Which fan is the primary one
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Joined: Mar 2010
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From: Central CA
Car: 1992 Camaro
Engine: LB9
Transmission: WC T5
Axle/Gears: 10 Bolt - 3.42
Which fan is the primary one
Hey guys,
just got my 305 running again after a head gasket job. When a friend of mine was looking at it he noticed that the passenger side fan came on first. It never got hot enough for the second to turn on but he was say that the driver side fan should come on first to cool the hot water coming in.
Can someone verify?
thx
just got my 305 running again after a head gasket job. When a friend of mine was looking at it he noticed that the passenger side fan came on first. It never got hot enough for the second to turn on but he was say that the driver side fan should come on first to cool the hot water coming in.
Can someone verify?
thx
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From: Houston, TX
Car: 1989 GTA
Engine: SuperRam 350
Transmission: Pro Built S/S TH700R4
Axle/Gears: 3.27
Re: Which fan is the primary one
Driver side is the primary fan. Secondary is on the passenger side.
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Joined: Jan 2010
Posts: 63
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From: Northern Italy
Car: '88 camaro iroc-z
Engine: 350 TPI
Transmission: TH 700 R4
Axle/Gears: 2.77 Borg Warner Axel
Re: Which fan is the primary one
in my 88 iroc:
primary: driver side (ECM controlled)
secondary: pass side (temp switch controlled)
when the secondary fan starts it will kick the primary fan too if it's off (ecm failure / temp switch lower than stock / manual switch) so i think yoo have to check wires, relay and fan motor.
let us know!
primary: driver side (ECM controlled)
secondary: pass side (temp switch controlled)
when the secondary fan starts it will kick the primary fan too if it's off (ecm failure / temp switch lower than stock / manual switch) so i think yoo have to check wires, relay and fan motor.
let us know!
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Joined: May 2006
Posts: 290
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From: Springfield, MO
Re: Which fan is the primary one
Edit: Wrong info in this original post - Corrected in a later reply after doing some additional troubleshooting!
My '92 Z28 (5.0) kicks the driver side on, but I've never seen the passenger one move. Turning on the A/C or the car getting to 238 degrees will set the driver side spinning.
The passenger just sits there doing nothing, and I believe it should be kicking on at 220 via ECM. I need to track that down. I don't trust one electric fan ... I like backup!
Mike
My '92 Z28 (5.0) kicks the driver side on, but I've never seen the passenger one move. Turning on the A/C or the car getting to 238 degrees will set the driver side spinning.
The passenger just sits there doing nothing, and I believe it should be kicking on at 220 via ECM. I need to track that down. I don't trust one electric fan ... I like backup!
Mike
Last edited by Midwest Muscle; Sep 12, 2010 at 07:51 PM. Reason: Wrong info, found out after the post
Thread Starter
Member
iTrader: (4)
Joined: Mar 2010
Posts: 165
Likes: 0
From: Central CA
Car: 1992 Camaro
Engine: LB9
Transmission: WC T5
Axle/Gears: 10 Bolt - 3.42
Re: Which fan is the primary one
Thanks all, I agree with u mike, your setup should be just like mine. I'm pretty sure my primary fan comes on when the a/c is on which seems to be backwards. I'm slowly learning about all the rigged up secrets that the previous owner did to the car. When I bought it the secondary fan was wired straight to ignition so it was always on. Gonna see if other fan comes on with a/c and if so I'm clipping wires and switching em.
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Joined: May 2006
Posts: 290
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From: Springfield, MO
Re: Which fan is the primary one
Okay, found out mine isn't doing exactly what I thought. I said the passenger side never came on ... That's because it's not gotten hot enough to.
My driver side is functioning as primary. It comes on (alone) when I turn the A/C on. It also comes on via ECM at 220. Verified this is the ECM side via the ALDL A-B jumper.
My passenger side does come on if the wire to the temp switch (between 6 & 8, passenger side head) is jumped to ground. So both fans work fine, as designed.
I had a lower temp secondary fan switch (215 vs 238), but just couldn't get the old one out. So I ended up doing something that I like even better ...
I ran a toggle switch inside the car, whereby I can ground that wire any time I want to. I will do that before the ECM-driven side comes on at 220. I prefer cooler to hotter.
And if I leave the switch alone (or just forget), the system will still function as designed ... Driver at 220, passenger at 238. So now I have control, and factory design(s) still function.
Mike
My driver side is functioning as primary. It comes on (alone) when I turn the A/C on. It also comes on via ECM at 220. Verified this is the ECM side via the ALDL A-B jumper.
My passenger side does come on if the wire to the temp switch (between 6 & 8, passenger side head) is jumped to ground. So both fans work fine, as designed.
I had a lower temp secondary fan switch (215 vs 238), but just couldn't get the old one out. So I ended up doing something that I like even better ...
I ran a toggle switch inside the car, whereby I can ground that wire any time I want to. I will do that before the ECM-driven side comes on at 220. I prefer cooler to hotter.
And if I leave the switch alone (or just forget), the system will still function as designed ... Driver at 220, passenger at 238. So now I have control, and factory design(s) still function.
Mike
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