Coolant Temperature Switch Installation
Thread Starter
Drifting
Joined: May 2002
Posts: 1,562
Likes: 1
From: "Drive like Hell, you'll get there faster." Tucson AZ
Coolant Temperature Switch Installation
I was just wondering where the heck is the Coolant Temperature Switch/Sensor that kicks the fans on at like 180 and off at 220? Is it under the throttle body? I thought I saw it the other day, cuz I wanna replace it, but I think I gotta unbolt the whole throttl body first.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Coolant Temperature Switch Installation (MaSTeRofDZaSTeR)
I believe your '90 has two fans behind the rediator; in which case you don't have such a switch. The ECM has sole control over the fans and the on/off points are programmed into the EPROM.
You can install an aux fan switch after removing the plug in the block below #1 & #3 spark plugs. Then wire that new switch per my C4 Tech Tip to turn on both fan relays or only one, as you chose.
You can install an aux fan switch after removing the plug in the block below #1 & #3 spark plugs. Then wire that new switch per my C4 Tech Tip to turn on both fan relays or only one, as you chose.
Thread Starter
Drifting
Joined: May 2002
Posts: 1,562
Likes: 1
From: "Drive like Hell, you'll get there faster." Tucson AZ
Re: Coolant Temperature Switch Installation (65Z01)
I believe your '90 has two fans behind the rediator; in which case you don't have such a switch. The ECM has sole control over the fans and the on/off points are programmed into the EPROM.
You can install an aux fan switch after removing the plug in the block below #1 & #3 spark plugs. Then wire that new switch per my C4 Tech Tip to turn on both fan relays or only one, as you chose.
You can install an aux fan switch after removing the plug in the block below #1 & #3 spark plugs. Then wire that new switch per my C4 Tech Tip to turn on both fan relays or only one, as you chose.
