AC comprerssor question ? - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WJ

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 06-08-2015, 12:12 PM
Member
My Jeep: 2004 2.8L WJ
 
Join Date: Nov 2011
Location: England UK
Posts: 104
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 2007
GCUK is on a distinguished road
AC comprerssor question ?

Hi guys,
My AC system is not performing at its best. It struggles to deliver 10oC to 11oC at the vents on a warm summer day.
I had a AC mobile guy come around to check it over. He said the system was a normal refrigerant level, with no signs of leaks with his UV light.
He went ahead and vacuumed out the old gas and put in new. At this point he said it was taking a long time to refill with new gas, and perhaps the compressor was getting a little "tired" as he called it (worn out he meant !)
After all this the air temp was still only 10oC. I then did the AC system reset and it did drop momentarily to around 7oC for a second or two then back to 10oC, then back to 7 oC and up to 10 oC in cycles. It did this for the first day but now seems to have settled back to just 10oC to 11oC

Do this sound like a worn compressor, does the long time to refill with new gas mean anything ? Can the engagement mechanism's slip or something ?
Its funny I got 7oC for just short period after the refill and system reset

Any suggestions appreciated

Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 06-08-2015, 12:39 PM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 7,328
Thanks: 17
Thanked 377 Times in 364 Posts
Rep Power: 529490
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: AC comprerssor question ?

I presume that the guy filled the system with the proper amount of lubricating fluid after doing the vacuuming? The problem could be related to not completely closing blend doors. You could try a AC calibration, to be sure the full open and full closed stops are reached. Not sure what the slow filling could be pointing to. Would not suspect the AC compressor at this moment. You can check the function of the compressor clutch just by looking at it. You will see the outher pulley rotate constandly, driven by the belt, and the center part will start rotating when the clutch solenoid is activated. You will see it cycling more or less 20 secs on, 20 secs off. A too rapidly cycling compressor clutch could mean a too low charge, or a not well functioning high pressure switch.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #3  
Old 06-08-2015, 05:40 PM
Member
My Jeep: 2004 2.8L WJ
 
Join Date: Nov 2011
Location: England UK
Posts: 104
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 2007
GCUK is on a distinguished road
Re: AC comprerssor question ?

Thanks for the info.
As I mentioned I did do a AC recalibration and it did work better for a short while. So perhaps the blend doors aint closing properly ? I fitted new doors a couple if years ago, maybe need to drop the glove box and watch them move up and down !!
Reply With Quote
  #4  
Old 06-08-2015, 09:53 PM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 7,328
Thanks: 17
Thanked 377 Times in 364 Posts
Rep Power: 529490
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: AC comprerssor question ?

Quote:
Originally Posted by GCUK View Post
Thanks for the info.
As I mentioned I did do a AC recalibration and it did work better for a short while. So perhaps the blend doors aint closing properly ? I fitted new doors a couple if years ago, maybe need to drop the glove box and watch them move up and down !!
You didn´t mention the re-calibration in this post, you only said you did a reset. If the problem has to do with the blend doors not closing properly, then you should get cold air after the first engine start and with cold coolant. So if you then also don´t get cold air, then the problem should not be with the blend doors.
You can move the blend doors one by one by using the current parameter mode. You access this mode while you are in the test mode, by turning the left temperature selector knob clockwise or counter clockwise. The left display will show the pointer number, which shows which component it will be accessing. You will need pointer 32 for the left blend door actuator, and pointer 42 for the right blend door actuator. When in pointer 32 (for driver side) or 42 (for passengers side), rotating the right temperature selector knob will manually control the respective blend door. You can see if then the required temperature can be reached.
If still not, then there should be some other problem.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
The Following User Says Thank You to Frango100 For This Useful Post:
  #5  
Old 06-09-2015, 08:16 AM
Member
My Jeep: 2004 2.8L WJ
 
Join Date: Nov 2011
Location: England UK
Posts: 104
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 2007
GCUK is on a distinguished road
Re: AC comprerssor question ?

Sorry, reset/recalibration meant the same thing in my mind at the time.
I'm gonna follow your advice and check out those blend doors if the AC blows nice and cold on start up before the engine temp rises.
Reply With Quote
  #6  
Old 06-10-2015, 08:41 AM
Member
My Jeep: 2004 2.8L WJ
 
Join Date: Nov 2011
Location: England UK
Posts: 104
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 2007
GCUK is on a distinguished road
Re: AC comprerssor question ?

Good news is on a cold engine I'm getting air vent temperatures down to 4.5oC on start up as the compressor cuts in and out on a 7 seconds in / 15 seconds out cycle.
Off course after a few minutes of Idle on a mild day the engine temperature doesn't take long to start warming up, and after 5 mins I'm only getting 11oC at the vent with the compressor running for longer cycles, and warm air if I ask for heat.
So therefore it seems to point to the blend doors not fully closing ? That is where I will look next

Thanks
Reply With Quote
Reply

Thread Tools
Display Modes

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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Trailer Question & 730N Question oz1302 Grand Cherokee - WK2 - 3 11-22-2011 02:44 AM
stereo question, subs question, please help! jeepinhard Audio, Video, Navigation & Electronic Modifications 14 04-13-2011 08:00 AM
Rim question / tinted tail light question burt0n05 Grand Cherokee - WK 12 02-08-2010 12:36 PM
NO question is a stupid question! So ask away! Scottina06 Site News, Help, and Feedback 10 06-15-2009 07:51 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 01:23 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.