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  how much R134a psi to put in A/C system - Posted: 05-06-2008, 08:20 PM
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Post #1

I am relplacing the compressor on my 03 1500. How much pressure should be on the high and low side when I put refrigerant in the system after I draw a vacuum. I have high and low side guages.
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ShortBus
 
 Posted: 05-06-2008, 08:25 PM
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Post #2

just put in the recommended amout of r134a.. there is a sticker under the hood that tells u the correct amount. but low side should be around 30-40 psi and high side around 320-340 IIRC..

i tried looking on dealer connect and all it says is
Refrigerant Charge Capacity Refer to the A/C Underhood Specification Label located in the engine compartment. R134a refrigerant

what if its missing the label? smart job chrysler.. dumbasses.
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piper18
 
 Posted: 05-06-2008, 09:38 PM
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Post #3

about 2 pounds is normal on most vehicals.
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darell_n
 
 Posted: 05-06-2008, 10:03 PM
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Post #4

Weigh it in exactly, that's the only sure way. Ounces can make the difference between go and no-go. The high side will depend entirely on the ambient temperature and load on the system. 320-340 psi would blow sh*t up fast on the industrial stuff I work on, but vehicles are different (160 normal for me). In the 300s would be reasonable, but seriously, weigh it in for your own safety.
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piper18
 
 Posted: 05-06-2008, 10:22 PM
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Post #5

I charged systems using those 1 pound can and would just throw a whole can in at a time, when it didn't cool good enough. you don't have to worry about over pressure since you have a high pressure cut off switch.
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Switch installed in chime circuit to turn off chime Click to learn How To add a switch to the chime circuit
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Tools Box w/ lights inside tided to cargo light
Custom made deer guard 2" pipe
Sportsmaster Tonneau cover w/top gun fabric
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ShortBus
 
 Posted: 05-07-2008, 12:21 AM
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Post #6

Quote:
Originally Posted by piper18
about 2 pounds is normal on most vehicals.
most dodges use less than 2 lbs. and overcharging it will NOT cool better, contrary to popular belief..
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piper18
 
 Posted: 05-07-2008, 09:45 PM
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Post #7

My 95 used 2 pounds on the head, my 08 uses 1 pound 11 Oz. The 95 I had in several times and they never could find the leak so I just kept recharging it with 1 pounders. On all vehicles there is a accumulator on the firewall which acts like a reservoir for the freon so as the freon quantity changes the A/C keeps working at the same level.
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Switch installed in chime circuit to turn off chime Click to learn How To add a switch to the chime circuit
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Tools Box w/ lights inside tided to cargo light
Custom made deer guard 2" pipe
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darell_n
 
 Posted: 05-07-2008, 09:56 PM
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Post #8

Technically, the accumulator is a safety device to stop liquid refrigerant from smashing the compressor (located on suction side of the system). The drier will stack with excess liquid.
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