How does thermostat control fan speed?
The only time the thermostat controls the fan is when the fan is set to on instead of auto, and the heating system is off. There should be no issues with gas being selected for an electric furnace.
What should the radiator fan be running at?
The fan continues to run at its maxiumum speed, regardless of the engine temperature. I allowed the car to run today from cold to just above 80 deg. C before sutting it off today.
Why does my blower fan only work on one speed?
by Lee Sallings. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. This can be annoying, but troubleshooting is easy. If you start at the blower motor, and check resistance in the circuit, you will find the problem in no time.
Why is my Mercedes radiator fan running on high speed?
Please try again later. This is a very common problem with the Mercedes radiator cooling fan running constantly on high speed. The problem in most cases is a bad ecm so in order to fix it the ecm will have to be replaced and programmed to work with your vehicle. Check the mass airflow sensor first.
How does the blower motor speed controller work?
If what you mean by “Control Module” is the the electronic controls in the dash, that control module sends a signal to the blower motor speed controller. https://www.rockauto.com/catalog/moreinfo.php?pk=2417088&cc=1431202&jnid=509&jpid=6 If the speed controller fails, the blower fan will run all the time. Bing July 6, 2016, 6:27am #5
Why is my engine cooling fan running at constant high speed?
There is no Schraeder valve on the sensor and removing the sensor allows the gas to escape into the atmosphere. Replace the sensor and confirm good location of the wiring connector. Locate wiring in order to avoid chafing of harnesses. Use the AssistPlus to check the reading in the climate control module.
What to do if your climate controlled blower wont shut off?
If your climate controlled blower processor is shot, be prepared to spend mucho bucks for a replacement. But before you start throwing expensive parts at the problem, you’ll have to do some checking. Start by testing the gray/black wire at the blower motor control processor. First, try grounding the wire. Then try removing it.
If what you mean by “Control Module” is the the electronic controls in the dash, that control module sends a signal to the blower motor speed controller. https://www.rockauto.com/catalog/moreinfo.php?pk=2417088&cc=1431202&jnid=509&jpid=6 If the speed controller fails, the blower fan will run all the time. Bing July 6, 2016, 6:27am #5
What happens if the blower controller has failed?
If the blower controller has failed as mentioned it’s also possible that it failed because the blower motor is failing. When the blowers get some age on them the current draw increases dramatically and that means a lot of additional heat. In some cases the blower controller connector will burn or even melt to some degree.