Fans not running
Thread Starter
Teching In
Joined: Aug 2021
Posts: 7
Likes: 2
Fans not running I just swapped a LQ4 6.0 truck motor into my 2002 Camaro SS. After driving it for about 15 mins it started to overheat. After letting it cool down I fired it up and the fans were not visibly running nor could I hear them. Coolant seems to be moving throughout the motor just fine. How do I get the fans to turn on?
TECH Fanatic
Joined: Dec 2017
Posts: 1,467
Likes: 265
From: Bossier City, Louisiana
Its going to take some operating system tune adjustments and a set of relays to control the fans if you want the PCM to do it. Plenty of thread discussions around here about that.
Or, I run two Four Seasons part number 35879 fan relay / fuse / adjustable thermostat kits. One kit for each of my fans with their own power supply, ground, relay and fuse for best cooling safety and redundancy. These kits also have support for a fan when needed as the AC compressor turns on. They also kick on a seven inch fan for my transmission cooler. I have a third one of these kits that kicks on a seven inch pusher fan in front of my AC condenser that yields me another six degrees F of colder air at the center vent - now a measured 34 degree F air going down the road using a meat thermometer stuck into the AC vent. Can you tell that I'm a believer in these fan relay kits? The only problem I've had with them was trying to make one relay kit support two big radiator fans that each eat a lot of amps - the fuse holder got a little hot until I split my fan operation into two relay assemblies.
https://www.summitracing.com/parts/f...xoCZmUQAvD_BwE
Rick
Or, I run two Four Seasons part number 35879 fan relay / fuse / adjustable thermostat kits. One kit for each of my fans with their own power supply, ground, relay and fuse for best cooling safety and redundancy. These kits also have support for a fan when needed as the AC compressor turns on. They also kick on a seven inch fan for my transmission cooler. I have a third one of these kits that kicks on a seven inch pusher fan in front of my AC condenser that yields me another six degrees F of colder air at the center vent - now a measured 34 degree F air going down the road using a meat thermometer stuck into the AC vent. Can you tell that I'm a believer in these fan relay kits? The only problem I've had with them was trying to make one relay kit support two big radiator fans that each eat a lot of amps - the fuse holder got a little hot until I split my fan operation into two relay assemblies.
https://www.summitracing.com/parts/f...xoCZmUQAvD_BwE
Rick
Thread Starter
Teching In
Joined: Aug 2021
Posts: 7
Likes: 2
Thanks for that advice, Rick. For an immediate fix I went ahead and wired the fans up to a key on fuse, so my fans are always running. I’ll look into those relay kits when I’m ready to return it to stock form.
