91rs 3.1 fan switch
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Junior Member
Joined: Feb 2006
Posts: 77
Likes: 0
From: kentucky
Car: 91 rs
Engine: 3.1 v6
Transmission: 700r4
91rs 3.1 fan switch
does the 1991 3.1 rs have a fan switch on the passenger side head that grounds to turn on fan, or is the fan controlled by ecm.
my chiltons/haynes diagram shows the dark green/w wire going to ecm and no fan switch at all.
my chiltons/haynes diagram shows the dark green/w wire going to ecm and no fan switch at all.
Senior Member
Joined: Oct 2004
Posts: 575
Likes: 1
From: Smithfield, NC
Car: 1987 Camaro SC
Engine: 2.8L MPFI (rebuilt)
Transmission: 700R4 swapped to T5
Axle/Gears: 3.42 open
My '91 Firebird's fan is controlled by the ECM. No switch in the Pass. side head. I assume the Camaro is the same.
When I first got the car the fan would run all the time when the key was on. Someone had grounded the Grn/Wht wire, I spliced in a switch in the ground wire so I could turn it off, and reconnected the relay to the ECM. Seems to work fine controlled by the ECM though, so I don't know why they had grounded it.
When I first got the car the fan would run all the time when the key was on. Someone had grounded the Grn/Wht wire, I spliced in a switch in the ground wire so I could turn it off, and reconnected the relay to the ECM. Seems to work fine controlled by the ECM though, so I don't know why they had grounded it.
Last edited by bru333; Mar 28, 2006 at 04:08 PM.
Senior Member
Joined: Oct 2004
Posts: 575
Likes: 1
From: Smithfield, NC
Car: 1987 Camaro SC
Engine: 2.8L MPFI (rebuilt)
Transmission: 700R4 swapped to T5
Axle/Gears: 3.42 open
Originally Posted by ron91rs
Thanks, thats what i thought...
So they had cut the dark green/white stripe wire at the relay , and and ran it instead to ground?
So they had cut the dark green/white stripe wire at the relay , and and ran it instead to ground?
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