My 98 4.0s ac compressor cycles quite often - JeepForum.com
 
LinkBack Thread Tools
post #1 of 9 Old 07-06-2020, 11:09 PM Thread Starter
8v-of-fury
Registered User
1998 ZJ 
 
Join Date: Nov 2015
Location: Orillia
Posts: 524
My 98 4.0s ac compressor cycles quite often

Could that be related to a pressure switch saying yay or nay to the system?

Are these compressors variable (no clutch actuation whilst operating)

Or the cycle of the clutch every so often type?


'98 ZJ 4.0/242, Locked d30/d35, 31x10.5x15, 2" BB w/ Bilstein 5100's
8v-of-fury is offline  
Sponsored Links
Advertisement
 
post #2 of 9 Old 07-07-2020, 02:37 AM
Zilliver
Registered User
1998 ZJ 
 
Join Date: Sep 2015
Location: Vantaa <-> Tallinn
Posts: 635
Seems the system is a bit low on freon.

98 Grand Cherokee 5.9 - daily
95 Grand Cherokee 5.2 - offroad
Zilliver is offline  
post #3 of 9 Old 07-07-2020, 08:10 AM
LordHobbit
Registered User
 
LordHobbit's Avatar
1993 ZJ 
 
Join Date: Aug 2009
Location: Utah
Posts: 2,617
Yep, refrigerant is low. If you don't have the tools, take it to a competent shop to check out the system, full vacuum and recharge.

Or if you don't care for it to be checked out for leaks, one of those refill cans can help for the season.

93 red ZJ 196k 4.0. Spent more money than I should have ...
LordHobbit is offline  
 
post #4 of 9 Old 07-07-2020, 06:57 PM Thread Starter
8v-of-fury
Registered User
1998 ZJ 
 
Join Date: Nov 2015
Location: Orillia
Posts: 524
I am sure I checked it out previously with the gauges and the pressures were fine.

But as I have just learnt on my volkswagen, the compressor has a controlled valve that steadies the pressures pretty much always.

At about 90f, I am seeing i want like a low of 45-50psi and

'98 ZJ 4.0/242, Locked d30/d35, 31x10.5x15, 2" BB w/ Bilstein 5100's
8v-of-fury is offline  
post #5 of 9 Old 07-07-2020, 06:58 PM Thread Starter
8v-of-fury
Registered User
1998 ZJ 
 
Join Date: Nov 2015
Location: Orillia
Posts: 524
A high side of 150-200 area.

Sorry. Stupid phone browser.. haha

'98 ZJ 4.0/242, Locked d30/d35, 31x10.5x15, 2" BB w/ Bilstein 5100's
8v-of-fury is offline  
post #6 of 9 Old 07-07-2020, 08:05 PM Thread Starter
8v-of-fury
Registered User
1998 ZJ 
 
Join Date: Nov 2015
Location: Orillia
Posts: 524
As I said earlier, I have checked the pressures in past years.. but because they were "okay" I didn't try adding any quickcool cans. However I did just have muchos luck on my Volkswagen.. It needed a compressor clutch coil, and then afterwards the AC would physically work, but not blow much more than 10* colder than ambient. I slowly added a can of the refrigerant while watching both low and high side gauges. And periodically feeling the vents.. Now it blows literal ice cold.. LOL



Perhaps I will try adding refrigerant to the Jeep to see if it does anything.

'98 ZJ 4.0/242, Locked d30/d35, 31x10.5x15, 2" BB w/ Bilstein 5100's
8v-of-fury is offline  
post #7 of 9 Old 07-07-2020, 08:06 PM Thread Starter
8v-of-fury
Registered User
1998 ZJ 
 
Join Date: Nov 2015
Location: Orillia
Posts: 524

'98 ZJ 4.0/242, Locked d30/d35, 31x10.5x15, 2" BB w/ Bilstein 5100's
8v-of-fury is offline  
post #8 of 9 Old 07-11-2020, 11:10 AM Thread Starter
8v-of-fury
Registered User
1998 ZJ 
 
Join Date: Nov 2015
Location: Orillia
Posts: 524
So I did have a half can of r134a equivalent sitting around, i added it slowly to the system. It made quite the difference in the coolness of the system.

Are these compressors internally regulated by way of a TXV? or are they the type to cycle on and off?

'98 ZJ 4.0/242, Locked d30/d35, 31x10.5x15, 2" BB w/ Bilstein 5100's
8v-of-fury is offline  
post #9 of 9 Old 07-11-2020, 08:14 PM
jeepjeepster
Registered User
 
Join Date: Dec 2004
Posts: 3,721
Nope, just on and off...

WJ's got the expansion valve.

1994 ZJ-I6 w/270,000 mi
1998 ZJ 5.9 w/66,000 mi Slate Black
2004 KJ w/108,000 mi
jeepjeepster is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com 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 e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 Off
Pingbacks are On
Refbacks are On

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