Radiator Low in '84 CJ7 258 - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 08-17-2004, 12:10 PM Thread Starter
Addict
 
84_CJ7's Avatar
 
Join Date: Jun 2003
Location: Valdosta, Georgia
Posts: 413
Thanks: 3
Thanked 0 Times in 0 Posts
 
Radiator Low in \'84 CJ7 258

The radiator is running low in my '84 CJ7 258. It has the stock radiator and overflow tank. The overflow tank is full (more than full) but it doesn't pull the coolant back into the radiator after cooling down. I replaced the radiator cap (15 lbs) on the chance that it wasn't allowing the return. It appears to have helped, but still falls short of refilling the the radiator. I can find no leaks and the thing runs like a top. Any ideas?

Scott
84_CJ7 is offline  
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 08-17-2004, 12:20 PM
Keyboard Implanted
 
Join Date: Aug 2001
Location: Vermont
Posts: 2,348
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Radiator Low in \'84 CJ7 258

When you replaced the Rad cap, did you replace the soft rubber line that runs from the Rad to the overflow bottle. If that line is old, it may be cracked in places. When the fluid cools down and sucks on that tube, if it has cracks the Rad will suck only air, and not the fluid out of the overflow bottle. even if you can not see visable cracks in the line, if it is old, replace it. All it would take to cause a problem like you descrive would be a couple of pin holes.
Olin18 is offline  
post #3 of (permalink) Old 08-17-2004, 12:22 PM
Journeyman
 
Join Date: Nov 2002
Location: Maryland
Posts: 118
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Radiator Low in \'84 CJ7 258

Maybe a small leak somewhere in the system so you are sucking in some air rather than from the overflow. Check out hoses, water pump and heater core. If your hoses are at the end of their expected life I would replace them as a first step if you don't find anything on close inspection. After that all I could say is leak test it with dye.
bleoh is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 08-17-2004, 12:32 PM Thread Starter
Addict
 
84_CJ7's Avatar
 
Join Date: Jun 2003
Location: Valdosta, Georgia
Posts: 413
Thanks: 3
Thanked 0 Times in 0 Posts
 
Re: Radiator Low in \'84 CJ7 258

Sometimes I can't see the forest for the trees. I checked the return line for obstructions but not for pin-holes. That replacement is first on my list. Thanks.

New (7 mos) heater core and heater hose. Replaced the thermostat at the same time. No water pump leaks. I guess those big hoses need to be relieved of duty next. Thanks.

Scott
84_CJ7 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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

 
For the best viewing experience please update your browser to Google Chrome