air cond dead - JeepForum.com
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post #1 of 17 Old 04-07-2020, 02:32 PM Thread Starter
2oldjeeps
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air cond dead

added freon like last year. it went to 38 in a few minutes. compressor dont cycle,on always.
gauge reads in blue dont move as it did last year.
but it hit 38 with outside at 72.
it would cycle with compressor but not now...?


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post #2 of 17 Old 04-07-2020, 02:57 PM
jtec
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DETAILS - system does not use FREON, it uses SUVA R134a.

You added last year, did you repair any leak? If not, I would suspect it is low again.

The low pressure (static) needs to be above @38psi. Pressure is temperature related. Might explain why it always wont start cycling.

A code could prevent PCM from commanding AC on, IIRC a temp or fan issue, limp mode, charging etc.

You could jump the AC low pressure switch and add refrigerant as you look at HIGH and low pressure gauge. USE R134a with DYE to help locate any leaks - do not use sealant or a stop leak added to refrigerant.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 17 Old 04-07-2020, 06:13 PM Thread Starter
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"The low pressure (static) needs to be above @38psi."


what is static?


i have just the meter that came with cheap kit.
used for years on 4 cars.

this the first time it doesnt cycle yet the temp at 38 is same as last year. good.
the comp dont release like it did b4. on all the time since i added "juice".
i know what to use, the only thing they sell at wally...


last yr i added in may and it worked till nov...



i didnt add much,just enuf to get the comp to engage.
do you think it needs more?

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
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post #4 of 17 Old 04-08-2020, 01:11 AM
jtec
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static is the condition when both sides equalize, system has been inoperative, it sat with the compressor is OFF.

"the temp at 38 is same as last year. confusing" - 38 is PSI not temp correct.

AC not cycling -is it cooling? Ideally we need to see both high and low readings. Did you jump the low pressure switch?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #5 of 17 Old 04-08-2020, 04:17 PM Thread Starter
2oldjeeps
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the temp at 38 is same as last year.


The temperature at 38 degrees is the same as it was last year after i charged it...and it worked that way till november.
ambient was 72 outside the car...



it doesnt cycle...cant get high/low readings because it does not cycle...ex; comp stays engaged, like always on/ running...
i really dont know any other way to describe the situation...anybody??

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00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
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post #6 of 17 Old 04-08-2020, 04:27 PM
TheBoogieman
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Bad leak not holding R134a.

Quote:
Originally Posted by jeepinmichguy_ View Post
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post #7 of 17 Old 04-08-2020, 04:27 PM
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Sounds to me like there's a leak somewhere. An A/C unit doesn't typically lose all of its refrigerant between seasons unless there's a leak. Yes they lose a little over long periods of time (usually over several years) as seals wear out over time. Best thing to do is vacuum the system down, then inject some refrigeration dye and charge the system and let it run for a while, after a few weeks you should be able to take a UV light and find the leak(s). Don't just use those little refill cans, you really need manifold gauges of course and a vacuum pump to really do the job properly. If there's a leak that means the system has sucked in contaminants such as air, debris, and moisture...so the system needs to be vacuumed down and really should be taken apart and all the parts flushed out but for the sake of figuring out what's wrong is to just vacuum the system down like previously mentioned so you can refrigerant and dye and find the leak(s).
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post #8 of 17 Old 04-08-2020, 06:39 PM
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At 72 degrees outdoor temp I don’t necessarily see a problem with a 38 psi suction pressure. Your losing me on it cycling. Normally I would like to see a compressor stay running, not constantly turning on and off. Auto a/c isn’t my specialty but when I charge one of our vehicles I like to use this . You set the little red arrow on the outdoor temperature and it gives you a temperature range which should get you close enough
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post #9 of 17 Old 04-08-2020, 07:07 PM
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I meant pressure range. Don’t know how to edit
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post #10 of 17 Old 04-08-2020, 08:04 PM
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He said the compressor is engaged, if it was low would it not run and stop continuously ?

You also should never have to add refrigerant to it if you do there is a leak, after 15 years I pulled 27 ounces out of mine.
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post #11 of 17 Old 04-08-2020, 08:45 PM
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It sounded like he was complaining it was running all the time. Yes, ideally I would like a leak free system. Mine has a leak in the evaporator coil. I was able to slow it down with a sealer. I have no intention of ripping out my dash unless the leak gets worse or the heater core goes bad. If I have to blow $6 on a can of refrigerant once a year, I’ll go that route! You weighed out your charge?
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post #12 of 17 Old 04-08-2020, 08:58 PM
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Quote:
Originally Posted by Spyder62 View Post
It sounded like he was complaining it was running all the time. Yes, ideally I would like a leak free system. Mine has a leak in the evaporator coil. I was able to slow it down with a sealer. I have no intention of ripping out my dash unless the leak gets worse or the heater core goes bad. If I have to blow $6 on a can of refrigerant once a year, Iíll go that route! You weighed out your charge?
My dad was able to yeah
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post #13 of 17 Old 04-08-2020, 09:05 PM Thread Starter
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first let me try once more.
the temperature of the air coming out of the ducts was 38 degrees, VERY COLD., DEGREES NOT PRESSURE OK...
next , i am used to a good working system cycling on /off in my hummer. when i start it , its COLD, RIGHT NOW, but it cycles. does it need juice?(134)

so i compare with that ,right or wrong. and yes im fine spending 5 bucks a year if thats what it takes.
so should the comp run forever while im driving???
seems like it would pump up whats neede4d then relax !! ?
most cars ive seen do that? right ? wrong...?

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00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
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post #14 of 17 Old 04-08-2020, 10:45 PM
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im pretty sure the compressor will constantly run if you're using the ac, if its low on R-134a it will cycle on and off as it tries to pump the r-134a. thats what my last jeep did when the ac went out.
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post #15 of 17 Old 04-09-2020, 08:34 AM
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This TOTALLY has to do with outside air temps and the load that is placed on the A/C at any given time. If it is 100 degrees out, your compressor will stay "locked in" for a greater period of time than if its 40 degrees out. The system is designed to kick out at a set temp so that the evaporator doesnt freeze up. If the temp outside is low, the compressor will cycle quickly because the system reaches that cutout temp at a fast pace. If the system is low on Freon, it will also cycle quickly because it is losing pressure in the system(basically the compressor is running out of available freon to pump) and the system kicks out the compressor to keep from damaging it. The trick here is knowing WHICH problem you have. This would be easier to determine if you had a full set of gauges to go off of. But we can determine from your vent temps that you should be pretty close to full(because you are getting 38 degree air out- the system cant get much colder than that. Remember freezing happens at 32 degrees). The way you are trying to service this is good guessing at best. The only way to know for sure if you are completely full, is to wait until you have 100 degree weather and see if you still get good temps out of the vents. If you are low on freon, it wont cool properly. If you are full, it still will cool your jets like you want. If you need to know now, for sure, then have a shop suck out the current freon amount and weigh it. Then compare it to the capacity and you will know how much, if any to add. If its full at that point, then sit back and enjoy the nearly freezing temps you have available to you already. 38 degrees is pretty damn good in my world...

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