Automotive Air Conditioning Information Forum

PS: I just found this chart (hope it posts). It is relative humidity temperature service port pressure chart.

Interpolating it we should find a little different than I expected:
45-50 low side, 365/380 high side at 86 degrees 66% humidity. I feel better, however something is still not right.

post ...

UPDATE: Took a rain day. I purchased some 5000scf (3000 up to 6000 is spec from Toyota) silicone from a hobby shop and rebuilt the fan clutch today with 50cc per spec as the bearings are fine. I reinstalled the fan and tested it, definitely higher output of air and higher rpm. 1000 rpm fan at idle ...

Thank you for the full explanation. I did not cherry pick any information, using only that which was available...the 70% value is supposedly the highest RPM for a standard duty thermal clutch so the math works. However I will bow to your experience and go ahead and freeze up the clutch and try again ...

Ok here we go. I used these UAC part numbers from rock auto kit:
UAC KT3742A
UAC CN3932PFC
UAC CO21008C
UAC EX7012FC
UAC RD1224C
UAC RS2581
UAC RO0900B
Then when this problem occurred I changed the TX valve: Napa 207306 which shows for 1994 so IS a 134a part number.

I checked the specs for ...

In my most recent numbers I did NOT use any water on the condenser. In the past I have sp;ashed water on the condenser and saw immediate reaction, but there will not be water available when driving. there is an instant reaction so no need to check farther.

I did not see the compressor cycle at all ...

Please remember that this was a functioning ac system except for a very slow compressor leak.
Ok, I checked the fan clutch, the fan will not spin more than 2 blades by hand cold or hot. There is no wobble in the clutch. The fan spins at about 640 at idle (laser tach) of 750 (laser tach with two ...

it was significant, brought it down QUICKLY and with enough brought water splashed liberally and literally brought it to about spec. I used a laser across the condenser and down it. There were no obvious cold spots heat seemed to dissipate evenly top to bottom/ left to right etc

That is exactly ...

First this was a functioning system before the part replacement. The only issue was a VERY slow leak, as in a week or longer before any decrease in cooling.

Yes, when I cool with water on the condenser the high side pressure drops significantly. This is a new UAC condenser, should I consider it ...

Ambient 85
low pressure 40
high -starts at 225ish and climbs steadily> I shut down at 350ish
The vent temps are 50ish but.....this rise in pressure is so quick that I shut down.

Valves are closed when testing.

What is max pressure before I should shut down the system when testing? I do not want to ...

Had a leak in my compressor. Replaced compressor, txv, dryer and condenser all new orings, flushed all lines, cleaned evaporator, oil charged etc.

After reassembly vacuumed and charged. Low pressure good, high pressure continually climbing. No issue with leaks.

Assessed blockage according to ...