over heating due to the radiator fan

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Oct 18, 2008 | 04:07 PM

JMR

Thread Starter

Senior Member

Joined: Jan 2008

Posts: 519

Likes: 0

From: SoCal 909

Car: 91 RS vert/ 89 iroc vert

Engine: 305 TBI/305 TPI

Transmission: 700r4Xtwo

Axle/Gears: 10 bolt non-pos. B/W 9 bolt pos

over heating due to the radiator fan

I replaced the motor because it gave out then checked the fuse which was fine so I cant figure out the problem that is causing the fan to turn on when the ignition switch is on but immediately turns off when the engine is on please help is my daily

Oct 19, 2008 | 09:44 AM

Matthew91-Z28

Supreme Member

Joined: May 2002

Posts: 1,333

Likes: 1

From: Texas

Car: 1991 Z28 Convertible

Engine: 350 TPI

Transmission: 700R4

Axle/Gears: 3.23 with Eaton posi

Re: over heating due to the radiator fan

what you got?

dual fans?
any modifications to cooling?
there is a good article in the tech section on cooling systems for both single and dual set-ups.

You say it does not turn on when you start the car? its really not supposed to unless you have it wired to run like like that.

Now, if it NEVER turns on, then you have a problem.

So, does the fan turn on when the engine reaches 220 deg F?

Oct 23, 2008 | 10:36 PM

Jim Berry

Senior Member

Joined: May 2001

Posts: 552

Likes: 0

From: San Antonio, Texas

Car: '86 Trans Am

Engine: LG4

Transmission: 700R4

Axle/Gears: 3.70 Posi disc 9 bolt

Re: over heating due to the radiator fan

Sounds like the previous owner has bypassed the fan relay and jumpered the fan directly to a line that is hot when the ignition is on.

I had problems with my relay. Keep burning them out. Ordered one from my local pontiac dealer.

JB.