Is there a way to manually turn on the cooling fan?
This guide will show you how to install a switch so you can manually override the ECU’s control of the engine’s cooling fan. This can be useful in several cases. Firstly, the ECU will not turn on the fan itself until the engine is quite a bit over the normal operating temperature.
Why is my Mercedes Benz cooling fan not turning on?
But you can check how much the voltage changes during igniton off/on, engine running/AC on to maximum cooling. If you see the change- this means ECU is giving out comands and wiring is ok. So that leaves Fan module as the weak link. Mercedes uses their own transmissions, which are repairable.
Is it OK to turn AC off on Mercedes Benz?
On some older Benzes, it is ok for temperature to rise with AC off, to reasonable extent (102C) of course. At this point, fan actuation must be checked with Star Diagnosis. I think the Fan module does not actuate the fan at lower end of output request. When temperature is below 100C- fan output request could be under 10% of full power.
Can a manual switch be added to a radiator fan?
Adding a manual switch to an electric radiator fan is an economical way of keeping your car cool and in good condition. If you’re rusty or new to this automotive element, here’s a short rundown of how radiator fans work.
But you can check how much the voltage changes during igniton off/on, engine running/AC on to maximum cooling. If you see the change- this means ECU is giving out comands and wiring is ok. So that leaves Fan module as the weak link. Mercedes uses their own transmissions, which are repairable.
On some older Benzes, it is ok for temperature to rise with AC off, to reasonable extent (102C) of course. At this point, fan actuation must be checked with Star Diagnosis. I think the Fan module does not actuate the fan at lower end of output request. When temperature is below 100C- fan output request could be under 10% of full power.
What’s the VIN on a Mercedes Benz radiator?
Hi Stan, The fan has 2 wires on it, vin: WDBNG75J8YA084049 . . I guess what I really need to know is the sensor, relay, fuses, etc.. that controll the fan so I can check / measure their function…
Adding a manual switch to an electric radiator fan is an economical way of keeping your car cool and in good condition. If you’re rusty or new to this automotive element, here’s a short rundown of how radiator fans work.