Air COnd TX Valve replacement on a 407
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Thread: Air COnd TX Valve replacement on a 407

  1. #1
    Fellow Frogger!
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    Default Air COnd TX Valve replacement on a 407

    I have been advised to replace the Thermal Expansion (TX) Valve on our 2007 407 Sedan to improve the cooling of our air cond system.

    Has anyone done this before? WHat is involved? Any instructions on how to do this? or is it a job for a specialist?

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  2. #2
    1000+ Posts cav91's Avatar
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    Probably not a whole lot of help but on a 307 it's about a 15 minute job. I think 407s where similar in design. Were the tx valve is were the a.c. pipes go through the firewall.

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  3. #3
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    The handbooks call it a Détendeur, and it's at the bulkhead beyond the high and low pressure valves. You will need a refrigerant licence.
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  4. #4
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    oh, ok. So I should have an air cond person do it. Thanks for that.

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    It's a metal block, with passages so that both the high and low pressure circuits pass through it. Inside are small passages fitted with a regulating valve. Removing it means disconnecting the refrigerant pipes, so take it to someone with the gear and the gas.
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    There's a pic in this ad - https://www.24piecesauto.fr/climatis...on/peugeot/407
    It's a small but high precision bit of gear.

    I found a sectioned drawing of a Ford unit: Air COnd TX Valve replacement on a 407-screenshot-2.jpg

  7. #7
    1000+ Posts robmac's Avatar
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    Unless you are sure that you can complete the task, leave it to an expert.

    Technically, you are required to have a refrigerant handlers license to de- pressurise the aircon system.

    It's usual to replace the filter dryer whenever opening the the refrigeration system.

    Do you have a vacuum pump, manifold gauges, refrigerant scales and a supply of refrigerant (probably R134a) to re-charge the system?
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