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Mercedes Benz E320 Electric Cooling Fan

Knowing What is Wrong with Mercedes Benz E320 Electric Cooling Fan

A Mercedes Benz E320 electric cooling fan keeps the temperature of the engine coolant and antifreeze from rising above the operational temperature. It pushes or pulls air through the radiator core. It is usually off when the engine temperature is within the predetermined level and comes on when there is an increased load on the cooling system such as running the air conditioner. A bad electric cooling fan, however, can make the engine overheat if it does not turn on at the right time. Here are some tips you can follow to identify what is wrong with your car's electric cooling fan:

Check the fan circuit.

To check the fan circuit, start the engine and turn the A/C to maximum. Observe if the fan runs. If it does, the fan motor, relay, fuse, and wires are fine. Another way to check is by using a voltmeter or a test light on the fan's wiring connector. When the engine is hot and the A/C is turned on, you should be able to observe voltage. Otherwise, the fan has gone bad. Still another way to check is to jump the cooling fan directly to the battery. In this case, if the fan runs, the motor is good, but the problem may lie on the wires, the fuse, or the control circuit. If it does not, check the wires, fuse, and control circuit. And if you find them working properly, then your fan motor needs to be replaced.

Check the temperature at which the fan comes on.

To perform this check, turn off the A/C and let the engine reach its normal operating temperature. The fan would normally go on at 200 to 230 degrees. If it doesn't, a resistance check should be made on the temperature sensor or the switch. Also, check the voltage on both sides of the relay.

Check for noisy bearings.

When the fan does turn on after your Mercedes' engine reaches its operating temperature, but its bearings make a lot of noise, it indicates that the motor is worn. Aside from this, you will also be able to observe that the fan turns quite slower than it used to.

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  • Tips to Keep Your Mercedes Benz E320 Electric Cooling Fan in Top Condition 04 March 2014

    Keeping your engine in its normal operating temperature is the job of the Mercedes Benz E320 electric cooling fan. Over time, though, dirt from the road or simply age and use can put adverse effects on the electric cooling fan, eventually causing it to fail. So, to prevent an even earlier retirement, it is necessary to follow some simple maintenance tips to prolong the useful life of the cooling fan.

    • Install the fan properly.
    • Install properly-this is probably the best preventive maintenance measure for any car part. Most problems associated with radiators and overheating is rooted in a faulty or improper installation. So when installing a new Mercedes Benz E320 electric cooling fan, make sure you do it right to prevent any problems.
    • Clean the electric cooling fan.
    • Sometimes, dirt or tar can build up by the blade and prevent the fan from spinning. This will eventually wear out the fan and probably the whole assembly, too. So to prevent further damage, remove the gunk and clean it off with a clean rag dipped in some degreaser. Wipe the blades clean and use a pipe cleaner for small areas you can't reach with the rag.
    • Make sure the connectors are clean.
    • Keeping the wires and connectors clean will eliminate any interruption in the power flow. This will help ensure that the fan will turn on when the engine needs it to, thus saving your car from overheating.
    • Lubricate the electric cooling fan bearings.
    • To allow for maximum cooling functionality, it is important to grease or lubricate the hub and the bearings. Aside from lessening friction, the lubricant also eliminates the noise and prevents rust on the bearings, effectively prolonging the life of the cooling fan as a whole. The most suitable lubricant for the fan bearings is a combination of ester oil and urea soap thickener.
    • Maintain a good level of radiator fluid.
    • The cooling fan is activated by a sensor in the radiator tank, which detects the temperature of the coolant. So if the coolant level is low, the sensor will not be able to detect the coolant temperature. Check the radiator tank and add some coolant up to its fill line as necessary.