Radiator Boilover - I'm stumped - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 03-03-2004, 06:12 PM
Bill Ford's Avatar
Member
 
Join Date: Oct 2002
Location: Greenwood, LA
Posts: 31
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Radiator Boilover - I'm stumped

Installed the Heat and A/C unit on a new chevy crate 350 that had been running with no overheating problems. All I did was remove the plugs from the manifold and water pump, replace them with heater hose barbs and hooked up the heater hoses. I also replaced the thermostat housing gasket which had been leaking a little.

I drained the water/antifreeze from the bottom of the radiator and replaced it after making all the connections. After cranking and running the engine for about five minutes to allow warm-up, I noticed coolant coming from the over-flow tube. Thinking this was just extra coolant being pushed out by expansion, I drove it about 1/4 mile or so and stopped to talk to a friend - it was still pushing coolant out at a rapid rate. I shut it off and let it cool a bit, we could hear boiling in the radiator. Drove it back home and let it cool again, removed the cap and added water to refill the radiator.

Cranked it up again, with the cap loose, and after about 3 or 4 minutes it began to gush out the radiator fill. I bet it pushed out a gallon in 30 seconds or so. Thinking I had an air bubble in the system, I let it set a few minutes and filled it up again. Left the cap off this time and cranked it up again - same thing, water gushing out the radiator.

Any ideas what's happening?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 03-03-2004, 06:51 PM
FASTCHEVY's Avatar
RatRod B4 RatRods were Cool
 
Last photo:
Join Date: Feb 2004
Location: Dallas Texas
Age: 32
Posts: 800
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
It sounds like the radiator cap is bad. they go bad pretty often with me.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 03-03-2004, 07:05 PM
Pony's Avatar
Member
 
Last photo:
Join Date: Sep 2003
Location: Lynnwood, Wa.
Age: 68
Posts: 721
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Sounds like a thermostat problem. In upside down, left out or just plain bad. Top it of cold and start it cap off, after a minuate or two grasp the top hose firmly but don't colapse it, ( DO NOT get tagged by the fan doing this!) when the thermostat opens at it's opperating temprature you should feel water start to flow thru the hose and into the radiator (with the cap off you will see it to). When the thermostat opens the water level will drop also, as it does top it off. If this Does Not happen, you have a problem with the thermostat not allowing the water to circulate and cool as it should. No circulation = the water in the block boiling and reliving pressure back thru the lower hose an out the top of the radiator.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 03-03-2004, 07:05 PM
dmorris1200's Avatar
doesn't play well with others
 
Last photo:
Join Date: Feb 2002
Location: Maine
Age: 49
Posts: 1,834
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Sounds like she might just be airbound. Did you follow procedure for burping her after refilling the system?

__________________
BUILT FORD TOUGH
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 03-03-2004, 07:13 PM
302 Z28's Avatar  
Last photo:
Join Date: May 2003
Location: North Texas
Posts: 10,840
Wiki Edits: 0

Thanks: 1
Thanked 86 Times in 73 Posts
I think dmorris1200 has hit the nail on the head. That is my guess also.

Vince
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 03-03-2004, 07:39 PM
BattlestarOne's Avatar
9 Second '63
 
Last photo:
Join Date: Dec 2003
Location: Pennsylvania
Age: 64
Posts: 15
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Sometimes jacking up the front end of the car to get the radiator fill point as high as possible will help. The bubble will sometimes find it's way to the top if you give it some help.....let it idle while slowly filling the radiator.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 03-03-2004, 08:21 PM
4 Jaw Chuck's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Mar 2002
Location: Manitoba, Canada
Age: 46
Posts: 4,974
Wiki Edits: 0

Thanks: 2
Thanked 89 Times in 72 Posts
Quote:
Originally posted by dmorris1200
Sounds like she might just be airbound. Did you follow procedure for burping her after refilling the system?

Ditto.
__________________
Outlawed tunes from outlawed pipes
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 03-03-2004, 09:55 PM
poncho62's Avatar
Out of the Loop Moderator
 
Last wiki edit: Streetbeasts links
Last journal entry: at car show
Last photo:
Join Date: Oct 2003
Location: Hanover, Ontario, Canada
Age: 62
Posts: 16,899
Wiki Edits: 5

Thanks: 20
Thanked 261 Times in 213 Posts
Typical airlock..........

Drain some coolant out, start it up, bring up to temp and fill slowly with it running. That should cure it.
__________________
Ontario Rodders

Budget RVs
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 03-04-2004, 06:09 PM
Bill Ford's Avatar
Member
 
Join Date: Oct 2002
Location: Greenwood, LA
Posts: 31
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks for all the advice, guys. Turned out to be a stuck thermostat - last thing I thought of on a new crate engine. I didn't know a stuck thermostat could cause a boil-over so quickly.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 03-04-2004, 06:53 PM
dmorris1200's Avatar
doesn't play well with others
 
Last photo:
Join Date: Feb 2002
Location: Maine
Age: 49
Posts: 1,834
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Well it certainly doesn't make sense that a thermostat would fail simply because you changed the housing gasket since you did say she ran fine before you worked on her. Guess you never know. Maybe it was damaged when you pulled it apart. At least it's ok now.


__________________
BUILT FORD TOUGH
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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 -6. The time now is 07:24 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.