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96 jeep grand, A/C comp. will NOT cycle off please help
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generalleexj
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Mar 30, 2012, 4:01 PM
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96 jeep grand, A/C comp. will NOT cycle off please help
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okay, well ill start with specs
1996 grand cherokee limited 5.2 ( rebuild engine ) ive put about 10,000 miles on it so far, everythings great
my a/c has NEVER blown cold for more than 2 weeks in my jeep for the past 3 years , so i figured id finally tackle this feat.
so i ordered the liquid line ( which has the orifice tube in it, only way to change it,)
i also ordered the accumulator, and both high and low pressure switches.
now when i put the new accumulator in, i added 4 oz oil directly into the accumulator,( which is what it calls for ) i then took the compressor off and spun the clutch and pushed out all the oil,(about 1 oz) i then added about 1 oz of oil to the compressor itself. now i did a deep vaccuum for 20 mins, no leaks at all, checked out great.
then i charged 28oz of freon to the system, just like the decal said.
my problem is the a/c will NOT cycle off. it just stays on constantly, im getting very cold temps inside which is great, but i know the compressor is supposed to cycle off and on.
my HIGH side pressure is at 350 !!! and the lowside is right under 50.
the high side pressure is too high, the temperature outside today was 60 degrees.
my only thought is that theres too much oil in the system from the 3 years, of adding dye here and there. could this cause my symptoms ? the machine did not pull out any oil, and i actually cut the old accumulator open and there was no residual oil in there, just the dessicant was slightly saturated and thats it,
i recovered the freon, and started over adding only 10 oz. and the clutch would cycle on and off normally while charging, does this also suggest over charging due to too much oil ? im kind of stuck ,
my only other option is to take the system apart again and flush out
each individual component, which im not against, just not sure why
this is happening, any thoughts would be great, thanks for reading guys
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Hammer Time
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Mar 30, 2012, 5:19 PM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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You have one of 3 things wrong. Either the fan is not pulling enough air across the condenser, the condenser is partially clogged ( which I believe is the cause) and not doing it's job or the system is overcharged which i doubt.
While you have the pressure gauges attached, mist the condenser with the water hose and see if both pressures drop substantially.
You don't have too much oil and in fact I would have put more in the compressor.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Mar 30, 2012, 5:21 PM)
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Tom Greenleaf
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Mar 30, 2012, 6:27 PM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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Zackery!
High side too high with know correct charge? It isn't exchanging heat at condenser for whatever reason be that air flow, choked with dirt or bugs or some crazy issue to be found but 350 is way too high unless it's about 150F out!
Not common where I live but make sure there are not tons of leaves or whatever in between condenser and radiator. Surprised HPCO (high pressure cut out) isn't shutting this down?
Low chance maybe is that clutch is frozen for some reason ON and if so would stay engaged if unplugged right at it. If that stays on got to find out why or all hell will break loose,
Tom
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Hammer Time
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Mar 30, 2012, 6:30 PM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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The pressures are what's keeping the clutch engaged. I think cutoff on this one is about 22PSI and it's never seeing that.
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Tom Greenleaf
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Mar 30, 2012, 7:09 PM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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Right on. Why is yet to be found out. I've only seen this to a limit with a strong overcharge which doesn't seem to be the case here,
Tom
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Hammer Time
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Mar 30, 2012, 7:12 PM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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No, this is a lack of condensation issue. We'll find out if he ever returns and performs the test I suggested.
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Tom Greenleaf
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Mar 30, 2012, 7:24 PM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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That happens here rarely with a "mud wasp" that can and will clog up where condesate drains usually out that little elbow. Usually makes a wet floor though??
Tom
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Hammer Time
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Mar 30, 2012, 7:27 PM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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I'm not talking about an evaporator. I'm talking about a condenser that condenses..........or not.
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generalleexj
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Mar 30, 2012, 7:49 PM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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when you say the condenser is partially clogged, you mean on in the inside right ? , so i should FLUSH the condenser with the flush tool and shop air correct ? , i actually took the accumulator off earlier and opened the shrader valve and dumped all the oil out of it, thinking it was over full, so should i re add oil to the accumulator ? another 4 ounces, or maybe just 3 since the desicant bag is probably saturated.
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generalleexj
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Mar 30, 2012, 7:55 PM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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or should i just replace the condenser ?
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Tom Greenleaf
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Mar 30, 2012, 8:24 PM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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My mistake back a few. Diagnose the problem which could be a condenser but we will need more to condemn it.
Condenser is the radiator if you will for the A/C. Evaporator is just that - the place refrigerant evaporates which technically is taking away heat not cooling but we all understand that bull,
Tom
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Hammer Time
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Mar 31, 2012, 3:08 AM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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Now you're starting to get all screwed up. Leave the oil alone. Before we knew how much oil was in it. Now we don't. As i said earlier, you need to see how the fan is working before looking any further. You can't flush these condensers as they as "bypass type" and cannot be flushed. If you determine the fan is pulling sufficient air and you perform the test I asked you to in the first place, then replace the condenser.
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generalleexj
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Mar 31, 2012, 4:38 AM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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The fan is meachanical and the clutch is 6 months old I just replaced it
I will try pouring water over the condenser . But I suspect the condenser is bad bc the fan blows strong and all other parts are new
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Hammer Time
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Mar 31, 2012, 4:46 AM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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That's probably correct. see what the pressures do when the condenser is cooled with water.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Mar 31, 2012, 4:47 AM)
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generalleexj
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Mar 31, 2012, 5:16 AM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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Okay thankyou ! Going out back right now to test. Brb
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generalleexj
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Mar 31, 2012, 5:50 AM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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While running the liquid line that goes from the evap to the condenser which also has the orifice tube in it (the one I replaced brand New yesterday) frosts white while a/c running. I then poured 1 gallon of water over the entire condenser and the pressure went from around 340 to about 310. Like I said the mech. Fan blows very strong clutch is still new. I just really don't wanna drip another 100 on the condenser unless I know its bad. Any suggestions ?
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Hammer Time
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Mar 31, 2012, 5:54 AM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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Yeah, take it to an A/C shop if you want guarantees.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
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Mar 31, 2012, 5:57 AM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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Frost on liquid line! If that starts at one point there's probably a restriction there,
T
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generalleexj
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Mar 31, 2012, 6:04 AM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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Okay last thing then. The ac does not drip water under the body like it should either. The vent is NOT clogged I checked. So if the freezing line is right between the evap and condenser and its a NEW line. So with all that being said. The only two possibilites it could be are the condenser or the evaporator. I'm thinking about just taking the condenser out and trying to blow air through it and see if it comes out freely. I'm out of options. I'll just leave it al that.
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Hammer Time
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Mar 31, 2012, 6:07 AM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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You know, you're not listening to anything you are being told and I'm about finished here. I already told you that a bypass type condenser cannot be flushed.
Of course you have a restriction in the liquid line. The orifice is in there.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
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Mar 31, 2012, 6:13 AM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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That line may be defective or those with O tubes may have wrong one or all plugged up.
No condensate is not surprising if it isn't blowing cold air at you inside. You should probably be using an infrared thermo as temps will tell you the pressures and where,
T
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Discretesignals
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Apr 1, 2012, 12:11 PM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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Pouring cold water on the condenser should of dropped the high side down like a lead weight if there was an air flow problem. I've seen restrictions in the condenser cause cold/ice spots on the condenser itself before, so you might want to check for that.
I'm starting to wonder, like Tom, if that orifice line that was installed is the problem. You still have the old line? You could install the old line and see if your problem changes or goes away. Usually if an orifice is completely clogged you'll have low high side and near zero low side pressure. Compressor can't pump refrigerant if there is no refrigerant getting to it.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Apr 1, 2012, 12:24 PM)
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Hammer Time
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Apr 1, 2012, 2:25 PM
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Re: 96 jeep grand, A/C comp. will NOT cycle off please help
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I have gotten rid of your other thread and if you do that again I'll get rid of this one. You were told long ago that you have an issue with the condenser or air flow across it and you're just ignoring that. I don't think you have any issue at all with the liquid line because it's perfectly normal for the point right after the tube to be the coldest point. If the tube was restricted, you wouldn't have the high suction pressure that you do. You were advised to wet the condenser and see what happens to the pressures and as yet all you have done is keep suggesting other things. If you want a guaranteed accurate diagnosis, then pay an A/C specialist to diagnose the car in person where he gets to examine it.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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