Newbie needs some help
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Junior Member
Joined: Jun 2018
Posts: 4
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From: Central Kentucky
Car: 91 RS
Engine: 305
Transmission: Auto
Axle/Gears: Stock
Re: Newbie needs some help
Thank you! I'm have slight trouble with fan. I found this and was hoping the fan switch hadnt broken off in the block .
Joined: Dec 2004
Posts: 16,737
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Newbie needs some help
The fan switch in located in the block between cylinder 6&8 on a v8.
If the fan switch wire gets grounded the relay sends power to the fan.
If the fan switch wire gets grounded the relay sends power to the fan.
Joined: Dec 2004
Posts: 16,737
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Newbie needs some help
Here is a schematic for tpi, the wiring on the lower fan is the same for tbi. The ac pressure switch on cylinder head switch being grounded will command on the fan.
The relay is on the bulk head next to the master cylinder.
The relay is on the bulk head next to the master cylinder.
Thread Starter
Junior Member
Joined: Jun 2018
Posts: 4
Likes: 0
From: Central Kentucky
Car: 91 RS
Engine: 305
Transmission: Auto
Axle/Gears: Stock
Re: Newbie needs some help
Thank you. That is a huge help. I'm new to tbi. I usually tinker with VWs. Water and air cooled.
Joined: Dec 2004
Posts: 16,737
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Newbie needs some help
A lot of times the connector becomes brittle and breaks. If you need a new one here’s a link to one.
https://m.ebay.com/itm/GM-Knock-Sens...UAAOSwNSxVNx-6
If the switch has failed a gn sw555 is a good replacement on at 210f off at 205f
Stock iirc is on at 226f.
https://m.autozone.com/cooling-heati...03831_0_0?aqs=
https://m.ebay.com/itm/GM-Knock-Sens...UAAOSwNSxVNx-6
If the switch has failed a gn sw555 is a good replacement on at 210f off at 205f
Stock iirc is on at 226f.
https://m.autozone.com/cooling-heati...03831_0_0?aqs=
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Oct 10, 2014 10:53 AM