Search



Go Back   Third Generation F-Body Message Boards > Tech Boards > Cooling
Register Forgot Password?

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

Welcome to ThirdGen.org!
Welcome to ThirdGen.org.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!


Reply
 
Thread Tools Search this Thread
Old 07-13-2007, 10:14 PM   #1
Senior Member
 
'86 350's Avatar
 
Join Date: Nov 2005
Location: Tolland, CT
Posts: 577
Car: '86 Camaro SC

Classifieds Rating: (0)
Send a message via AIM to '86 350
Overheating problem on the emissions dyno.

Allright, here's the summary on my car. I've never, ever had an overheating problem with the car, it CONSTANTLY runs at about 175-180 during normal driving around town and on the highway, and if i'm in traffic or really driving the car hard, then it still never gets above about 210*. The car has a 180* stat in it and the fan turns on at 180* and off at 165* (I think).

Anyways, my registration expired last month, and when I went to renew it I was told I had to go through emissions. I didn't think much of it, so I just looked over the car, backed off the timing a tad, leaned out the idle mixture screws (didn't touch the jetting or metering rods/springs) and turned the idle up a little. I added a bottle of drygas to the tank and went off to the emissions test.

After about 2 minutes on the dyno the guy calls me over and goes, "it's getting a little hot, should I shut it down?" I glanced at the gauge and noticed it was just above the 250* mark. He shut it down, and after helping them with speedy dry on the shop floor, I went home and changed things. I turned the idle back down, and richened up the mixture screws. I re-topped off the coolant and went back to the test.

Once again after about 2 minutes the same thing happened. He called me over, this time again and it was at 250* again. I told him to shut it down and apologized for the problems i've been causing them and making a mess all over their shop floor (again).

At this point I noticed the electric fan wasn't kicking on. I've never had a problem with the fan until now. I replaced the relay, checked all the grounds and checked the fuse and everything checks out. There's one wire going into the radiator to measure coolant temp. It's for the fan, and not the one that goes into the cylinder head to actually send coolant temp to the gauge. Is it possible that sensor got ruined when it got too hot?

Also, i'm planning on flushing out the whole cooling system tomorrow, as well as replacing the thermostat housing (I checked and the thermostat is still good) since it leaks a little bit, and although the air leak might not do much, i'd just like to eliminate any possibiliities.

Obviously other then the fan, does anyone know why it would over heat like this? The first time the fan worked just fine and it still overheated, plus the coolant is only a year old.

-Thanks for your help, Brandon
__________________
Volvos:
1. 1984 Volvo 244 Turbo- .60/.63, K-jet trickery, other stuff.

2. 1976 Volvo 245- B23F on LH 2.2, M46, 4x4 status.
'86 350 is offline vBGarage Page   Reply With Quote
Old 07-14-2007, 09:48 AM   #2
Member
 
thedude's Avatar
 
Join Date: Oct 2006
Location: NJ
Posts: 229
Car: 85 Trans Am
Engine: LG4

Classifieds Rating: (0)
Re: Overheating problem on the emissions dyno.

Was a fan placed in front of the car? if not, that could cause some problems. In NJ, if it's above a certain temperature outside/in th shop, it's a law that a fan must be put in front of the car. The radiator may just have needed more air than the fans put trough it, since the engine had the extra load, without outside air coming in.
thedude is offline vBGarage Page   Reply With Quote
Old 07-14-2007, 09:53 AM   #3
Senior Member
 
'86 350's Avatar
 
Join Date: Nov 2005
Location: Tolland, CT
Posts: 577
Car: '86 Camaro SC

Classifieds Rating: (0)
Send a message via AIM to '86 350
Re: Overheating problem on the emissions dyno.

No, there wasn't a fan used in front of the car. It was about 90-95 degrees the day we went with a fair amount of humidity also.
'86 350 is offline vBGarage Page   Reply With Quote
Old 07-15-2007, 09:05 AM   #4
Member
 
Join Date: Apr 2006
Location: Central NJ
Posts: 123
Car: 1984 T/A
Engine: Chevrolet 355
Transmission: Borg Warner

Classifieds Rating: (0)
Re: Overheating problem on the emissions dyno.

I think you hit the nail there when you said "Under Normal Driving Conditions". Not sure if the factory designed the car for an extented stay on the dynamometer. I know the 85 and up cars are great at cooling

How long does the car have to stay on the dyno in CT?

Can you convert over to a pulley driven fan for the test?

I would "think" that the electric fan would kick in so it is good you are checking into that. For the dyno test this is really your only cooling flow (unless you convert to pulley driver fan).

The factory designed the electric fan "to assist" cooling the car in special situations (idling in traffic), not while the wheels are in motion because the air dam is directing the air into the radiator. In the case of the illustrious state inspection center, your vehicle is not actually in motion therefore not pulling in the outside air to cool the radiator.

You also want to make sure everything is working properly and you have enough coolant, etc.
cheppibear is offline vBGarage Page   Reply With Quote
Old 07-15-2007, 09:51 AM   #5
Supreme Member
 
rx7speed's Avatar
 
Join Date: Aug 2001
Location: Caldwell,ID
Posts: 5,373
Car: 2005 BMW 545i
Engine: 4.4L N62B44
Transmission: 6spd auto
Axle/Gears: Rotating

Classifieds Rating: (0)

Send a message via ICQ to rx7speed Send a message via AIM to rx7speed Send a message via MSN to rx7speed
Re: Overheating problem on the emissions dyno.

and how many of you guys have had the car idling warm when not under load much less putting a load on the engine without the extra air getting through the radiator?
__________________
www.txkingstock.com
imports are cool - r1cers suck
I play with my wankel
rotary---> <--- LS6
rx7speed is offline vBGarage Page   Reply With Quote
Old 07-15-2007, 10:12 PM   #6
Senior Member
 
'86 350's Avatar
 
Join Date: Nov 2005
Location: Tolland, CT
Posts: 577
Car: '86 Camaro SC

Classifieds Rating: (0)
Send a message via AIM to '86 350
Re: Overheating problem on the emissions dyno.

Quote:
Originally Posted by cheppibear View Post
I think you hit the nail there when you said "Under Normal Driving Conditions". Not sure if the factory designed the car for an extented stay on the dynamometer. I know the 85 and up cars are great at cooling

How long does the car have to stay on the dyno in CT?

Can you convert over to a pulley driven fan for the test?

I would "think" that the electric fan would kick in so it is good you are checking into that. For the dyno test this is really your only cooling flow (unless you convert to pulley driver fan).

The factory designed the electric fan "to assist" cooling the car in special situations (idling in traffic), not while the wheels are in motion because the air dam is directing the air into the radiator. In the case of the illustrious state inspection center, your vehicle is not actually in motion therefore not pulling in the outside air to cool the radiator.

You also want to make sure everything is working properly and you have enough coolant, etc.

The car isn't stock, the engine is an iron headed 355 SBC, i'm running an aluminum radiator right now, I checked the coolant level and that was fine, plus I tested in with a hydrometer and it passed too. I still think i'll flush it anyways though, just too elminate any variables.

I believe at the longest the test takes 3 minutes, but usually a car passes by the 2 minute or so mark.


Quote:
Originally Posted by rx7speed
and how many of you guys have had the car idling warm when not under load much less putting a load on the engine without the extra air getting through the radiator?
What? I'm not sure what your saying here.
'86 350 is offline vBGarage Page   Reply With Quote
Old 07-15-2007, 11:07 PM   #7
Senior Member
 
VenomX-87's Avatar
 
Join Date: Nov 2006
Location: Adelaide, Australia.
Posts: 651
Car: 1984 Trans-Am WS6
Engine: WAS: 5.0HO, SOON: ZZ383-425HP.
Transmission: 700R4 with shift kit

Classifieds Rating: (0)
Send a message via MSN to VenomX-87
Re: Overheating problem on the emissions dyno.

They are ment to put a fan infront of it, over here they have a big box like thing it is like a high flow aircon system. It keeps the car ICE cold when on the DYNO.
__________________
Home page: http://84transam.blogspot.com
Restoration page: http://84transamresto.blogspot.com

My Cars:
1984 (No Motor) Pontiac Trans-Am,
1987 (304ci V8) Holden VL Limited Edition.
VenomX-87 is offline vBGarage Page   Reply With Quote
Old 07-18-2007, 06:32 PM   #8
Senior Member
 
'86 350's Avatar
 
Join Date: Nov 2005
Location: Tolland, CT
Posts: 577
Car: '86 Camaro SC

Classifieds Rating: (0)
Send a message via AIM to '86 350
Re: Overheating problem on the emissions dyno.

Well, the first time when the car overheated I think I musta done something to the fan somehow. It won't turn on at all now no matter how hot the car gets.

I pulled the radiator today and flushed it, everything seemed fine, pulled off the water pump and everything was good there too.

When I went to take off the electric fan I accidentally pull out the wire going to what i'm assuming is the coolant temp sensor for the fan. It goes into the radiator and through the other side, and the wire went to the fan motor.

Does anyone know where I could get one of these sensors or how to replace it?
'86 350 is offline vBGarage Page   Reply With Quote
Old 07-19-2007, 11:07 PM   #9
Senior Member
 
'86 350's Avatar
 
Join Date: Nov 2005
Location: Tolland, CT
Posts: 577
Car: '86 Camaro SC

Classifieds Rating: (0)
Send a message via AIM to '86 350
Re: Overheating problem on the emissions dyno.

Quote:
Originally Posted by '86 350 View Post
Well, the first time when the car overheated I think I musta done something to the fan somehow. It won't turn on at all now no matter how hot the car gets.

I pulled the radiator today and flushed it, everything seemed fine, pulled off the water pump and everything was good there too.

When I went to take off the electric fan I accidentally pull out the wire going to what i'm assuming is the coolant temp sensor for the fan. It goes into the radiator and through the other side, and the wire went to the fan motor.

Does anyone know where I could get one of these sensors or how to replace it?
???
'86 350 is offline vBGarage Page   Reply With Quote
Old 07-19-2007, 11:35 PM   #10
Senior Member
 
VenomX-87's Avatar
 
Join Date: Nov 2006
Location: Adelaide, Australia.
Posts: 651
Car: 1984 Trans-Am WS6
Engine: WAS: 5.0HO, SOON: ZZ383-425HP.
Transmission: 700R4 with shift kit

Classifieds Rating: (0)
Send a message via MSN to VenomX-87
Re: Overheating problem on the emissions dyno.

Real easy fix, just ground that wire that went to the probe then the fan/fans will come on with ignition.
__________________
Home page: http://84transam.blogspot.com
Restoration page: http://84transamresto.blogspot.com

My Cars:
1984 (No Motor) Pontiac Trans-Am,
1987 (304ci V8) Holden VL Limited Edition.
VenomX-87 is offline vBGarage Page   Reply With Quote
Old 07-20-2007, 10:40 AM   #11
Member
 
Join Date: Aug 2006
Location: LONG ISLAND, NY
Posts: 418
Car: 1991 camaro rs convertible
Engine: 305 TBI
Transmission: 700R4

Classifieds Rating: (2)
Re: Overheating problem on the emissions dyno.

Yeah, that whole fan in front of the car while on the dyno is of key importance too. I bought my car to get tested last year to some bullshit garage, and not only did they not put a fan in front of my car on an 80 degree day but they almost let it over heat and didnt say a damn thing to me, and this was right after i rebuilt the motor, it was right at the red mark on the temp gauge, little to say i was pissed and i had to sit in the parking lot and let it cool down before i could leave.
camarorsssss is offline vBGarage Page   Reply With Quote
Old 07-20-2007, 12:21 PM   #12
Senior Member
 
'86 350's Avatar
 
Join Date: Nov 2005
Location: Tolland, CT
Posts: 577
Car: '86 Camaro SC

Classifieds Rating: (0)
Send a message via AIM to '86 350
Re: Overheating problem on the emissions dyno.

Quote:
Originally Posted by VenomX-87
Real easy fix, just ground that wire that went to the probe then the fan/fans will come on with ignition.
Okay, but say I don't want the fans to come on all the time, in the summer it'll be fine, but what about winter or something?


Quote:
Originally Posted by camarorsssss View Post
Yeah, that whole fan in front of the car while on the dyno is of key importance too. I bought my car to get tested last year to some bullshit garage, and not only did they not put a fan in front of my car on an 80 degree day but they almost let it over heat and didnt say a damn thing to me, and this was right after i rebuilt the motor, it was right at the red mark on the temp gauge, little to say i was pissed and i had to sit in the parking lot and let it cool down before i could leave.
I hear ya dude, that's EXACTLY what happened to me, I was in the parking lot for 15 minutes before I could start it up and leave again. Oh well, at least they didn't charge me and didn't really mind that my car pissed a few quearts of coolant all over their garage.
'86 350 is offline vBGarage Page   Reply With Quote
Old 07-25-2007, 11:45 PM   #13
Senior Member
 
'86 350's Avatar
 
Join Date: Nov 2005
Location: Tolland, CT
Posts: 577
Car: '86 Camaro SC

Classifieds Rating: (0)
Send a message via AIM to '86 350
Re: Overheating problem on the emissions dyno.

Allright, well I think the motor is gone in the electric fan, does that happen often? There's 2 wires coming out of the motor, one that went to a relay, and one that went to a ground. When I ground out the one wire and put the other to the battery, nothing happens, the motor doesn't engage or anything.

Is the motor gone or what?
'86 350 is offline vBGarage Page   Reply With Quote
Old 07-26-2007, 12:14 AM   #14
Supreme Member
 
DENN_SHAH's Avatar
 
Join Date: May 2004
Location: houston
Posts: 2,236
Car: 83 POS monte carlo
Engine: 92 5.7 tpi
Transmission: 700r4
Axle/Gears: 2.42

Classifieds Rating: (1)

Re: Overheating problem on the emissions dyno.

yep, your fan motor died, its not unusual.

after you know your fan is working right, when you go back, ask them to put their fan in front of the car too.
i don't know what the law is up there, but here its required.
DENN_SHAH is offline vBGarage Page   Reply With Quote
Old 07-27-2007, 10:41 AM   #15
Junior Member
 
Join Date: Aug 2005
Posts: 1
Car: red 88 camaro with t-tops
Engine: 305
Transmission: automatic

Classifieds Rating: (0)
Re: Overheating problem on the emissions dyno.

I just ran into the same problem. I have an 88. I went in this morning to get it emission tested, and after running it for a few minutes I was informed that it was overheating. After I got home, I opened the hood and the fan wasn't running. Glad to know I am not the only one with this problem!
Jammin88 is offline vBGarage Page   Reply With Quote
Old 07-27-2007, 10:41 AM
ThirdGen
1992 Camaro




Paid Advertisement


Reply

Go Back   Third Generation F-Body Message Boards > Tech Boards > Cooling

Tags
1012, 103012, car, cars, ct, dyno, emissions, emmissons, expired, inspection, long, overheating, problem, runs, test, vehicle, year
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

 


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 02:30 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
All content copyright 1997 - 2014 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.

Emails & Contact Details