Radiator Fan
Thread Starter
Burning Brakes
Joined: Feb 2007
Posts: 786
Likes: 6
From: Manassas VA/Flagler Beach FL
St. Jude Donor '13,'19
Radiator Fan
The 1985 Torch red project Vette is down again. Radiator fan this time. Seems simple enough, Does any one know how to diagnose and repair one? Which wires, relays and switches to check and how? It just doesn't come on, ever, whiles sitting in traffic and temp is rising into the two hundreds. Appreciate it!
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
It's only supposed to come on at 228 degrees, or when the a/c is on.
Do you have the secondary fan in front of the radiator also, or just the one primary fan?
The relay is on the inside of the drivers side fender liner, kinda closer to the brake master.
Do you have the secondary fan in front of the radiator also, or just the one primary fan?
The relay is on the inside of the drivers side fender liner, kinda closer to the brake master.
Instructor
Joined: Jul 2004
Posts: 132
Likes: 1
From: San Diego California
Stick a paperclip in terminal A and B of the ALDL and turn the key "on" (like checking for codes). This turns the main fan on and energizes several sensors and relays. The fan should run.
If you need to replace the fan. Here are the details on a new fan:
ACDELCO Part # 158498 {#22137318}
MOTOR KIT,ENG COOL FAN 150 WATTS; w/o FAN(B4P) or HVY DUTY CLG(V08)
If you need to replace the fan. Here are the details on a new fan:
ACDELCO Part # 158498 {#22137318}
MOTOR KIT,ENG COOL FAN 150 WATTS; w/o FAN(B4P) or HVY DUTY CLG(V08)
Thread Starter
Burning Brakes
Joined: Feb 2007
Posts: 786
Likes: 6
From: Manassas VA/Flagler Beach FL
St. Jude Donor '13,'19
When I recently checked the TSP voltage I shorted A & B of the ALDL and the fan didn't come on.
228 degrees seems alful hot. The anti-freeze is boiling by the. Rafiator gugling, etc.
Thanks! I'll check the relay.
228 degrees seems alful hot. The anti-freeze is boiling by the. Rafiator gugling, etc.
Thanks! I'll check the relay.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
228* is correct and your coolant WON'T boil at 228*. That's why they call it coolant, it raises the boiling point.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
You can either reprogram the chip.
Or install a fan switch. This can either be an override switch, that lets you force it on from in the car,
or it can be an aftermarket temperature switch from Ecklers that automatically turns the fan on at a certain temp. Some places even have adjustable ones.
Or install a fan switch. This can either be an override switch, that lets you force it on from in the car,
or it can be an aftermarket temperature switch from Ecklers that automatically turns the fan on at a certain temp. Some places even have adjustable ones.
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Thread Starter
Burning Brakes
Joined: Feb 2007
Posts: 786
Likes: 6
From: Manassas VA/Flagler Beach FL
St. Jude Donor '13,'19
I read a thread about the switch. Thought it was the A/C - heat fan they were talking about.
Aftermarket adjustible switch from Ecklers huh? Where do you install it? Ecklers on the Internet?
Brian - You sure its supposed to come om with pins A & B shorted? Don't think it does. How do I narrow it down to the motor. Fuse is good. I'm going to go beat on the relay!
Aftermarket adjustible switch from Ecklers huh? Where do you install it? Ecklers on the Internet?
Brian - You sure its supposed to come om with pins A & B shorted? Don't think it does. How do I narrow it down to the motor. Fuse is good. I'm going to go beat on the relay!
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
I read a thread about the switch. Thought it was the A/C - heat fan they were talking about.
Aftermarket adjustible switch from Ecklers huh? Where do you install it? Ecklers on the Internet?
Brian - You sure its supposed to come om with pins A & B shorted? Don't think it does. How do I narrow it down to the motor. Fuse is good. I'm going to go beat on the relay!
Aftermarket adjustible switch from Ecklers huh? Where do you install it? Ecklers on the Internet?
Brian - You sure its supposed to come om with pins A & B shorted? Don't think it does. How do I narrow it down to the motor. Fuse is good. I'm going to go beat on the relay!
Yes, its supposed to come on with the top right pins jumpered and key on. When you do this, the ECM grounds the fan relay, and most of the other stuff on the car. Brian knows his stuff on cooling fans.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
I read a thread about the switch. Thought it was the A/C - heat fan they were talking about.
Aftermarket adjustible switch from Ecklers huh? Where do you install it? Ecklers on the Internet?
Brian - You sure its supposed to come om with pins A & B shorted? Don't think it does. How do I narrow it down to the motor. Fuse is good. I'm going to go beat on the relay!
Aftermarket adjustible switch from Ecklers huh? Where do you install it? Ecklers on the Internet?
Brian - You sure its supposed to come om with pins A & B shorted? Don't think it does. How do I narrow it down to the motor. Fuse is good. I'm going to go beat on the relay!
Thread Starter
Burning Brakes
Joined: Feb 2007
Posts: 786
Likes: 6
From: Manassas VA/Flagler Beach FL
St. Jude Donor '13,'19
Thanks! Found and am ordering the low temp switch on Ecklers.
I have a Haynes manual.
I'll get a relay (cheap) today at Autozone (only store open). If that doen't do it, then I'll check the fan motor
I have a Haynes manual.
I'll get a relay (cheap) today at Autozone (only store open). If that doen't do it, then I'll check the fan motor