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Thread: A/C recharge "How-to"?

  1. #21
    Join Date
    Jan 2006
    Location
    KY
    Posts
    37

    Default

    LP fill port is directly below the power steering reservoir (sp?)
    The port up front is the high pressure port.

    As a general rule, look at the tubing size it is connected to. The small tube size is high pressure, the larger tube size is low pressure. Same on a home air conditioner. The smaller carries high pressure gas out of the compressor to the condenser to be turned into a liquid. The larger carries gaseous refrigerant from the evaporator inside the car at a low pressure to the compressor.

  2. #22
    Join Date
    Oct 2004
    Location
    New England
    Posts
    676

    Default

    OK, how come they make it so easy to get to the high pressure one and bury the low pressure one? Sounds screwy to me. Anyone else?

  3. #23
    Join Date
    Nov 2004
    Location
    CA
    Posts
    763

    Default

    It is the best to remove any old R134a and moisture from the system. But for DIY that is impossible unless vented into the air which is illegal. My recommendation for everyone is bring it to a certified A/C technician. Keeping the A/C components in working and proper order will keep the system running.
    [2002 V70 XC] Venetian Red Metallic/Blk Leather*33k+ miles
    -Hands-Free Phone Set, all packages except Nav.
    Turbocharger replaced April/2005 under warranty.


    [1991 245] Metallic Blue/Blue Leather*175k+ miles my daily beater.
    [1994 854 GLT] *141K+ miles


    Member of Volvo High Mileage Club and the miles keeps ROLLING!!

  4. #24
    Join Date
    Oct 2004
    Location
    New England
    Posts
    676

    Default

    Shawn_75. Thanks for that.

    Recharged it last night on the low fill which is under the power steering fill. Works like a champ. Took probably 15/16th's of the can of freon, letting the remainder go.

    I'm now in for $37 for 2 cars for another Summer versus $180 at the Volvo stealership and probably around $60 for the Jetta for a savings of $203. I have another can as a spare for when it gets real hot at the end of August or Indian Summer to split a half for each car since it wasn't quite up to the highest level when I stopped this time around. Not bad, not bad at all.

  5. #25
    Join Date
    Jul 2010
    Location
    illinois
    Posts
    1

    Default Easy recharge for '02 xc70

    1) Refill through the LOW pressure tap under the power steering reservoir.

    2) Displace the reservoirs first to make access to the tap easier and reduce the risk of rubbing against the moving belts. Leave the reservoirs attached to their hoses and just lift them up and out of the way.

    3) Use a kit with a gauge on it. Fill to between 25 and 45 psi as per the instructions.

    Takes five minutes.

  6. #26
    Jerrymcc Guest

    Default

    The high pressure port is the one up front protruding up through the hood striker plate...This port is to be use ONLY when the system is under a vacuum and the engine is NOT RUNNING!!!...Compressor pressures close to 250 pounds exist at this port and could burst the can causing serious injury...In short, this port is for the pros...The insructions for using an electrically heated container, etc. is intended for the pro with the proper equipment...

    The low pressure port is down under the power steering reservoir near the serpentine belt...This is where topping-up is done with Walmart/Auto Barn kits...When charging, loosen the hose connection at the gauge a bit and allow a small amout of refrigerant to escape before puncturing the can...This purges the air from the hose which could contain moisture...If moisture gets in, it can form acids that eat up the plumbing, and if there is enough, it can freeze in the expansion valve and stop operation...

  7. #27
    Jerrymcc Guest

    Default

    For those who are interested, there is a good web site (www.aircondition.com) that has tutorials on everything you need to know about A/C, how to recharge, how to interpret gauges, static pressures, etc...Lots of links to more info, parts, etc...

  8. #28
    Join Date
    May 2009
    Location
    Chocolate Town USA
    Posts
    1,185

    Default

    Going to copy exactly what you should do ...

    ) Refill through the LOW pressure tap under the power steering reservoir.

    2) Displace the reservoirs first to make access to the tap easier and reduce the risk of rubbing against the moving belts. Leave the reservoirs attached to their hoses and just lift them up and out of the way.

    3) Use a kit with a gauge on it. Fill to between 25 and 45 psi as per the instructions.

    Takes five minutes.


    Other good info posted right above me .
    The high pressure port is the one up front protruding up through the hood striker plate...This port is to be use ONLY when the system is under a vacuum and the engine is NOT RUNNING!!!...Compressor pressures close to 250 pounds exist at this port and could burst the can causing serious injury...In short, this port is for the pros...The insructions for using an electrically heated container, etc. is intended for the pro with the proper equipment...

    The low pressure port is down under the power steering reservoir near the serpentine belt...This is where topping-up is done with Walmart/Auto Barn kits...When charging, loosen the hose connection at the gauge a bit and allow a small amout of refrigerant to escape before puncturing the can...This purges the air from the hose which could contain moisture...If moisture gets in, it can form acids that eat up the plumbing, and if there is enough, it can freeze in the expansion valve and stop operation...


    = acutally the acids build up and destroy the compressor =


    What iI used to work on


    IE the name - Chilledman
    2012 Ford Fusion 2004 V70XC 01 V70XC -M66 1998 C70 T5-M66

  9. #29
    Jerrymcc Guest

    Default

    Cool, Chilledman:

    How many tons is that "window-sill" unit?...At Grumman AC in the 90's we still had water cooled units on the roofs of the hangars...

    Quote Originally Posted by Chilled Man View Post
    Going to copy exactly what you should do ...

    ) Refill through the LOW pressure tap under the power steering reservoir.

    2) Displace the reservoirs first to make access to the tap easier and reduce the risk of rubbing against the moving belts. Leave the reservoirs attached to their hoses and just lift them up and out of the way.

    3) Use a kit with a gauge on it. Fill to between 25 and 45 psi as per the instructions.

    Takes five minutes.


    Other good info posted right above me .
    The high pressure port is the one up front protruding up through the hood striker plate...This port is to be use ONLY when the system is under a vacuum and the engine is NOT RUNNING!!!...Compressor pressures close to 250 pounds exist at this port and could burst the can causing serious injury...In short, this port is for the pros...The insructions for using an electrically heated container, etc. is intended for the pro with the proper equipment...

    The low pressure port is down under the power steering reservoir near the serpentine belt...This is where topping-up is done with Walmart/Auto Barn kits...When charging, loosen the hose connection at the gauge a bit and allow a small amout of refrigerant to escape before puncturing the can...This purges the air from the hose which could contain moisture...If moisture gets in, it can form acids that eat up the plumbing, and if there is enough, it can freeze in the expansion valve and stop operation...


    = acutally the acids build up and destroy the compressor =


    What iI used to work on


    IE the name - Chilledman

  10. #30
    Join Date
    Oct 2004
    Location
    New England
    Posts
    676

    Default

    Need to recharge it again, and figured I'd bump the post.

    Still astounded at how ridiculous it is that the one you need to use to refill it is under a greasy tube and near some moving belts, and the one you don't touch is up front with easy access.

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