how much R134a psi to put in A/C system - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
 
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#1 Old 05-06-2008, 09:20 PM
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how much R134a psi to put in A/C system

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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#2 Old 05-06-2008, 09:25 PM
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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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#3 Old 05-06-2008, 10:38 PM
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about 2 pounds is normal on most vehicals.

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#4 Old 05-06-2008, 11:03 PM
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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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#5 Old 05-06-2008, 11:22 PM
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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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#6 Old 05-07-2008, 01:21 AM
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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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#7 Old 05-07-2008, 10:45 PM
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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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#8 Old 05-07-2008, 10:56 PM
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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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