interesting cooling problem (bubble?) - Third Generation F-Body Message Boards


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

interesting cooling problem (bubble?)

Reply
 
Thread Tools Search this Thread
Old 06-15-2017, 10:20 AM   #1
Junior Member
Thread Starter
 
Join Date: Oct 2006
Posts: 19


interesting cooling problem (bubble?)

Car 1990 GTA 305 5 speed.
This has now happened a couple of times this year. Again yesterday. I live in the low hills above Riverside Ca. I went to lunch with friends downtown. About 1000 feet lower.
The temp indicated about 200 degrees with the ac on and 85 degrees out. Perfect going downhill. Returning home a couple of hours later. Outside temp 96 degrees.
Going uphill car temp went up to 220 and climbed to about 240. AC was on but was not very cool. The climb back up is pretty steep.I'm guessing maybe an bubble that moves around? I will be doing a burping this weekend.

Any guesses or advice is greatly appreciated.

Bob
2mnytys is offline vBGarage Page   Reply With Quote
Old 06-15-2017, 02:20 PM   #2
Member
iTrader: (3)
 
dlinger's Avatar
 
Join Date: May 2012
Location: Laurel, MT
Posts: 162
Car: 1984 Z28 HO
Engine: 305
Transmission: 700R4
Axle/Gears: 3.73

Re: interesting cooling problem (bubble?)

What speed were you traveling? What type of fan do you have? Is engine stock? Mileage on car? When was coolant serviced last? How does it operate normally in stop and go driving? How does it operate on highway (non-stop speeds above 45)?

Cars tend to operate hotter going up hill due to load. I had a 97 Transport that would get real hot going up mountain passes at highway speeds. I would usually turn off AC to help some. If it was slower speed up hill I would actually turn on the AC to bring electric fan on sooner (not sure if that is correct to do).

If it has been awhile since you replaced coolant, maybe flush the system.
dlinger is offline vBGarage Page   Reply With Quote
Old 06-15-2017, 05:46 PM   #3
Junior Member
Thread Starter
 
Join Date: Oct 2006
Posts: 19


Re: interesting cooling problem (bubble?)

Hi Thanks for answering.

Speed was in town and about 45 mph. Had more stop and go going to lunch.
Stock 305 as far as I know.
One thing I did not mention originally is yesterday morning I simple greened and hosed the rad and AC rad.

Normal operating temp is around 215 all the time. Maybe 220 if going a little slower, in town or getting in traffic on the freeway.

Dual fans both which were on. Milage is 101,000 or close to that.

Coolant and thermostat both have less than 1000 miles on them.
I have not done a engine flush since I bought the car about 10 years ago or about 6000 miles.
Maybe I should dump the coolant if the burping does not work.

Then this brings up the next question. What is the best way to a flush and what agent to use?

†hanks again and any other ideas would be greatly appreciated.

Bob
2mnytys is offline vBGarage Page   Reply With Quote
Old 06-15-2017, 09:19 PM   #4
Senior Member
 
Join Date: Mar 2017
Posts: 558

Re: interesting cooling problem (bubble?)

Is your front air dam in place?

If it starts to climb over 220 you should turn the AC off and turn on the heater. This will help cool it down. I know it doesn't seem like much from 220 to 240 but that much extra temp in your OIL will drop you approximately a full weight in viscosity and pulling hills like that is high, high load. That should be avoided if at all possible. If you drop from a 30 to a 20 and are heavily loading the engine, a little detonation is all it takes to damage a rod bearing.

GD
GeneralDisorder is online now vBGarage Page   Reply With Quote
Old 06-15-2017, 09:28 PM   #5
Junior Member
Thread Starter
 
Join Date: Oct 2006
Posts: 19


Re: interesting cooling problem (bubble?)

Air Dam is in place a little beat up but it should be doing what it is supposed to do.

Will do on the AC.

Thanks

Bob
2mnytys is offline vBGarage Page   Reply With Quote
Old 06-16-2017, 08:32 AM   #6
Member
iTrader: (3)
 
dlinger's Avatar
 
Join Date: May 2012
Location: Laurel, MT
Posts: 162
Car: 1984 Z28 HO
Engine: 305
Transmission: 700R4
Axle/Gears: 3.73

Re: interesting cooling problem (bubble?)

If it was mine, I would flush the coolant system. That many miles it's not going to hurt. I am going to do our 84 this summer. It has pretty new coolant, radiator and pump. When I did that I tried to run hose water through it. New coolant discolored pretty fast, so I did not get it good enough.

Temps seem high to me, but I am in MT and we don't get temps you do. On my 95, highway speed my gauge stays on 195. Under 45 it will cycle with the fans. Both fans do not come on until about 220 unless AC is on. It will sometimes go some higher but drops right away. When I was commenting to my friend (GM mechanic in the 90's) about the high temp, he said don't worry about it, it is designed to work that way. And it has for the 13 years I have owned it.

Your gauges may not be spot on accurate which as I have read on 3rd Gen is common.
dlinger is offline vBGarage Page   Reply With Quote
Old 06-16-2017, 08:44 AM   #7
Junior Member
Thread Starter
 
Join Date: Oct 2006
Posts: 19


Re: interesting cooling problem (bubble?)

Thanks again
Im going to do the burping this morning . It is going to be in the triple digits till next week, like 115 on Tuesday, (summer is here). Will see if that helps.
Have you used any of the system cleaners? Used to use prestone cleaner but there are more out there,

Bob
2mnytys is offline vBGarage Page   Reply With Quote
Old 06-16-2017, 11:52 AM   #8
Supreme Member
 
redneckjoe's Avatar
 
Join Date: Sep 2011
Location: port richey, Fl.
Posts: 1,961
Car: 87 iroc-z
Engine: carb 350
Transmission: th350
Axle/Gears: 3.73

Re: interesting cooling problem (bubble?)

if your worried about trapped air, drill 2 or 3, 1/8" holes on the edges of the thermostat. it will burp any trapped air out and lets a small amount of coolant to always circulate.
i've found "water wetter" to be good for a 10 degree drop in temps.
https://www.redlineoil.com/product.aspx?pid=74&pcid=10
redneckjoe is offline vBGarage Page   Reply With Quote
Old 06-16-2017, 12:22 PM   #9
Junior Member
Thread Starter
 
Join Date: Oct 2006
Posts: 19


Re: interesting cooling problem (bubble?)

Thanks. I will add the drilling of holes as a project "most soonest". I do use water wetter and hopefully it is helping.

Update on burping. I did the procedure that I found here on third gen. Adding coolant in a small amount twice. Topped up the Rad. and overflow tank. Took a test drive to the same place as the other day with same condition but nor as hot. Have to out later in the day this weekend. Anyway the car stayed about 200 going down hill and coming back up it went up to about 215 going 45. At about 50 it dropped some maybe 210.
For today i would call it a success at least till I can test it when it is over 100 out.
In the garage tested with the laser temp gauge at the thermostat housing I was getting 208 average with the motor running.
On to the the project

Bob
2mnytys is offline vBGarage Page   Reply With Quote
Old 06-16-2017, 12:38 PM   #10
Senior Member
 
Join Date: Mar 2017
Posts: 558

Re: interesting cooling problem (bubble?)

Amsoil has a product called Coolant Booster that beats the Redline product in independent testing. Basically the same price. You only need half the bottle for a 3rd gen running glycol mix. Lots of my customers run this with plain water for the track (Glycol not allowed on the track).

http://www.amsoil.com/shop/by-produc...coolant-boost/

GD
GeneralDisorder is online now vBGarage Page   Reply With Quote
Old 06-17-2017, 08:39 PM   #11
Supreme Member
 
Join Date: Jan 2004
Location: So. Ohio
Posts: 1,773
Car: 88 Camaro
Engine: L98 350
Transmission: 700r4


Re: interesting cooling problem (bubble?)

Have you looked between the radiator and AC condensor? Have seen leaves and trash actually build up in there halfway to the top. No way for that stuff to get in there, it just does. Just a thought.....
tom3 is offline vBGarage Page   Reply With Quote
Reply


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



All times are GMT -5. The time now is 10:31 PM.


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.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: