Quote:
Originally Posted by WDBCB20
Lol. To be fair my '83SD did see 34°F (even below) at the vent at minimum of 45mph with outside temps of high 80's low 90's and typical FL humidity running Duracool (hydrocarbon) refrigerant. Of course in traffic/idling, as you note, it would go up to 50°F and more.
Have a can of grinding rocks R4 in my new '85SD giving at best 55°F at highway speeds so it's due for a refurb. Hence my previous question.
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The Gen I cars have a mechanical evaporator thermostat to trip the compressor to keep it from freezing the evaporator. They are supposed to trip right around freezing, but there's some tolerance and it's not uncommon to see vent temps in the low-mid 30s on them. The Gen II cars have a thermistor sensor that communicates with the pushbutton unit to trip the compressor at 3-5˚C (38-41˚F) so the lowest realistic vent temps you will ever see on a Gen II car is 42-43˚F under ideal circumstances regardless of what refrigerant is being run.
I've been thoroughly disappointed with hydrocarbon refrigerants. When the engine RPM is up and the car is moving, they cool like crazy! Painfully cold! Then you come to a stop light...... 65-70F vent temps are simply not an option for me, sorry. R134a seems to keep the Gen II cars at <55F at idle with the fan on high. Once the cabin has pulled down, it'll significantly longer to creep up into the 50s. Soon as you start moving, down it goes again.