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How well does your AC cool the car? Mine is cool but not cold. It has been unusually hot 95+ here and humid but I think my last 993 the AC worked better. Also, what exactly does the MAX AC button really do? It's the top snowflake button in the pic. Mine doesn't seem to do anything? How cold should the air blowing out of the vent be at it's coldest? Can I just measure it with a kitchen thermometer? If it's not working properly, is it likely a freon recharge?
My AC blows cold. The snowflake button seems to kick it into high gear. The "sliders" don't seem to do anything in my car. The middle/passenger vent doesn't blow anything.
The large snowflake button on the AC is the "AC Max". It's like an easy button for the AC. It puts the fan speed on high and closes the recirculation and directs the air to the vents. If it doesn't do anything for you, then you probably have some kind of issue with the Climate Control Unit (CCU). If you press it, the air blows max and from different places.
HVAC and CCU issues happen. Tore has a good write up:
When I was low on freon it just stopped cooling completely. This was a weekend before a 700 mile mountain road trip in. the mountains in June. I pulled a Hail Mary and bought a can of freon at Advance Auto....it worked.
My experience is that the AC vents always blow cool even in very hot weather. The issue is the amount of glass in the cabin overwhelms its capacity.
What year is your 993? Later ones also used an actuator that should make a loud kerchunk when you press the recirculation button that opens an intake passageway behind the CCU directly to the evaporator coil. This should increase apparent cooling quite a bit. Also if a servo is not closing fully the system can be mixing warm air with cold raising vent temperatures. If a servo is the issue it will show if one runs the OBD Codes if no kerchunk behind the CCU just pull it out and investigate a broken and easily replaced pivot pin that is part of the opening mechanism on later cars. If it has been cool in the past one can go to Walmart buy a can of refrigerant and run it in too.
Andy
Quantify that.
Get a decent digital thermometer.
Take the car for a drive, turn on the AC system, let it run for at least 10 minutes.
Carefully stick the digital thermometer outside the window and get a reading of the outside air temp.
Write it down.
Put the digital thermometer in the vent. Let it take a reading for about a minute or so.
Write down the reading.
Originally Posted by M Fig
If it's not working properly, is it likely a freon recharge?
Find out.
Have a local shop toss on a set of gauges.
Take the reading after the AC has been running for at least 10 minutes.
Write down the low and high side pressure.
And, while you are at it, take out that digital thermometer and note the average air temperature
around the car when you document the pressure readings.
Have an a/c shop check the pressures. Since it blows somewhat cold, you can likely get away with a recharge. Although it's worth keeping in mind that the evaporators on these cars do seem to be prone to failure.
07-08-2020, 06:30 PM
AC Blows cold-ish
