86 firebird 2.8 fan not working...where to start

Reply Subscribe

Thread Tools

Search this Thread

Feb 6, 2015 | 04:51 AM

#51

willexoIX

Banned

Joined: Nov 2008

Posts: 2,435

Likes: 1

From: Central Florida

Car: 89 Camaro RS running MS2X

Engine: .48/.60AR T3/T4 2.8L V6

Transmission: Rebuilt 700R4 2500 stall

Axle/Gears: Next to break...

Quote:

Originally Posted by camarotucker

http://austinthirdgen.org/mkportal/m...ine_wiring.gif

So what year was the change from ecm controlled fan to fan switch?

Feb 6, 2015 | 04:54 AM

#52

willexoIX

Banned

Joined: Nov 2008

Posts: 2,435

Likes: 1

From: Central Florida

Car: 89 Camaro RS running MS2X

Engine: .48/.60AR T3/T4 2.8L V6

Transmission: Rebuilt 700R4 2500 stall

Axle/Gears: Next to break...

Quote:

Originally Posted by greasyfox18

No luck yet...all looks good in the harness....im still not understanding why when i unplug the censor under the throttle body then start it up it runs but when i shut it off and plug in in they wont run when the engine
Is hot....

Replace that coolant sensor. Appears I was wrong and on the 86 that sensor does play a role in the fan coming off/on.

Feb 6, 2015 | 08:12 AM

#53

Ozz1967

Supreme Member

iTrader: (4)

Joined: Dec 2005

Posts: 4,795

Likes: 15

From: St. Cloud, MN

Car: 1984 Trans Am

Engine: LS1383 in work

Transmission: Magnum F - to be installed

Axle/Gears: Zexel Torsen 3.73, 28-spline mosers

Re: 86 firebird 2.8 fan not working...where to start

Quote:

Originally Posted by willexoIX

So what year was the change from ecm controlled fan to fan switch?

Everythign I've been able to find (hours of searching here on the site mainly) indicates 1988 was the year they started going to ECM controlled fans.

Feb 6, 2015 | 12:24 PM

#54

willexoIX

Banned

Joined: Nov 2008

Posts: 2,435

Likes: 1

From: Central Florida

Car: 89 Camaro RS running MS2X

Engine: .48/.60AR T3/T4 2.8L V6

Transmission: Rebuilt 700R4 2500 stall

Axle/Gears: Next to break...

Quote:

Originally Posted by Ozz1967

Everythign I've been able to find (hours of searching here on the site mainly) indicates 1988 was the year they started going to ECM controlled fans.

Thats interesting. My 89 never had the ecm controlled fan; was it different for firebirds?

Feb 6, 2015 | 12:42 PM

#55

mantaguy

Supreme Member

iTrader: (5)

Joined: Nov 2010

Posts: 5,892

Likes: 84

From: Mantua NJ

Car: 1 Owner 1986 TA with a WS6 package

Engine: 5.0 EFI

Transmission: THM700R4

Axle/Gears: 277 Posi Speedo

Re: 86 firebird 2.8 fan not working...where to start

All that info that I'm posting is from GM Pontiac 1986

Feb 6, 2015 | 12:45 PM

#56

willexoIX

Banned

Joined: Nov 2008

Posts: 2,435

Likes: 1

From: Central Florida

Car: 89 Camaro RS running MS2X

Engine: .48/.60AR T3/T4 2.8L V6

Transmission: Rebuilt 700R4 2500 stall

Axle/Gears: Next to break...

Quote:

Originally Posted by mantaguy

All that info that I'm posting is from GM 1986

So I guess the early cars had the ecm controlled fans, then the later ones didnt. At least thats what I gather, even though it makes more sense the other way around.