<human>: I've got an old Volvo that uses the old R12 standard for air conditioning - and it's not been working since I've had the car. Now that I've got some money sitting aside in the bank, I'd like to look at the costs of getting it fixed.

A few talks with gear-headed friends and local mechanics left me with an easy and obvious answer:

"All you need to do is convert R12 to R134 and then have it recharged."

Which also followed up with "However, I don't know who disposes of R12 in the area - which is the hard part."

My Google-Fu was not strong enough to find a clear answer of costs, let alone a place locally that does it - and I've been at it longer than I want to admit.

Provide a brief overview of the text.
<bot>: I need an idea of how much it costs to have R12 converted to R134, and if there's anyone local to St. Louis that can do it.