Go Back   CamaroZ28.Com Message Board > 1967-2002 Powertrain Discussion > 3rd Gen / L98 Engine Tech
Sign in using an external account
Register Forgot Password?

Reply Post New Thread
LinkBack Thread Tools Search this Thread Display Modes
Old 10-07-2005, 01:01 AM   #1
Registered User
Join Date: Oct 1998
Location: Nj
Posts: 170
Post 1992 Cooling Fans Schematics - Help Diagnose Fans Not Turning ON

hey everyone moving this into the thirdgen section...

Hi everyone, well I just got my car back from the autobody repainted etc. Ok so I reinstalled my fans and the whole nine. I had originally removed all that stuff to make the painting of the car easier for the painters.

well my primary fan does not come on when the car gets hot. My Heavy duty cooling fan does kick on at 240 like is suppose to but the primary does not kick on at all. I plugged in the scan tool into the ALDL and turned the key to run and as I found out in the book that energizes all relays (except the fuel pump) and that turned on my primary fan. So the fan motor is working.

Now I know what you are thinking its the coolant temperature sensor at the front of the block. well I changed that sensor about 8 months ago with one from autozone it was a "Wells" brand. Now I am questioning whether that was wise or not. I also changed the heavy duty coolant fan switch at the rear of the passenger block (again with a wells) and finally I yesterday I changed the coolant temperature sender (the one the sends readings to the temp gauge)

Primary fan again is not kicking on. So either my guage is messed up and or the sensor is messed up and or of course one of my wires is bad from what I have gathered at this point.

Does anyone know if there is a way to check the temp that the sensor is registering? I read that a thermometer is an option (maybe I can go buy one at pepboys or something)

Any other suggestions would be greatly appreciated

Fan Schematics that I scanned:
General Overview of Fans

Chart C-12 - Fan Schematics Overview 1of2

Chart C-12 - Fan Trouble Shooting Chart 1of2

Chart C-12 - Fan Schematics Overview 2of2

Chart C-12 - Fan Trouble Shooting Chart 2of2

Fan Relay 1 Overview

Fan Relay 2 Overview (Heavy Duty Fan Relay)

Ok so there it is dam that took some time but def hope it helps others out there!
This ad is not displayed to registered members.
Register your free account today and become a member on CamaroZ28.com!
1991 RS Convertible

1992 z-28 350:
Borla Adjustable Exhaust - Moog Front Suspension - 18" Chrome Iroc Wheels - K&N Air Filters - Cooling Fan Switch

Last edited by Castro; 10-07-2005 at 01:11 AM.
Castro is offline   Reply With Quote
Old 10-08-2005, 02:43 AM   #2
Registered User
Join Date: May 2003
Posts: 158
Re: 1992 Cooling Fans Schematics - Help Diagnose Fans Not Turning ON

The scan tool should also read the coolant temp sensor, unless it just a code scanner.
Barring a wiring problem, the ECM is at fault, it's probably sending the signal to turn on the primary fan, but the relay driver isn't pulling the negative side of the relay coil to ground.
88' IROCZ 388/6.4L TPI Motown 350/4-bolt main stroker....and then some.
raul.garcia is offline   Reply With Quote
Old 10-09-2005, 10:53 AM   #3
Registered User
90rocz's Avatar
Join Date: Feb 1999
Location: Springfield,OH. U.S.A.
Posts: 2,943
Re: 1992 Cooling Fans Schematics - Help Diagnose Fans Not Turning ON

Well, if you short the ALDL and it comes on, the relay and fan and wiring are good, so it must be the Coolant Temp Sender "yellow and black wires"...or ECM.
Don't use teflon tape or sealer on the threads, it might not ground properly.
Autozone can scan it for free, and use monitor mode to see real time data to see what your sensor sees.
1990 IROCZ, 1994 Z28-ASE Certified Auto Tech
"There is one rule for the industrialist and that is: Make the best quality of goods possible at the lowest cost possible, paying the highest wages possible."Henry Ford

Last edited by 90rocz; 10-09-2005 at 11:04 AM.
90rocz is offline   Reply With Quote
Old 10-09-2005, 10:53 AM
Reply Post New Thread

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -5. The time now is 04:44 AM.

Copyright © 1996-2013 CamaroZ28.Com. All rights reserved.

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.