fbgh2o

The AC on my 951 works reasonably well. It does not blow ice cold, but could enough to keep a black interior cool.

However, the AC evaporator does not appear to producing any condensate. There is never a a puddle under the car. I have checked the drain tube and it is clear - ran water through it from under the dash. Nor is there any sloshing sound that would indicate that it is not draining.

Note I did recharge it earlier this year with a DIY kit. The low side pressure was a bit high for a while after the recharge, but I did purge a bit to get it back to the normal recommended pressure.

Any ideas what is happening?

V2Rocket

High pressure in the system may indicate a blockage somewhere like the expansion valve.

No condensate probably means it's just not getting cold enough or your area's air is not very humid.

fbgh2o

My guess was that I overfilled it. The AC seems to work better with the lower pressure (33 psi vs. 48 psi) at ambient of 78F.

xsboost90

well if its 134a you should be running around 25 psi on the suction side- but keep in mind temp in your area matters- just fill it until the sight glass on the top of the drier stops bubbling then stop. An R12 charge will take alittle less but should run about the same, maybe a tad lower.

fbgh2o

Thanks Dan. It's R12.

Hollywood D

Could just be the car. My 944 doesn't drip any, my 3 series doesn't drip any. I drive a few different cars at work, Fords and Chevy's and they both drip water like crazy.

griffiths

Fergus,

Maybe if you can provide the following data it would help:

1) What type of refrigerant oil are you using and how much?
2) Your best guess of how much refrigerant you put in the system excluding any you used to purge the hoses?
3) At idle, the ambient air temp?
4) At idle, the low side psi?
5) At idle, the high side psi?

If you did not record 3-5 then rerun the tests.

Griff

fbgh2o

Griff


1. Refrigerant is Red-Tek R-12a (http://www.canadiantire.ca/AST/brows....jsp?locale=en)

2. Each can is about 18oz R-12 equivalent. I would say that I have 30 oz added

3. 80F

4. I cannot measure the high side pressure,

5. Low side pressure is 33 psi.

griffiths

I would use R134a in your climate.

Either get yourself a set of service gauges or have a local shop provide you the high side reading.

xsboost90

did you charge it until the sight glass cleared or until the cans were empty? I know the r12 cars take alittle over 2lbs but thats 4 oz over... may be overcharged and running high head pressures.