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View Full Version : Cooling fan bypass

marcg83
03-18-2010, 09:01 AM
Ok, so I've seen this mentioned a couple of times on the site, but not sure if there was any real in depth description of it. I have seen people mention they bypassed the cooling fans to operate on a seperate switch mounted somewhere in the car so they can be turned on and off anytime. I looked to see if there were any posts dedicated to this, but could not find one. If anyone has done this, could you possible pass on some knowledge. I don't want to mess with the electrical without at least some sort of guide. I have a 2000 with the 2.4l. Thanks for the help.
Nate's Alero
03-18-2010, 10:56 AM
and why do you want to do this?
marcg83
03-18-2010, 11:43 AM
Why do any of us do anything Nate. The fans don't seem to be working properly and not pushing enough air. I figured if I bypassed them, I could put them on when stuck in lovely NY traffic so I don't overheat.
Nate's Alero
03-18-2010, 11:51 AM
Why do any of us do anything Nate. The fans don't seem to be working properly and not pushing enough air. I figured if I bypassed them, I could put them on when stuck in lovely NY traffic so I don't overheat.

hmm, the issue may not be the fans themselves, why not get a change of coolant/radiator flush and use some waterwetter with 50/50 Green Mix, i know my fasn sucked on Dexcool, and changed it out and now when they come on a little below the 3/4th line, the temp drops right down to below half
BlackJack
03-18-2010, 03:26 PM
might also be your CTS needs replaced as well. If you do a mod, make sure you set it up so it goes on/off when it's supposed to by the computer, but that you can only override making it come on, not forcing it off. I think there's a Casper's Fan Switch setup that will do this for you.
cavaliers60
03-18-2010, 03:39 PM
yeah if you override it and turn it on and off manually, what if you forget? you will overheat the car and tear the engine up.
worknprog.99
03-18-2010, 10:46 PM
^^ i would hope he would see the temp rise and go "oh snap better flip on the ol' fans"
guiguilandry
03-18-2010, 10:48 PM
you best bet if you have a little money on hand is get a new 180* t-stat, flush the old prestone and fill it with new one and get you fan turn-on point set to 180* in your pcm table by somebody that has a hptuner (if you know someone that has one)..... like cavaliers60 said... if you forget to turn them on... it'll cost way more to repair...