Removed ECM. Will elec fan still work??
Senior Member


Joined: Mar 2001
Posts: 629
Likes: 10
From: New Yuck
Car: Non F-body :(
Engine: Pontiac 301
Transmission: TH350
Nope; won't work any more. ECM controls the fan. If you have dual fans, the secondary fan will still come on at the very high temp, but that's it. You'll want a relay and a cooler fan switch.
Supreme Member
Joined: Mar 2002
Posts: 4,812
Likes: 0
From: 62656
Car: 1991 S10 pickup 2700lbs
Engine: 4.3L Z TBI
Transmission: 700R4
Axle/Gears: 3.08 7.625"
another thing im worried about are gauges, you could just run a ign wire from fuse panel to the relay for the fan on the firewall so it will come on with ign, thats what I would do anyways, put inline fuse of 20 or 25 amps on it too
good luck
good luck
Supreme Member
Joined: Jul 1999
Posts: 1,335
Likes: 2
From: Tucson, AZ, USA
Car: '92 Z28; Dk Teal; Her Pkg
Engine: 305
Transmission: Richmond 6 Spd
Axle/Gears: Moser 9", Detroit Locker, 3.70
If your '86 Z was carbed (LG4 vin H, or L69 vin G), then the fan is not controlled by the computer - it was controlled by the A/C selector switch and a temperature switch in the RH cyl head, but if it was a TPI LB9, then the ECM controlled the fan & you will need to install a variable or fixed temperature fan control switch (available from Pep Boys, or other local auto parts stores).
Supreme Member
Joined: Jul 1999
Posts: 1,335
Likes: 2
From: Tucson, AZ, USA
Car: '92 Z28; Dk Teal; Her Pkg
Engine: 305
Transmission: Richmond 6 Spd
Axle/Gears: Moser 9", Detroit Locker, 3.70
If you kept fan temperature switch in the RH cyl head, and the fan relay, then it will function as it did previously. As I indicated above, turning on the A/C switch will also turn the fan on.
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