I have replaced the thermostat and 2 maxi fuses for the fans in my 2004 Chevy Ventura. Will a weak relay cause the fans to spin slowly?

SOURCE: Radiator fan not working

Hi,

I am assuming that you are referring to the radiator fan. You need to verify that the fan motor is receiving 12V when it is supposed to be kicking in (engine hot) with a DVM (voltmeter) in its actual location. Having done this and likewise verifying that the ground is properly attached/connected, then your problem would be with the "clutch". Radiator fan clutch differs from aircon compressor clutch which is electrical and the transmission clutch which is mechanical. Most radiator auxiliary fans (not directly coupled) uses "silica oil". This oil has an inverse property, that is when hot it gets thicker and thus the rotation of the motor is transferred to the blades. There would be a filling hole adequately plug in or near the front of the fan assembly.

If your concern is not corrected by the addition of silica oil or if you can not measure 12V on the fan connector itself when it is supposed to kick in, then chances are your problem is electrically related. Some fan motor switching systems are coupled to the aircon switching.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

SOURCE: 2004 pontiac aztek cooling fans not working

relays control fans high and low. does fan come on with a/c on?hot wiring only will create more expensive problems in future!!!!! 2004 not 84

SOURCE: Radiator fan not working

Hi. Check the bottom of the radiator or on the side, as you also have a temperature-sending switch. The switch must reach a certain temperature before sending a signal on to the fan relay.

The switch just screws into the radiator.

If you would like to contact me again about this or other problems, feel free to do so.
Bill
ASE Master Technician

anwar alkhaldi

• 197 Answers
• Posted on Mar 14, 2009

SOURCE: 2000 cavalier 2.2L cooling fan will not come on

after you check the grond in the fan conector and all the fuses i can say its coolent temp sensor.

SOURCE: cooling fans not working 1999 chevy ventura

I would check the relays by switching them with the same type of relay . For example. The relay for the radio could be the same kind for the cooling fan. Proccess of elimintation.
Then if the switching of the relays does not solve it then I would have the cooling fan replaced.
You may want to take to you local mechainc for the repairs.