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GS - 2nd Gen (1998-2005) Discussion about the second generation GS300, GS400 and GS430 (1998 - 2005)

Radiator fans

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Old Jan 6, 2017 | 07:45 AM
  #1  
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Default Radiator fans

Hey I tried to look up information about this topic, but I could not find the answer to my question. I recently changed my radiator and now both fans turn on periodically or they both stay on when the AC is turned on, before it use to be 1 fan would stay on all the time and the other fan would turn on periodically. Now I need to know which one is the correct sequence, because I do not want the car to overheat or whatever.
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Old Jan 8, 2017 | 10:55 AM
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The fans should run when the A/C is on. Other than that they should cycle on and off as needed. One or both should not be on 100% of the time.
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Old Jan 10, 2017 | 07:25 PM
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Originally Posted by eicca
The fans should run when the A/C is on. Other than that they should cycle on and off as needed. One or both should not be on 100% of the time.
My fans are on 100% of the time, even with the key in the "on" position. What should I check first?
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Old Jan 10, 2017 | 08:28 PM
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Thermal switch on the lower driver's side of the radiator. A/C pressure switch. Fan control relays. Engine coolant temperature sensor (different from the one that controls the gauge). I don't have schematics for these so you'll have to search.
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