As the title suggests - my temp fan switch sometimes does not work, it acts up randomly in no particular event/order. Fans does come on when it's unplugged and as a temporary solution I've made a bypass
switch so I can turn on my fans whenever my temp starts to go up. Right now, I'm on the process of replacing my tstat and gonna flush the coolant and was wondering if I should order a new temp fan switch.

Btw, I have a 3sge motor and fan switch is located on the radiator. Thanks!

If they don't come on when you unplug the switch I would take a look at the fan relay first

My fans were running all of the time between 2013-2014. I replaced the switch located on the bottom of the radiator, and all three fan relays. They still ran all the time. I kept on unplugged through the winter, but it was still tough to get the engine temp up. They suddenly starting working properly around August 2014. I didn't do anything, but they work fine now. Gremlins I guess......

sounds like a bad connection somewhere.

there is also a pressure switch on the AC line. the switches are normally closed. when conditions exist, they open which grounds the relays turning on the fans