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Trying to find the low pressure line to refill the R134a

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The lowpressure side is the line gling back to the compressor from the evap. it should have insulation on it. there arre no ports and one will need to be added.

Posted on Aug 31, 2008


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Posted on Jan 02, 2017


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How do I refill my window ac with r22? Model Samsung capacity 10500btu.

First, R122 is no longer available, as it has been banded by the EPA. You will need to use R134a refrigerant. To recharge the compressor, you will need the gauges and hoses used to to balance the high and low sides of the compressor. You generally buy this as a kit from from most auto parts store for around $100.00 The R134a refrigerant runs about $8.00 or $9.00 per can. You should purchase 3, just in case. But, 2 cans will usually do it. In addition, by law, you are supposed to capture any of the remaining R122 (Freon), when you evacuate the system. Don't mix any of the remaining R122 with the new R134a.

Once you have acquired all the necessary tools and gas, remove the inner chassis from the outer cabinet of the AC unit. Locate the refrigerant ports on the compressor and connect the high and low pressure lines accordingly. Your Owner's Manual can assist you in locating therm. It should tell you what the ideal pressure should be on the high and low sides.

Hope this helped you and thanks for choosing FixYa.

Aug 21, 2011 | General Electric ASD06LK Thru-Wall/Window...

3 Answers

I want to recharge the a/c of my 2004 Rainier, but do not know where the low pressure port is and the caps are not marked with L or H. Help! Thank you.

The good news is a that vehicle has R134A which means the quick release from your refill can will only fit the low pressure side which is normally a little higher than the High. Unlike the old R22 systems the Low and High pressure connections are slightly different in size.

Apr 02, 2011 | 2004 Buick Rainier

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Were di i recharge the ac on my car

if it is the 3.4 v6 the low side is on the passager side behind the motor. it should have a blue cap on it, and the low side is the fatter of the two ac lines

Aug 08, 2010 | 1994 Pontiac Grand Am

1 Answer

Which line high pressure A/C line and which is the low pressure on a car?

The low pressure line should be the larger of the two lines. If you have 134A and are trying to refill it the connector will only fit the Low Pressure side as they are different sizes. Today's refill kits come with the connector and it only fits one side.

Jul 10, 2010 | Chrysler Concorde Cars & Trucks

1 Answer

Ac problem

the refill bottle shouuld never be attached to the high pressure side (high side) .. the connections are different to prevent that .. if you did manage to hook that up, there would be great danger of the bottle exploding ... so you can only hook the bottle up to the low pressure side (large piple) ... the retrofit kit should have included adapters for both high and low pressure sides ... the correct adaptor should fit the R134a refill bottle hose ... it should also fit the low pressure port (you may have to remove the valve in the old port (read instructions for that) .. if the adapter does not fit then you might check with a dealer or air conditioner supply house for a special adapter ... R134a and R12 are completely incompatable so make sure you have washed out the system and replaced the dryer and sometimes the hoses ... you cant have any of the old lube left in the system .. its generally a good idea to replace all rubber parts for the changeover .. you will need to pull a vacuum for a couple of hours before refilling .. .

Jun 30, 2010 | 1990 Ford Bronco

1 Answer

Where are the high and low side connections for the ac located

I assume you mean the High pressure line and the low pressure line. They run from the compressor to the condensor on the left side of the engine compartment as you face the engine. If your trying to identify which is the low pressure line. Your refill fitting will only fit the the low side if you have R134A . If you have R22 refrigerant you will need to get the Haynes or Chilton's repair manual on the vehicle to identify the proper line. There is normally a small dryer on the low side. If you don't have the manual for this a pressure gauge is a necessity.

Jun 26, 2010 | 1988 Plymouth Reliant

1 Answer

Where is the low pressure port to fill ac

The low pressure port should be on the Accumulator, that's the silver cylinder that has the low side A/C line going in to it. You'll see the valve on the cylinder for you to add the R134a, do not aver fill the system. Safest way is to open and close the refill valve and let the A/C run for 2 min and see who cold the system is getting adding little at a time. To much R134a in the system will also give you poor A/C performance, to high of pressure in the system will shut down the compressor also.
Thank you for using fixya and when you think the air coming out of the vent is cold enough, stop charging the system.

Jun 02, 2010 | 1997 Chevrolet Lumina

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A/C compressor off - how to restart it?

it is on the large ac line/hose ,it is the small service port the larger service port is on the small line/hose is the high side dont fool with it to reset ,,, disconnect the negative battery cable for 20 seconds and re connect

Jul 03, 2009 | 1995 Cadillac DeVille

1 Answer

Where is the low pressure line to add r134a to a 1997 dodge ram

The low pressure line is the larger of the two lines and i believe the low pressure line has a blue cap on the valve, and the high pressure valve has the black cap on it. 
Follow the two lines from the compressor, the line that goes to the condenser (to the front of the truck) is the high pressure line. The other line that comes from the firewall is the low side and will have the refill port with a blue cap on it.
Good luck and hope this help. There should also be a sticker somewhere in the engine bay to the amount of R134 should be in the system.

May 29, 2009 | 2004 Dodge Ram 2500

1 Answer

I need to put R134a in my montero and can`t find the low pressure

The low pressure line is the larger line out of the two and the cap is larger then the high side. follow the two line from the fire wall to the compressor and evaporator.

Good luck and hope this helps. keep me posted if you still can not find it.

May 25, 2009 | 1994 Mitsubishi Montero

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