan relay with a new one. A stuck closed relay is the only thing that can operate the cooling fan continuously with the key off. The computer looses power with the key off and the same applies to the coolant temperature sensor. The relay, however, has direct power to one side, the same as a light switch.