Why are my shift solenoids and blower resistor getting fried? - Jeep Cherokee Forum

Go Back  Jeep Cherokee Forum > Technical Discussion > Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
Why are my shift solenoids and blower resistor getting fried? >

Why are my shift solenoids and blower resistor getting fried?

Notices
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here XJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
Sponsored by:
Sponsored by:

Why are my shift solenoids and blower resistor getting fried?

Old 02-11-2019, 01:37 PM
  #1  
Member
Thread Starter
 
Join Date: Apr 2015
Location: Lhasa, Tibet
Posts: 166
Year: 1997
Model: Cherokee
Engine: 4.0 inline 6
Default Why are my shift solenoids and blower resistor getting fried?

Guys/Gals,

I have replaced my shift solenoids twice so far, in about 4 years. The symptom is 3rd gear starts getting hesitant about shifting, and then eventually stops completely. Replacing the solenoids fixes this.

Also, the blower resister has been replaced twice. It fries everything except setting 4 (where there is no resistance).

Can anyone suggest what would be causing this problem? Is there something causing too much voltage or something?

1997 XJ 4x4 (AW4) I6
Stock
mtyson is offline  
Old 02-11-2019, 02:16 PM
  #2  
CF Veteran
 
jordan96xj's Avatar
 
Join Date: Dec 2015
Location: Syracuse, NY
Posts: 1,669
Year: 1996
Model: Cherokee (XJ)
Engine: 4.0L
Default

Here is some solenoid troubleshooting information:

http://www.rossdecco.com/solenoid-troubleshooting.html

Given your description, it is probably more likely that the voltage is actually too low, so the solenoid never closes and the amperage continues to flow (current) which burns out the solenoid. There is some information at that link above to help identify between low and high voltage problems.

I don't immediately see how the two problems you mention would be related. Normally what keeps the fan resister from melting down is the fan itself. The resister is positioned in the airstream of the fan wheel so that it is cooled at the same time it is resisting (like a hairdryer heating element basically). Is it possible that the airflow down there is not very good?

Have you used a multimeter to test your system voltage while the vehicle is running? When was the last time you cleaned up all of your accessible electrical connections under the hood?
jordan96xj is offline  
Old 02-11-2019, 03:04 PM
  #3  
CF Veteran
 
Join Date: Nov 2017
Location: Groton, MA
Posts: 2,511
Year: 1995
Model: Cherokee(XJ)
Engine: I6 4.0L
Default

Originally Posted by jordan96xj View Post
Here is some solenoid troubleshooting information:

http://www.rossdecco.com/solenoid-troubleshooting.html

Given your description, it is probably more likely that the voltage is actually too low, so the solenoid never closes and the amperage continues to flow (current) which burns out the solenoid. There is some information at that link above to help identify between low and high voltage problems.

I don't immediately see how the two problems you mention would be related. Normally what keeps the fan resister from melting down is the fan itself. The resister is positioned in the airstream of the fan wheel so that it is cooled at the same time it is resisting (like a hairdryer heating element basically). Is it possible that the airflow down there is not very good?

Have you used a multimeter to test your system voltage while the vehicle is running? When was the last time you cleaned up all of your accessible electrical connections under the hood?
X2

Blown blower motor resistor is usually due to the blower motor being worn and drawing too much power. This also usually leads to melting of the wiring around that area (which if not corrected will lead to subsequent resistor failures - or the appearance thereof).
PatHenry is offline  
Old 02-11-2019, 03:36 PM
  #4  
Member
Thread Starter
 
Join Date: Apr 2015
Location: Lhasa, Tibet
Posts: 166
Year: 1997
Model: Cherokee
Engine: 4.0 inline 6
Default

OK, thanks... I'll check out the link. Electrical stuff is still largely a mystery to me.
mtyson is offline  
Old 02-11-2019, 05:31 PM
  #5  
awg
Seasoned Member
 
Join Date: Mar 2016
Posts: 346
Year: 96
Model: Cherokee (XJ)
Engine: 4.0
Default

Originally Posted by mtyson View Post
OK, thanks... I'll check out the link. Electrical stuff is still largely a mystery to me.
double check the resistor terminal connections for corrosion, that is what caused my fan to stop working

fans wont pull more current unless they are absolutely worn out, which will be indicated by a grinding or rattling sound upon start up
awg is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Iamj6g
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
10
02-23-2017 09:00 PM
jeepgirl58
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
1
11-14-2012 06:16 PM
hedbutter
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
5
08-08-2012 09:42 PM
Bluemax
Off-Topic Discussion
38
02-04-2011 04:05 PM
woodnut_jeep
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
0
10-13-2010 10:25 PM

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

Thread Tools
Search this Thread
Quick Reply: Why are my shift solenoids and blower resistor getting fried?


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: