Go Back   Jeep Garage - Jeep Forum > Jeep Technical Discussion > Troubleshooting/Problems Discussion

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 07-08-2014, 10:49 AM
Member
My Jeep: 2004 4.7 HO WJ
 
Join Date: Jun 2014
Posts: 17
Thanks: 11
Thanked 0 Times in 0 Posts
Rep Power: 50
jironman is on a distinguished road
A/C working intermittently

Hi guys,

I've been having issues with my A/C lately. I definitely would like to avoid the dealership.

First it appeared the A/C wasn't blowing as cold as it did prior. The blower seems to work fine although then side vents don't have the same force.

So I bought an A/C repair kit (basically a hose w/gauge and coolant). It was in need of a charge so I followed the instructions. (Side note: everything seemed to be engaging when I turn on the a/c).

For about two days all appeared to be working. Then it started having issues again. It would work off and on... blow cold for a bit then room temp air. No real pattern just cold then fade to warm then cool again. While out running errands I noticed it would blow cool after turning off the vehicle. ???

Currently it appears to only blow room temp.

Any ideas? Leak? If so, any common areas to look? Tips?

Any help would be greatly appreciated.

Thanks,

Jamie
__________________

__________________
Reply With Quote
  #2  
Old 07-08-2014, 03:10 PM
sanjuro77's Avatar
Member
My Jeep: 1996 4.0L ZJ
 
Join Date: Dec 2013
Location: NE Ohio
Posts: 116
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 342
sanjuro77 is on a distinguished road
You can get AC refrigerant that has an ultraviolet dye in it to find the leaks, it usually comes with a little UV pen light.

The intermittent part happens as your system loses pressure. When it's low, the compressor will cut on and off to avoid damage to the system. When it's empty or close to empty, the compressor won't come on at all.

Sometimes if the system is empty or hasn't been running for a while, the o rings can dry out. You may be lucky enough to just have to add another can or two of refrigerant and run the ac for a while to get them lubed up (if there aren't any other leaks, of course).

I had an old truck I had to do that with, put three cans through it before it actually stopped leaking, but after that I didn't have to fill it again for 3 years!
__________________

__________________
Reply With Quote
The Following User Says Thank You to sanjuro77 For This Useful Post:
  #3  
Old 07-08-2014, 03:37 PM
Premium Member
My Jeep: 2014 5.7L WK2
 
Join Date: May 2013
Location: Colorado
Posts: 2,023
Thanks: 18
Thanked 54 Times in 48 Posts
Rep Power: 43410
lstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond repute
Re: A/C working intermittently

Quote:
Originally Posted by jironman View Post
Hi guys,

I've been having issues with my A/C lately. I definitely would like to avoid the dealership.

First it appeared the A/C wasn't blowing as cold as it did prior. The blower seems to work fine although then side vents don't have the same force.

So I bought an A/C repair kit (basically a hose w/gauge and coolant). It was in need of a charge so I followed the instructions. (Side note: everything seemed to be engaging when I turn on the a/c).

For about two days all appeared to be working. Then it started having issues again. It would work off and on... blow cold for a bit then room temp air. No real pattern just cold then fade to warm then cool again. While out running errands I noticed it would blow cool after turning off the vehicle. ???

Currently it appears to only blow room temp.

Any ideas? Leak? If so, any common areas to look? Tips?

Any help would be greatly appreciated.

Thanks,

Jamie
Rather than a simple charge can and guage, you might want to pick up an A/C manifold guage and hose set if you plan to maintain this yourself.
A set of gloves and eye protector are a good idea...

You can get a reasonable one for about 90 bucks, e.g. the Interdynamics Manifold Guage and Hose Set from Advance Auto comes in a nice carry/store case compared to the similarly priced Autozone units.

I suspect your charge barely lifted it above minimum, then as it leaked [possibly too rapidly] your compressor will start cycling on and off to try to avoid damage.

Unless you evacuate the system [which requires more $$$] you usually don't need oil/freon mix, but if you need more than one can, adding a single can to a fairly depleted system should work.

Before you start, carefully clean EVERY A/C hose and bit of hardware, using a scrub brush and bit of tide or similar soap. Rinse thoroughly and rinse again.

A fairly significant leak will usually leave the lubricant behind and leave greasy places on hoses, couplings, or those !@!!$@ Schrade valves. Definitely pick up dye as well, plus a small UV lamp.

Then, use a manifold to charge it up, let it run for several minutes and check to make sure on recirc/full blast/full cool, the outlet temperature is close to 40 F.

Shut it off, and check the pressures again after an overnight sit, to see if you have a bad leak.

If not, drive it for a while, but watch out for any sign of cooling failures and put the manifold set on it again and check pressures.

Hoses, compressor, schrade valves, condensor, evaporator, are all suspects. If you have to open it up, I suggest having it fully pressure tested and use an electronic sniffer for leaks, and find a good independent A/C shop who is willing to tell you which leaks really need to be repaired and which are rather expensive for only a small benefit.
__________________
Reply With Quote
The Following User Says Thank You to lstowell For This Useful Post:
  #4  
Old 07-09-2014, 11:56 AM
Member
My Jeep: 2004 4.7 HO WJ
 
Join Date: Jun 2014
Posts: 17
Thanks: 11
Thanked 0 Times in 0 Posts
Rep Power: 50
jironman is on a distinguished road
Re: A/C working intermittently

Thanks for the tips guys. I'll get on it and let everyone know how it turns out. Thanks again.

Jamie
__________________
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
08 Hemi idle drops too low intermittently & stalls bet_on_black Troubleshooting/Problems 6 10-30-2012 09:43 PM
Tail lights intermittently working psycojeep Troubleshooting/Problems 2 09-07-2012 03:00 PM
Power Window (Fronts) issue goes down by itself intermittently rdlarado10 Troubleshooting/Problems 11 07-13-2012 07:23 AM
Right Fog Lamp Intermittently Decides to Work raider91e Trouble Shooting/Problems/Service 5 02-18-2012 08:47 AM
Radio intermittently uses only one speaker JujuB Trouble Shooting/Problems/Service 3 06-01-2011 10:05 AM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 10:10 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community