This is about the radiator fan switch located right beside the thermostat ('99 4-cyl). I think mine's not working because the fans dont come on when the engine gets hot, which they used to before. I unplugged the connector on the switch and shorted the contacts, the fans came on so nothing else in the circuit is wrong.
I believe the temperature rating for the switch is 196-203°F.
Are there any aftermarket switches that close (switch on) at a lower temperature
like 170° or 160°F ?
Re: Radiator fan switch test and replace (Elvis1977)
I have no clue why it would go bad, out of all the things that could go bad by 77k miles. I tried checking resistance also, cold is open but engine hot still doesnt show some resistance.
After how long the engine has been running typically does the coolant temp reach 190-200°F ? I remember only once when I left it idle for a while (>5mins), the fans kicked in but went off in a matter of 3 or 4 seconds.
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