I just had my (stock) 88 Carrera converted to 134a and it's blowing 41 degrees out of the vents. My previous 88 Carrera also had 134a and it was comfortable stuck in traffic in Tampa on a 93 degree sunny day on the second fan setting. The real key is to make sure everything is working properly (especially the front condenser fan), the condensers are clean, the 134 is topped off and it also helps to just remove the bowtie vent from behind the shifter. Also remove the carpeting and floorboard and make sure the big air intake in the passenger footwell isn't blocked (aftermarket stereo installation, for example).
Consider tinting your windows and definitely don't let the car bake in the sun all day, it won't catch up if you let it do that. Get a cover if you have to park outside.
The 134a conversion is straightforward and relatively inexpensive; evacuate the R12, change out the receiver dryer and compressor fittings, and fill 'er up. With R12 going as high as $100 a pound, it's a wash between the two.
Vic
88 Carrera
[This message has been edited by vjd3 (edited 06-02-2001).]
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