Overheating - Third Generation F-Body Message Boards


Cooling Discuss all of the aspects of cooling that you can think of! Radiators, transmissions, electric fans, etc.

Overheating

Reply
 
Thread Tools Search this Thread
Old 06-13-2018, 08:10 AM   #1  
Junior Member
Thread Starter
 
Join Date: May 2013
Location: Malvern
Posts: 35
Car: 1991 CamaroZ28
Engine: 305 TPI
Transmission: Auto
Axle/Gears: Stock

Overheating

This has probably been posted before and I'm sorry, but my Z will get really hot really quick. If I'mkm driving it around it will be fine but when it is jus sitting at idle it will warm up. Then when it gets to 185 it will just keep getting hotter till it goes way past 220. And I noticed that my second fan doesn't come on. Even when I put the a/c on, which doesn't work anyways. Is it a faulty coolant sensor. System had rust in it. I flushed it 4 times with thermocure cleaner. I'm still scratching my head. Any thoughts?
ZackZ420 is offline   Reply With Quote
Old 06-13-2018, 05:54 PM   #2  
Junior Member
 
PaulyC's Avatar
 
Join Date: Apr 2018
Location: Illinois
Posts: 58

Re: Overheating

Is your primary fan turning on? There are a couple of things to check here. First we can assume the thermostat is at least open and flowing or you would have an issue even when driving. So that points us to airflow which we are getting when the car is moving. If your primary fan is turning on I am suspicious the thermostat is sticking open. If your main fan is not turning on then we need to test the Fan fuse, relay and fan. The 1991 primary fan VIN F & VIN 8 is controlled by the ECU, which grounds the relay coil to turn the fan on. You can test this by grounding the Grn/Wht wire at the relay.
PaulyC is offline   Reply With Quote
Old 06-13-2018, 05:59 PM   #3  
Junior Member
Thread Starter
 
Join Date: May 2013
Location: Malvern
Posts: 35
Car: 1991 CamaroZ28
Engine: 305 TPI
Transmission: Auto
Axle/Gears: Stock

Re: Overheating

Yes my primary (drivers) side fan turns on. But not passenger side and it gets hot and it even boiled over into reservoir
ZackZ420 is offline   Reply With Quote
Old 06-13-2018, 06:45 PM   #4  
Junior Member
 
PaulyC's Avatar
 
Join Date: Apr 2018
Location: Illinois
Posts: 58

Re: Overheating

The secondary fan will turn on without the ecu and AC with a temp switch from the factory that will close at 238 degrees. If the temp is going above that then test the secondary fan circuit. You can jump the temp switch connector and second fan should turn on. If it still does not then check the relay, you can make a jumper wire and jump orange and blk/pnk at the relay connector which will bypass the relay. The orange is hot in run, jump it with the key off then turn the key on and the fan should start right away. The temp switch is located in the head between #6 and #8 cylinders.

If you get both fans running, still suspect the sticky tstat. Couple more things to consider there is a possibility we could be looking at a pump issue as well. If the coolant was real dirty the pump vanes could be dirty as well to the point of being inefficient at low speeds. You can try to bring the rpms up a bit while sitting still and see if it has an effect on the temp rise. This should go without saying but make sure the coolant is topped off.
PaulyC is offline   Reply With Quote
Old 06-15-2018, 06:11 AM   #5  
Junior Member
Thread Starter
 
Join Date: May 2013
Location: Malvern
Posts: 35
Car: 1991 CamaroZ28
Engine: 305 TPI
Transmission: Auto
Axle/Gears: Stock

Re: Overheating

And if it is a pump issue, what kind do you perfer? Ac Delco or gates?
ZackZ420 is offline   Reply With Quote
Old 06-15-2018, 06:27 AM   #6  
Junior Member
 
PaulyC's Avatar
 
Join Date: Apr 2018
Location: Illinois
Posts: 58

Re: Overheating

I’ve never had any issues with either of those two brands. I personally use AC Delco for stock part replacements whenever possible.
PaulyC is offline   Reply With Quote
Old 06-15-2018, 03:44 PM   #7  
Member
iTrader: (2)
 
Join Date: Mar 2010
Location: South FL
Posts: 399
Car: 1989 Formula T-Top
Engine: 350 TPI - twins are here!
Transmission: 700R4
Axle/Gears: 3.27

Re: Overheating

Is the radiator cap good meaning building pressure? Having a spare is cheap insurance.

Is the rad in good shape (lots of bent fins, maybe old or corroded).

Is there junk in front of the rad?

2nd fan comes on around 230. Remove the wire from the pax side sensor and ground it, fan 2 should come on.
TallTim is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Overheating Question JR91Conv Electronics 1 12-13-2001 10:33 AM
Amp overheating Buck Mustard Car Audio 3 07-14-2001 02:35 AM
alternator bearing overheating Dan91Z28 Aftermarket Product Review 1 06-22-2001 11:47 PM
CD Player Overheating mcconahay37 Car Audio 3 02-28-2001 04:09 PM
Overheating while idling, cooling fan is not coming on qaz Electronics 3 11-01-2000 07:13 AM


Go Back   Third Generation F-Body Message Boards >

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off


Advertising
Featured Sponsors
Vendor Directory

1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 03:27 PM.


All content copyright 1997 - 2018 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: