The radiator is mounted at the front of your vehicle behind the grille where it is exposed to airflow when your vehicle is at speed. Heat from the coolant in the radiator core tubes is transferred to the fins and to the air flowing through the radiator, thereby lowering the coolant temperature. However, when your vehicle is moving slowly or stopped, there is little or no ram air through the grille, so the necessary airflow is supplied by a cooling fan.

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There are mechanical and electric cooling fans. Most mechanical fans mount on the water pump shaft and are driven off of the crankshaft with the same belt and pulleys that turn the water pump. Because fan operation is generally not needed when the vehicle is at speed, the fan blade is attached to a clutch that disengages the fan to reduce noise and save fuel. Most fan clutches are thermal, and engage and disengage according to air temperature.

An electric cooling fan blade is driven by a 12V electric motor that operates in response to coolant temperature and the air conditioning switch. One or two electric fans are mounted in a shroud assembly that attaches to the radiator. Shrouds are used with both mechanical and electric fans to ensure all airflow is drawn through the radiator. When engine coolant reaches a pre-determined temperature, a switch signals the Powertrain Control Module (PCM), which activates the fan until the temperature drops below the switch rating. One or both fans may run when the A/C is turned on to provide airflow through the condenser.

Before condemning the fan for a cooling system related problem, check the shroud for cracks and missing pieces that could reduce airflow through the radiator. Check the fan blades for cracks and damage as well. Leaking fluid and a fan that is seized, spins roughly or spins excessively indicates a bad fan clutch. Electric cooling fans may not operate because of a malfunctioning switch, bad fan relay, defective fan motor, or faulty control module. A jumper wire can be used to check the motor, and voltage and resistance checks can be used for switch and relay, but a scan tool may be necessary to achieve a diagnosis.

If fan component replacement is necessary, we can accommodate the needs of any fan configuration. For mechanical fan vehicles we have fan blades, thermal and non-thermal fan clutches, and electronic fan clutches for severe duty applications. If you have an electric cooling fan we have fan blades, motors, switches, relays, and complete assemblies. All parts meet or exceed original equipment specifications, and are made using premium materials on state of the art manufacturing equipment. With our replacement fan parts you can expect precise fitment and perfect performance, at a price far lower than you’d pay at the dealer.

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Radiator Cooling Fans Reviews

Average rating:  4.5  4.6 - 52 reviews
Read All Radiator Fans, Clutches Reviews
4.8 of 5
Quick Service On The Correct Fan
This fan was purchased and installed on my 2003 VW Passat Wagon. This was the third vendor I had tried for this part. The first two vendors sent a fan whose electron motor was significantly larger than this one (the motors on those fans were much "deeper", or said another way, the motor extended back from the fan blade much further). This product arrived quickly and looked exactly like the one shown in the picture. The connector from the fan fits to the cable running to the fan control module. In addition, the fan fits nicely onto the rectangular fan assembly–the bolts were exactly where they should be. I have, now, used the fan for about two weeks and all is well. The fan comes on and runs as expected.
RPosted by Rodney (Beaver Falls, PA) /
2003 Volkswagen Jetta
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