Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here! ZJ (93-98), WJ (99-04), WK (05+)
All ZJ/WJ/WK specific tech questions asked here!

Cooling System Issues

Old 02-10-2019, 07:19 PM
  #1  
Senior Member
Thread Starter
 
Join Date: Dec 2017
Location: Calgary, AB
Posts: 605
Year: 1998
Model: Grand Cherokee (ZJ)
Engine: 5.2
Default Cooling System Issues

Had an issue with a near boil over the other day when its been -25 celsius where I live.

I thought maybe the thermostat so I swapped that out and now when I run it for short periods of time I can get the lower hose warm, upper hose hot and the radiator relatively hot.

If I go for any long period of a drive the radiator becomes stone cold as does the lower rad hose again.

I've changed the radiator, water pump and thermostat. I have not changed the fan clutch yet though but thinking that could be an issue?

When the truck has been running and then cools down if I try to turn the fan blade I simply can't and it won't move.

My understanding is when a fan clutch is cold it should spin freely for 1.5-2 turns?

Trying to get this thing reliable again
firebane is offline  
Old 02-12-2019, 01:07 AM
  #2  
Member
 
Hatsuwr's Avatar
 
Join Date: Aug 2016
Location: Maryland
Posts: 205
Year: 1996
Model: Grand Cherokee
Engine: 4.0 I6
Default

That's cold... A coolant mixture that is less than ~40% antifreeze or more than ~90% antifreeze will be frozen at -25 C. Contaminants may raise or lower that freeze point, so it's best not to be close to either end. Lowest freezing point is achieved between 60%-70% antifreeze.
You sure your ratio is correct?

Fan clutch sounds like it might be faulty, but that shouldn't cause the problem (by itself at least).

Is there any chance your lower radiator hose is collapsing when the pump starts spinning faster?

Just curious, what was the indication that you were near a boil over?
Hatsuwr is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
purplegorillaxj
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
18
10-08-2014 10:17 PM
levi_v
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
22
07-30-2014 06:25 PM
SkippyThe
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
7
04-07-2014 08:35 PM
classicxj2000
Modified XJ Cherokee Tech
10
10-13-2011 01:42 PM
DeadCellM60
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
1
07-18-2011 12:36 AM

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

Thread Tools
Search this Thread
Quick Reply: Cooling System Issues


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

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: