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!

clutch and electrical fan

Old 01-26-2019, 03:11 PM
  #1  
Newbie
Thread Starter
 
Join Date: Jul 2018
Posts: 21
Model: Cherokee (XJ)
Default clutch and electrical fan

I am not sure how normal it is to have both, on all these radiator removal videos the people just have an electrical fan. I have both a clutch fan and electrical fan.


???
SXGT is offline  
Old 01-27-2019, 06:56 AM
  #2  
CF Veteran
 
peep's Avatar
 
Join Date: Oct 2010
Location: Ontario, Canada
Posts: 2,137
Year: 1989 Laredo
Model: Cherokee
Engine: 4.0 L 6 Renix
Default

On your XJ yes, that is normal, the electrical is an auxiliary and will come on/off at higher temps.
The XJ rad is short but wide.
The two fans cover the available area overall.
If you do off road water deep water crossing, consider changing out the clutch fan for a second elec. fan, switchable from in the cab.
If you won't be going in deep, then stock is great.
Watch older clutch fans for failure, can cause a big vibration.
Insure your fan shroud is secure, tendency for the screws to loosen.
peep is offline  
Old 01-27-2019, 11:09 AM
  #3  
CF Veteran
 
00t444e's Avatar
 
Join Date: Nov 2015
Location: Southern OH
Posts: 1,807
Year: 1997
Model: Cherokee(XJ)
Engine: 4.0
Default

If your going through deep water a lot then you would want to keep the clutch fan. Water can short out an electric fan motor.
00t444e is offline  
Old 01-29-2019, 09:36 AM
  #4  
Seasoned Member
 
Muddz's Avatar
 
Join Date: Nov 2013
Location: USA
Posts: 269
Year: 1995
Model: Grand Cherokee (ZJ)
Engine: 4.0L
Default

My ZJ 4.0L has a single viscous fan for it's downlfow radiator. The XJ's cross flow radiator normally requires a second (aux) fan, that comes on when conditions such as AC turned on, towing, road conditions change, such as steep grade, heavy sand, running constantly at lower rpms while off road, etc.

I prefer downflow rads as the crossflows imo are more sensitive and often run hotter when conditions change. My experience with the XJ crossflow it becomes sensitive to changes in drops in cooling system pressure. All rads require high pressure to keep the coolant at lower temp and preventing from boiling but imo the XJ crossflow is more sensitive than a downflow rad or at least ones I've used in the past.

The XJ with 4.0L coolant capacity is ~10.5 quarts (crossflow) and the ZJ with a 4.0L (downflow) is 12 quarts. Uses 1.5 quarts more coolant and only require a single viscous fan under all conditions. Some people modify the ZJ 4.0L fan from stock for more extreme conditions similar to the XJ 4.0L. But for general non extreme on and off road conditions the stock fans are usually adequate.

One modification for the XJ is to add a manual override switch to turn on and off the aux. fan instead of the allowing the PCM control the aux. fan from permanent temperature setpoints. On my 98 XJ 4.0L the pcm turns on the aux fan when the ac is running and also when the coolant temperature reaches 217 deg. F. the pcm then turns it off when coolant Temp. reaches 210 deg. F. The problem with PCM aux fan control is the PCM isn't able to predict road conditions and the fan turning on a 217 deg. F the engine ends up generally running at higher temperature and usually when at higher Temps 217 deg. F and higher when the engine is turned off engine / coolant Temps skyrocket and may take around 30 mins or so to cool off.

With a manual over-ride switch the driver, able to predict road conditions, can turn on the aux fan at around ~210 deg. F or less. so the engine runs generally cooler. With the manual over-ride switch I'm usually able to keep engine Temps at around
~210 deg. possibly less when in heavy sand, steep grades, towing, etc.

Last edited by Muddz; 01-29-2019 at 09:41 AM.
Muddz is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
mannydantyla
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
0
07-05-2018 09:52 AM
ekshamp
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
1
10-12-2017 01:29 PM
nascarguy320
Wanted
2
06-03-2013 08:12 AM
redrocket321go
Modified XJ Cherokee Tech
2
04-19-2013 09:25 AM
svt4me
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
16
06-03-2012 08:14 PM

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

Thread Tools
Search this Thread
Quick Reply: clutch and electrical fan


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: