I am thinking about gettting my AC working and learn something in regards to working on auto AC's. I have a few questions:

1. What's inside of the TXV. How does it work and how do you test it?

2. Are there commom flushing agents that can be used instead of buying expensive AC flush agents? What are purpose made AC flush agents made of?

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked