Temp Sensor Upgrades for 107 chassis

[aublutiger]

I've seen e-bay listings for temp sensors that actuate the aux fan at a lower temp. Has anyone purchased one of these?...do they work?...advisable?

Item 110186994155

Thanks, Matt

[KCM]

Don't know anything about that particular vender, but looks like it couldn't hurt to use it as long as it controls only the fan. Probably a sensor for another model or make of car made by the same company, with a lower trip temperature than the factory sensor. It is simply a thermostatically controlled switch that grounds out at a certain water temperature. I bet if you could find out a part number you could buy it cheaper elsewhere knowing how Ebay works.

[RickM]

Originally Posted by KCM

Don't know anything about that particular vender, but looks like it couldn't hurt to use it as long as it controls only the fan. Probably a sensor for another model or make of car made by the same company, with a lower trip temperature than the factory sensor. It is simply a thermostatically controlled switch that grounds out at a certain water temperature. I bet if you could find out a part number you could buy it cheaper elsewhere knowing how Ebay works.

Yup, that's how it works. On an old water cooled Porsche I had I used one of these to keep temps down. Worked like a charm. IIRC, all I had to do was drain the radiator and replace the sensor.

Does anyone know what the ideal operating temp is? It seems 90 degrees is awfully low to kick the fan on.

[KCM]

Originally Posted by RickM

Worked like a charm. IIRC, all I had to do was drain the radiator and replace the senser.

If you're quick enough (and they're fairly accessible), they can be replaced without draining the coolant.

Originally Posted by RickM

Does anyone know what the ideal operating temp is? It seems 90 degrees is awfully low to kick the fan on.

Remember it's Celsius, so 90 comes out to 194 Fahrenheit (100 would be 212).

[BDBENZ]

The factory standard one with the green two pole top is set to turn on your aux fan at 105C water temp which can be high. If you want your fan to come on sooner you want to get the aux fan on at 100C then you need a RED switch part # 006-545-42-24 to replace that old green one. You can purchase it from our host parts supplier on this forum. Just do a parts search, it should be in stock. I replaced mine and I fell that it works out much better, because your fan clutch on the main fan kicks it on at 105 as well.

bdbenz