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Old 07-30-2010, 08:41 PM   #1
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TJ Air Conditioning

Does anyone know the total capacity of R134a for a 2003 Wrangler with 4.0?I know it is posted on a decal on top of the radiator,but mine is messed up and halfway torn off.I have been trying to charge mine,am up to 2 cans of refrigerant,and the compressor is still cycling on and off.I know this is a sign of low refrigerant,but I don't want to overcharge it.Before I put a third can in,I would like to know how much factory specs state.Thanks!

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Old 08-02-2010, 09:24 PM   #2
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WOW!I am impressed!49 people viewed this post,yet zero replied!Way cool!

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Old 08-02-2010, 09:40 PM   #3
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Mine says .567 kg or 1.25 lbs
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Old 08-02-2010, 09:45 PM   #4
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Quote:
Originally Posted by GoldTJ View Post
Does anyone know the total capacity of R134a for a 2003 Wrangler with 4.0?I know it is posted on a decal on top of the radiator,but mine is messed up and halfway torn off.I have been trying to charge mine,am up to 2 cans of refrigerant,and the compressor is still cycling on and off.I know this is a sign of low refrigerant,but I don't want to overcharge it.Before I put a third can in,I would like to know how much factory specs state.Thanks!

You should pick up a gauge... some of those kits come with a decent gauge for that purpose. Get one with a reusable gauge...not one of those where the gauge is permanently attached to the can. The one I have...was around $20 with a can of R134-a has a piece on it that spins to show the ambient air temperature compared to the pressure since the proper pressure differs based on that. One day I'll stop being lazy and pick up a set of manifold gauges specifically for R134a systems since my current ones are only for R22/R410a and other similar refrigerants.
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Old 08-03-2010, 05:39 AM   #5
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It may have too much in it - the switch turns off/cycles for both low and high pressure.
It closes, pressure goes too high, shuts off, tries again.
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Old 08-03-2010, 08:29 AM   #6
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You added 2 cans, but how much was in it to start?

Most of the cans we deal with are 12 oz cans. 2 of them = 24 oz. If as it was said, the capacity is 1.25 lbs (20 oz,) just the 2 cans puts you overfull staring from 0. Add that to whatever was in it - and you are way overfull.

Q's - it was cycling before you added it? Were the tubes near the drier cold or very cool before you added?

If there is a restriction somewhere - like in the expansion valve, it will cycle because the pressure goes too high, the hi/lo switch shuts it off. If there is a restriction flushing may help, or replacing affected parts.

When you don't know how much is still in it but don't have the equipment to suck it out and store it, best way is use a thermometer (meat thermometer from the supermarket does fine) in the inside vent, windows closed, AC on high recirculating.

Add the freon slowly while watching the temp. Keep adding till the temp stops dropping and starts to go back up. Stop, finished! You are looking for maximum cold.
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Old 08-03-2010, 11:05 AM   #7
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Sorry, slight correction -
It's not a combination hi/lo switch - there are b2 seprate switches - the lo is by the drier, the hi is on the line close to the high side of the compressor.

The expansion valve is a fixed orfice type - any trash in the system they plug up. You need a special tool to extract them, but they are very cheap - about $5.00
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Old 08-21-2010, 12:57 AM   #8
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Check for leaks. If you have a leak, you are adding freon for nothing. There may be air in the system which could create cycling issues.

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