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Thread: Replacing A/C thermo expansion (TX) valve

  1. #1
    Join Date
    May 2008
    Location
    Camp Hill, Brisbane
    Posts
    169

    Replacing A/C thermo expansion (TX) valve

    Looking at replacing the TX valve to get A/C working again. After depressurising and retrieving the refrigerant by A/C shop, it looks as through the valve block is accessible by releasing the A/C hose retainer plate high up on the engine side of the firewall according the RAVE. Will this release the the TX valve block entirely or do I need to get at it from the dash side as well? (ugh).
    TIA
    Steve

  2. #2
    Join Date
    Jan 2016
    Location
    Netherlands
    Posts
    135
    I have a wrecker in the backyard and recently removed the AC so I'll make a few pictures for you Not sure where that valve is situated though. It has been suggested to me that it may be broken on my car. I'll post pics in an hour or so.

    -P

  3. #3
    Join Date
    Jan 2016
    Location
    Netherlands
    Posts
    135
    there you go!

    as you can see the interior is completely gone. If you loosen the tubing on the engine compartment side and push them aside, you will find this block sticking out. The rubber you see beneath the block sits on the inside of the car. Loosens the two bolts and the block kan be pried off. There is a metal plate into which the bolts are secured that does come loose once the bolts are taken out, the rubber however should prevent it from falling out. If you take care I see no reason why you can not undo and replace the whole thing from the engine compartment side

    hope this helps!

    -P
    IMG_2164.jpgIMG_2165.jpgIMG_2166.jpg

  4. #4
    Join Date
    May 2008
    Location
    Camp Hill, Brisbane
    Posts
    169
    Quote Originally Posted by prelude View Post
    there you go!

    as you can see the interior is completely gone. If you loosen the tubing on the engine compartment side and push them aside, you will find this block sticking out. The rubber you see beneath the block sits on the inside of the car. Loosens the two bolts and the block kan be pried off. There is a metal plate into which the bolts are secured that does come loose once the bolts are taken out, the rubber however should prevent it from falling out. If you take care I see no reason why you can not undo and replace the whole thing from the engine compartment side

    hope this helps!

    -P
    IMG_2164.jpgIMG_2165.jpgIMG_2166.jpg
    Brilliant - thanks heaps!

    Steve

  5. #5
    Join Date
    Feb 2013
    Location
    Gosford, NSW, Australia
    Posts
    2,408
    It all happens under the bonnet

    Of course when you fit the new one you need to make sure you have the correct type of o-rings

    It was a pretty easy job in the end

    Steve
    MY96 4.6 HSE P38. Niagara Grey; "The Phoenix"
    MY99 4.6 HSE P38. LPG, Blenheim Sliver; "Voldemort" burnt to a cinder
    MY79 RR Classic, Gone, MY57 Series 1 SWB, Long gone
    P38 write ups and info on my website http://p38.hts.com.au/

  6. #6
    Join Date
    Apr 2010
    Location
    Lower Hunter Valley NSW
    Posts
    314
    I can confirm what Steve said regarding access from the engine bay. Recently replaced and re-gassed mine. Just make sure that you get the alignment right as I had a tiny little leak there when I vacuumed up.

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