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No cooling from front vents and no heating from rear vents.

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  • No cooling from front vents and no heating from rear vents.

    My Toyota Prado 1997 TZ has dual ac system.

    For quite sometime ac was not cooling so I evacuate the system and refill it.

    Now I am not getting cold air from front vents but the rear vents getting cold when ac is on. When I turn the heater on, hot air is not coming from rear vents.

    Somehow, I know its actuator door blend problem. But when I move temperature control nob, I can see one actutator driverside underdash is moving. This very temperature control nob also changes air flow mode. I dont know why.

    The ac button and mode button work only after pressing very hard and repeatedly.

    What could be causes and where I should look for ? I have no manuals


    I would appreciate a lot if you guys help me.

    Thank you in advance.

    Regards
    Jamal

  • #2
    The rear ac has no heater in it
    The rear heater is under the right hand seat
    I would have the tx valve checked on the front ac
    The rear ac blows cold air now?

    Comment


    • #3
      Originally posted by scottkz View Post
      The rear ac has no heater in it
      The rear heater is under the right hand seat
      I would have the tx valve checked on the front ac
      The rear ac blows cold air now?
      Yes the rear ac blows cold air now.

      I was searching for expansion valve underdash but could not find it.

      Where is tx valve situated ?

      Comment


      • #4
        The tx valve is inside of the evaporator box it cant be inspected needs the system evacuated then the evaporator removed and stripped down its always a good idea to replace the tx and the reciever drier when the system is open

        Comment


        • #5
          Thank you sir.

          What would be next in case if tx valve do not solve the issue?

          Actually I have to buy all these stuff from online.
          So I want to be ready for next step in case.

          Comment


          • #6
            Put power to the ac pump directly bypassing everything the front ac should blow cold then if it doesn't then id say its the tx valve they have a very small hole through them that blocks up with crap then the refrigerant dosnt flow through so no cold

            Comment


            • #7
              Originally posted by scottkz View Post
              Put power to the ac pump directly bypassing everything the front ac should blow cold then if it doesn't then id say its the tx valve they have a very small hole through them that blocks up with crap then the refrigerant dosnt flow through so no cold
              I could not understand that how to put ac pump bypassing everything?

              Can you please explain so that I can follow your instructions.

              And Kindly tell me what tools I need to disconnect ac lines from evaporator?

              Thank you
              Jamal albalushi
              Lurker
              Last edited by Jamal albalushi; 23-09-2017, 02:58 AM.

              Comment


              • #8
                You just need a plain thin wire one side on 12v battery the other end on the ac pump electric plug when it is unplugged
                To remove the evaporator you only need a small flat screw driver and a 10mm socket, it comes out from inside the cabin after to glovebox is removed

                Comment

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