1984 Cooling fan problem
Thread Starter
Drifting
Joined: Feb 2013
Posts: 1,465
Likes: 48
So today I decide to try to determine if the fan motors are NFG. So I run positive and negative leads from my Corvette to my lumina and connect the leads to the fans in the Lumina. The fans run and do not blow the fuse. So it must be the fan motor.
I change the fan motor and it runs for about a half a second and then blows the fuse.
Keep in mind. The wire from the fuse box to the connector is new.
The connector is diconnected from the relay. I am running a wire directly to the fan motor.
No switch.
No relay.
Any ideas?
Don't fprget up until a couple of days ago it was running fine.
Oh and I tried a 10 A rather than the 3 A fuse.
I can bypass the fuse but just hate to do it.
I change the fan motor and it runs for about a half a second and then blows the fuse.
Keep in mind. The wire from the fuse box to the connector is new.
The connector is diconnected from the relay. I am running a wire directly to the fan motor.
No switch.
No relay.
Any ideas?
Don't fprget up until a couple of days ago it was running fine.
Oh and I tried a 10 A rather than the 3 A fuse.
I can bypass the fuse but just hate to do it.
Thread Starter
Drifting
Joined: Feb 2013
Posts: 1,465
Likes: 48
connector
I did actually think of the connector. But the battery lead in the connector is loose. so I pushed it out of the connector. Right now it is a wire with a clip on it. I connected a lead to it, the battery lead from the connector and ran it to the fan. And it blew the ciriuit. Good try thank you
Thread Starter
Drifting
Joined: Feb 2013
Posts: 1,465
Likes: 48
Yet I ran those same wires to my Lumina fan and the fan ran and did not blow the fuse, whatsup!!
Thank you for the help
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
Refer diagram above;there are 2 "power" wires at the relay connector
A red that powers the motor and a blue that powers the relay
If you used the blue it would blow the fuse because the fusible link (fuse for the fan motor ) is 30 A and the one for the relay control in the dash box is only 3A
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
The fan motor does not run on that 3A fused wire from the fuse box ,the fan has it own separate supply
from the battery that is controlled by the relay operated by the fuse you are blowing
The dash fuse is for relay control ONLY
Thread Starter
Drifting
Joined: Feb 2013
Posts: 1,465
Likes: 48
I thought that the blue wire was part of the feed back from the Coolant Switch or AC. So what I should be doing is tracing the blue wire and looking for a short in it. I thought that the red wire was the only supply of power. Thank you. I will be on it this weekend.
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
1.Power from the battery through the relay to the fan motor
2.The power from the dash fuse that operates the relay when that circuit is grounded by the switch.
The only thing they have in common is they both pass through the relay
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