My 1990 300d got R134 conversion. A week later, I heard 'hissing' from center vent... next 2 days air became hot again. Local hack who did not warn about higher 134 pressure may have forgotten other essential. I need smart guidance on best fix.

Apparently. The evaporator can be accessed/replaced from outside of firewall. Is this a viable option? http://www.2phast.com/190E/ac.htm

Am ready to replace all the parts behind dash myself. So I would greatly appreciate you help:

1. When should I test for leak? Need AC specialist or can I test myself?
2. Can I get evaporator without removing dash?
3. Any R&R pix/instructions for the DIYer?
4. Need testing/special tools or an AC guy while dash is off?
5. What brand/numbers of all parts to be replaced in dash + under hood?
6. Dark soft foam blowing out center vents. What do I need to replace?
7. Should I flush system & reload R12 or run R134 for next 10 years?
8. What other parts should I change in addition to the pressure switch and dryer?
9. What sequence – before/after flush/reload?
10. How can I find best [non dealer] AC shop in South FL.


Thanks for your advice.

profitsharing