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AC Issues - 2007 Chrysler Pacifica #5137023
06/17/19 08:33 PM
06/17/19 08:33 PM
Joined: Mar 2004
Posts: 1,775
Flaherty, KY
92saturnsl2 Offline OP
92saturnsl2  Offline OP

Joined: Mar 2004
Posts: 1,775
Flaherty, KY
I have a 2007 Chrysler Pacifica that I'm having AC issues with. I bought the car last year and pointed out to the dealer that the AC wasn't working. He added some refrigerant & dye so I could see if the compressor would kick on and that the system itself was working, hopefully indicating that it's a leak and not anything major. The compressor did kick on right away and it blew cold air for a week or two.

I took it to a trusted independent mechanic a couple weeks ago to have them determine what is wrong, and they replaced the condenser which had a substantial leak. I assume they topped up the refrigerant, he told me they added dye, ran it for 45 minutes or so to test for any other leaks, everything looked good so they sent me on my way.

Yesterday was the first good hot day I could really put it to the test, and it's blowing out what I would consider "cool" air (definitely cooler than ambient temp), but far from cold. In 80+ degree temps it fails miserably at keeping the interior a comfortable temperature.

I checked the compressor with the vehicle running and it is cycling on and off repeatedly. About 5-10 seconds on, 5-10 seconds off, does this constantly. I have a DIY gauge for the low pressure side, so I plugged that in to see if perhaps it was low on refrigerant, and the gauge reads right where it should. The "filled/green" part of the gauge spans 25-45 PSI, and I'm getting approx 40 PSI when the compressor is running. When the compressor kicks off, the gauge goes higher to about 55 PSI which is in the yellow/warning area of the gauge. When the compressor kicks back on, it goes back to 40 PSI. Don't know enough about AC to discern whether the gauge going up and down with the compressor cycling is appropriate behavior.. But I do know that the compressor should not cycle on and off like this.

Anyone have any idea what might cause this? Would like to at least have a sense of what might be wrong before I bring it back to the mechanic and drain my wallet further. Any help or insight would be appreciated!


1985 F-250HD 7.5L 4x4 135k- Castrol GTX 15w-40
04 Odyssey EX 190k Valv. Durablend 5w-30
96 Maxima GLE 265k Chevron Delo LE 5w-40
07 Chrysler Pacifica Limited 4.0L 140k Belgian Castrol Edge 0w-30 Euro
Re: AC Issues - 2007 Chrysler Pacifica [Re: 92saturnsl2] #5137033
06/17/19 08:39 PM
06/17/19 08:39 PM
Joined: Jun 2003
Posts: 19,178
Apple Valley, California
Chris142 Online content
Chris142  Online Content

Joined: Jun 2003
Posts: 19,178
Apple Valley, California
No idea without a high side reading.


02 Wrangler traveler sae30
87 F250 Valvoline 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor Chevron sae30
Re: AC Issues - 2007 Chrysler Pacifica [Re: 92saturnsl2] #5137036
06/17/19 08:41 PM
06/17/19 08:41 PM
Joined: Apr 2013
Posts: 236
Kevil,Ky
vwmaniaman Offline
vwmaniaman  Offline

Joined: Apr 2013
Posts: 236
Kevil,Ky
sounds like it may be overcharged.


Don't waste your time on a slipshod repair.
Re: AC Issues - 2007 Chrysler Pacifica [Re: Chris142] #5137057
06/17/19 09:20 PM
06/17/19 09:20 PM
Joined: May 2019
Posts: 241
USA
AC1DD Offline
AC1DD  Offline

Joined: May 2019
Posts: 241
USA
Originally Posted by Chris142
No idea without a high side reading.


Yes, you NEED proper gauges to troubleshoot, you can get some cheap but effective real gauges from Harbor Freight. Come back with readings.

I will guess and say that either it is over charged with R-134a OR the shop added too much oil! Something that is often missed in diagnosis.
Lots of incompetent shops out there, the rare one is competent!

Re: AC Issues - 2007 Chrysler Pacifica [Re: 92saturnsl2] #5137079
06/17/19 09:44 PM
06/17/19 09:44 PM
Joined: Mar 2004
Posts: 1,775
Flaherty, KY
92saturnsl2 Offline OP
92saturnsl2  Offline OP

Joined: Mar 2004
Posts: 1,775
Flaherty, KY
I will pick up a set of good gauges. Do I do the same on the high side--- i.e turn air on max, plug in gauge and take reading? Or is there a more elaborate procedure? Learning here, be easy on me! I can repair pretty much anything on a vehicle but AC I haven't done much with.


1985 F-250HD 7.5L 4x4 135k- Castrol GTX 15w-40
04 Odyssey EX 190k Valv. Durablend 5w-30
96 Maxima GLE 265k Chevron Delo LE 5w-40
07 Chrysler Pacifica Limited 4.0L 140k Belgian Castrol Edge 0w-30 Euro
Re: AC Issues - 2007 Chrysler Pacifica [Re: 92saturnsl2] #5137094
06/17/19 10:09 PM
06/17/19 10:09 PM
Joined: Jul 2013
Posts: 570
D/FW Metroplex
The_Nuke Offline
The_Nuke  Offline

Joined: Jul 2013
Posts: 570
D/FW Metroplex
That constant cycling of the compressor is common behavior, if not normal as well, for the Mopars I’ve owned recently. If it’s an indication of something wrong, I’ve got the same problem to deal with on mine.

Going just off your post’s info, and in the absence of more info from the folks that touched it, I would say the system has too much refrigerant in it. That can manifest itself in different ways, but one way a slightly overfilled system (as opposed to grossly overfilled) will behave is to blow cold air most of the time, but then only blow cool or even warm air when you really need it most.

I had this situation on my last Challenger. It was fine until temps outside got above 80 and vehicle forward movement was little or none, like in stop and go traffic. At those times, it would just blow outside air inside the car, so no cooling at all really.

The system turned out to be overfilled with Freon, and removing the excess amount fixed the behavior it was exhibiting previously in the adverse conditions. The high side pressure rating was the final data point that verified my suspicions, but I obtained it via the relevant PID in the WOT datalogs I was generating with my DS tuner. You wont have that luxury it sounds like, so you’ll need the gauges.

As for the proper procedure to use when obtaining that high side pressure on the gauges, I do not have it, sorry. Hopefully someone can provide it here. (It May be as simple as hook up gauges, turn on a/c, read red guage’s psi; but it may be more involved too, best to wait for others to chime in).

Good luck with it,
Nuke


2012 Charger Pursuit aka "The Bacon Hauler"
- 5.7L + NAG1 (A5) + 2.65 (215mm)
Re: AC Issues - 2007 Chrysler Pacifica [Re: 92saturnsl2] #5137130
06/17/19 11:00 PM
06/17/19 11:00 PM
Joined: Jun 2003
Posts: 19,178
Apple Valley, California
Chris142 Online content
Chris142  Online Content

Joined: Jun 2003
Posts: 19,178
Apple Valley, California
Were the cooling fan (s) running?


02 Wrangler traveler sae30
87 F250 Valvoline 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor Chevron sae30
Re: AC Issues - 2007 Chrysler Pacifica [Re: Chris142] #5137197
06/18/19 04:00 AM
06/18/19 04:00 AM
Joined: Mar 2004
Posts: 1,775
Flaherty, KY
92saturnsl2 Offline OP
92saturnsl2  Offline OP

Joined: Mar 2004
Posts: 1,775
Flaherty, KY
Originally Posted by Chris142
Were the cooling fan (s) running?


Yes, the cooling fans are running at high speed as one would expect when the AC is on. They keep running even as the compressor cycles on and off.


1985 F-250HD 7.5L 4x4 135k- Castrol GTX 15w-40
04 Odyssey EX 190k Valv. Durablend 5w-30
96 Maxima GLE 265k Chevron Delo LE 5w-40
07 Chrysler Pacifica Limited 4.0L 140k Belgian Castrol Edge 0w-30 Euro
Re: AC Issues - 2007 Chrysler Pacifica [Re: Chris142] #5137219
06/18/19 05:15 AM
06/18/19 05:15 AM
Joined: Mar 2015
Posts: 6,436
Virginia
bbhero Offline
bbhero  Offline

Joined: Mar 2015
Posts: 6,436
Virginia
Originally Posted by Chris142
No idea without a high side reading.



True here ^^^^^^^

Based upon what has been presented... Like others have thought... It is overcharged.


Nissan Altima 3.5 Coupe
Carquest High mileage full synthetic 5w30
CQ blue 84356 Oil filter
"Treat your family like your friends and treat your friends like your family."
Re: AC Issues - 2007 Chrysler Pacifica [Re: 92saturnsl2] #5137736
06/18/19 05:41 PM
06/18/19 05:41 PM
Joined: Dec 2006
Posts: 1,076
midwest
JamesBond Offline
JamesBond  Offline

Joined: Dec 2006
Posts: 1,076
midwest
Are you taking this reading at idle speed? What is the reading at 2000 rpm?

Re: AC Issues - 2007 Chrysler Pacifica [Re: 92saturnsl2] #5137737
06/18/19 05:43 PM
06/18/19 05:43 PM
Joined: Mar 2004
Posts: 1,775
Flaherty, KY
92saturnsl2 Offline OP
92saturnsl2  Offline OP

Joined: Mar 2004
Posts: 1,775
Flaherty, KY
Bought the gauge kit from Harbor Freight. Previous LP reading I took was at idle. I'll read high and low @ 1500-2000rpm and report back.


1985 F-250HD 7.5L 4x4 135k- Castrol GTX 15w-40
04 Odyssey EX 190k Valv. Durablend 5w-30
96 Maxima GLE 265k Chevron Delo LE 5w-40
07 Chrysler Pacifica Limited 4.0L 140k Belgian Castrol Edge 0w-30 Euro
Re: AC Issues - 2007 Chrysler Pacifica [Re: 92saturnsl2] #5137837
06/18/19 07:50 PM
06/18/19 07:50 PM
Joined: Mar 2004
Posts: 1,775
Flaherty, KY
92saturnsl2 Offline OP
92saturnsl2  Offline OP

Joined: Mar 2004
Posts: 1,775
Flaherty, KY
Here's a video of the gauge readings after the AC had been running for 10 minutes or so. When I first kicked the AC on, the compressor ran steady for about 1-2 minutes, with low pressure around 40 and high around 300-350. After running a bit it began the compressor cycling which became quicker the longer the AC ran. The cycling will continue in perpetuity, the high pressure peaks, compressor kicks off, high pressure drops while low pressure rises, compressor kicks back on and repeat.

RPM was being held between 1500-2000rpm, with my wife in the driver's seat it's not all that steady, but I'm certain it didn't go above 2000 rpm or so.

video here

Hard to read the gauge increments after I compressed the video, the high pressure reads in 50PSI graduations, low pressure first black indication is 0, then 10 PSI increments. If this is a classic symptom of overcharging, how do I remove some of the refrigerant?


1985 F-250HD 7.5L 4x4 135k- Castrol GTX 15w-40
04 Odyssey EX 190k Valv. Durablend 5w-30
96 Maxima GLE 265k Chevron Delo LE 5w-40
07 Chrysler Pacifica Limited 4.0L 140k Belgian Castrol Edge 0w-30 Euro
Re: AC Issues - 2007 Chrysler Pacifica [Re: 92saturnsl2] #5137858
06/18/19 08:10 PM
06/18/19 08:10 PM
Joined: Sep 2015
Posts: 1,939
USA
mk378 Online content
mk378  Online Content

Joined: Sep 2015
Posts: 1,939
USA
Wow. It goes straight up to the high pressure cutoff at 450. That should not happen in normal operation. If the condenser fans were running the whole time, it's seriously overcharged with refrigerant and / or oil.

The only way to be sure of a correct charge of refrigerant is to remove it all (down to vacuum) then charge the specified amount by weight. Excess oil is harder to get out.

Re: AC Issues - 2007 Chrysler Pacifica [Re: mk378] #5137875
06/18/19 08:23 PM
06/18/19 08:23 PM
Joined: Mar 2004
Posts: 1,775
Flaherty, KY
92saturnsl2 Offline OP
92saturnsl2  Offline OP

Joined: Mar 2004
Posts: 1,775
Flaherty, KY
Originally Posted by mk378
Wow. It goes straight up to the high pressure cutoff at 450. That should not happen in normal operation. If the condenser fans were running the whole time, it's seriously overcharged with refrigerant and / or oil.

The only way to be sure of a correct charge of refrigerant is to remove it all (down to vacuum) then charge the specified amount by weight. Excess oil is harder to get out.


Is there anything else that can cause this? i.e bad dryer, accumulator, expansion valve or such? Perhaps blockage in the system? Or is this a surefire overcharge situation?


1985 F-250HD 7.5L 4x4 135k- Castrol GTX 15w-40
04 Odyssey EX 190k Valv. Durablend 5w-30
96 Maxima GLE 265k Chevron Delo LE 5w-40
07 Chrysler Pacifica Limited 4.0L 140k Belgian Castrol Edge 0w-30 Euro
Re: AC Issues - 2007 Chrysler Pacifica [Re: 92saturnsl2] #5137928
06/18/19 09:19 PM
06/18/19 09:19 PM
Joined: Sep 2015
Posts: 1,939
USA
mk378 Online content
mk378  Online Content

Joined: Sep 2015
Posts: 1,939
USA
You have to know the charge is correct before any other diagnosis can be made.

Generally if there is a blockage, no refrigerant can get to the low side and the pressure there goes down to near or below zero. Unless the blockage is in the condenser (and the high side port is before the condenser), the high side will stay reasonable or even low. No refrigerant flowing means that it all condenses in the condenser and receiver and then sits there.

Last edited by mk378; 06/18/19 09:22 PM.
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