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

Quote:

Originally Posted by marcg83

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...