Question about 1998 Mercedes-Benz C-Class
WHEN I CONNECT IT DIREST TO 12 VOLTS IT WORKS FAST,OTHER WISE IT DOES NOT COME ON THE TEMP GOES OVER HALF WAY ON THE DAIL. CHECKED THE FUSE ,OK. IS THERE A RELAY AND WHERE CAN I FIND IT
Run 12 volts to it from anywhere else until you can sort it... As long as it's not running when ignition is off, it won't hurt to have it constantly running while you sort the problem out. That is, you can use the machine until you have the time.
Posted on Apr 06, 2015
You may have a sensor screwed in to the radiator that needs to be changed
Posted on Apr 06, 2015
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Posted on Jan 02, 2017
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Apr 27, 2017 | Kia Cars & Trucks
Jun 07, 2016 | 2000 Ford Focus
Unplug the coolant temperature sensor while the engine is running. This should cause the fans to turn on low then kick to high, IIRC.
Typically when the engine computer loses the signal from the coolant temp sensor, it just turns both fans on high so the engine will not overheat. Ultimately, the fan is controlled by the computer. When it receives a signal from the temp sensor that reads the appropriate temp, it turns the fan on. One easy option is to wire a switch to the cooling fan relay. Then you can turn it on and off when you need it. I would not recommend running the fan constantly. You will burn out the fan motor and you'll never get up to normal temp for your sensors.
Check for coolant level and bad motor.
However as far as the fans and "disconnecting them from the temp sensor"..... The fans DO NOT connect directly to the temp sensor. They connect to the PCM (computer). The PCM reads the coolant temp sensor, and determines when to turn on the fans. It also uses the coolant temperature to control several other functions, including the transition from "open loop" A/F ratio control to "closed loop" A/F ratio control. It uses the temp to set the idle speed on cold start. It uses the temp to determine the cold start fuel enrichment. If you run this way, your car will be hard to start, it will run excessively rich, wasting fuel, and possibly even damaging the engine by diluting the oil.
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