The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Depinned engine harness --- now ... ??

e015475 · 03-15-2019, 10:23 AM

Here's a thread from LS1tech.com that has a couple schematics in it for a two speed fan controller. Post 15 looks like an extract out of the factory manual-

https://ls1tech.com/forums/conversio...e-i-m-5-a.html

If you're running just one fan on your radiator/condenser, you might want to look into a PWM (pulse width modulated) controller to continuously vary fan speed as a function of water temp. Quite a few modern cars come with this technology to minimize cooling fan noise.

Having said all this, I have a daily driver that's been switching the fan on and off high speed for the last 100K miles - no problems. It is a little noisey, but so what. I just need to use the 50A relays or it will eventually melt them.

03-15-2019, 10:23 AM	#14
e015475 Registered User Join Date: Nov 2013 Location: Show Low, Arizona Posts: 761	Re: Depinned engine harness --- now ... ?? Here's a thread from LS1tech.com that has a couple schematics in it for a two speed fan controller. Post 15 looks like an extract out of the factory manual- https://ls1tech.com/forums/conversio...e-i-m-5-a.html If you're running just one fan on your radiator/condenser, you might want to look into a PWM (pulse width modulated) controller to continuously vary fan speed as a function of water temp. Quite a few modern cars come with this technology to minimize cooling fan noise. Having said all this, I have a daily driver that's been switching the fan on and off high speed for the last 100K miles - no problems. It is a little noisey, but so what. I just need to use the 50A relays or it will eventually melt them.