Manual Fan switch--how?
Thread Starter
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
Manual Fan switch--how?
I want to put in a manual fan switch in My 93 Lt1.
Reason: I want to leave engine off, hood up, fans on to cool car down quickly between drag strip runs so that I can get in lots of passes, each with 150-160 oil temp. (If you think this is a bad idea for engine life--let me know why).
How do I install? What do I need? I searched and it seems there is no kit that everyone uses, just parts from a hardware store.
I don't know anything about auto. electrical sys. but am willing to learn.
Also--ease of installation is a big plus. The switch does not have to be accessable from the cockpit but could be permanently in the engine compartment.
Reason: I want to leave engine off, hood up, fans on to cool car down quickly between drag strip runs so that I can get in lots of passes, each with 150-160 oil temp. (If you think this is a bad idea for engine life--let me know why).
How do I install? What do I need? I searched and it seems there is no kit that everyone uses, just parts from a hardware store.
I don't know anything about auto. electrical sys. but am willing to learn.
Also--ease of installation is a big plus. The switch does not have to be accessable from the cockpit but could be permanently in the engine compartment.
Le Mans Master
Joined: Jan 2000
Posts: 6,595
Likes: 1
From: Thornton CO
Not sure if the forum search engine has all of the archives yet but you should be able to do a search and find this info. I just bought a toggle switch and some 12 or 14 gauge wire. There is a wire on 1 of the fan relays that you need to tap into to wire to the switch. I'll go take a look at my car at lunch and report back. The hardest part was running the wire through the firewall.
Racer
Joined: Dec 2003
Posts: 345
Likes: 0
From: Rochester NH
Very simple instructions here.
https://www.corvetteforum.com/techti...=232&TopicID=2
I just did this. Took 15 minutes.
I wired both into one switch, but other than that the instructions are right on.
Fans run manually (by the switch) when the ignition is on. Otherwise the fans run normal.
https://www.corvetteforum.com/techti...=232&TopicID=2
I just did this. Took 15 minutes.
I wired both into one switch, but other than that the instructions are right on.
Fans run manually (by the switch) when the ignition is on. Otherwise the fans run normal.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Your fans are controlled through relays, which use a low current control voltage to switch on/off a high current drive to the fan motors. Fan drive power is supplied to the relay through a fusable link from the battery. Control power to the relay comes through fuse block; the ECM turns on the fan pulling the other relay control terminal to ground.
Soo, you just need to wire a switch into that relay terminal with a wire running from the switch to ground. Then, when you turn the switch On the relay will provide power to the fan.
Sorry, but I don't have relay wire color codes for a '93 as they differ from my '88.
Soo, you just need to wire a switch into that relay terminal with a wire running from the switch to ground. Then, when you turn the switch On the relay will provide power to the fan.
Sorry, but I don't have relay wire color codes for a '93 as they differ from my '88.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by 65Z01
Your fans are controlled through relays, which use a low current control voltage to switch on/off a high current drive to the fan motors. Fan drive power is supplied to the relay through a fusable link from the battery. Control power to the relay comes through fuse block; the ECM turns on the fan pulling the other relay control terminal to ground.
Soo, you just need to wire a switch into that relay terminal with a wire running from the switch to ground. Then, when you turn the switch On the relay will provide power to the fan.
Sorry, but I don't have relay wire color codes for a '93 as they differ from my '88.
Soo, you just need to wire a switch into that relay terminal with a wire running from the switch to ground. Then, when you turn the switch On the relay will provide power to the fan.
Sorry, but I don't have relay wire color codes for a '93 as they differ from my '88.
For the secondary fan relay control wire: dk blu/wht
If you apply a ground to these wires the relay closes and the fans will turn on.
