Brothers of the Benz
My experience in returning part to Fast Lane has always been painless.
Your expansion block for $700.00 was for an evaporator cooling coil assembly. It also includes the gaskets and packing material.
If you intend on replacing this, dig deep into your piggy bank, $1600.00 to $3000.00 depending upon wheither it is dealer installed or independant.
Bringing your own parts to the party brings to surface lots of worms.
Suggest that your technican purchase the part where you got the best price, F.L. Then one person warrantees the work.
Happy Trails Beep Beep from The Spiderman in Houston!!!