A/c works then quits, also high side fitting doesn't fit

klemsontigers7 on Fri August 02, 2013 2:03 PM

Year: 1995.5
Make: Toyota
Model: Tacoma
Engine Size: 2.7L
Refrigerant Type: R134a
Pressure Low: baddd
Pressure High: ????

I have done some A/C work on my truck in the past. I had to replace hoses and vacuum and recharge it two summers in a row. Now it runs for about 15-20 minutes before quitting

When it quits, the compressor clutch is still engaged and the low side reading is on 0psi usually. Sometimes it pulls a vacuum on the low side. Does this sound like a TXV problem? If it's a TXV problem could my A/C actually work for a while and then quit? When the truck sits for a couple of hours it will work again.

Also, I can't check the high side because I can't get the quick disconnect fitting to fit. I know when I vacuumed and recharged myself about 3 years ago I was able to check the high side.... so I guess I want answers on that as well.

TRB on Fri August 02, 2013 6:24 PM

Check for leaks - Repair - Evacuate & Recharge.

Was a sealer used, could and a plugged system also.

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Edited: Fri August 02, 2013 at 6:25 PM by TRB

klemsontigers7 on Mon August 05, 2013 6:59 AM

A sealer wasn't used, unless it was used about 3 or 4 years ago. I don't think I'm low on R143a. A couple of weeks ago I added some because I thought that I was low and possibly freezing up the evaporator. When I did that, my compressor would run 4 seconds and cut off for 4 seconds with a very noticeable noise near my evap that sounded like a switch or something opening and closing. It made sort of a thump every time the compressor would kick on or off. I thought I was probably hitting the high pressure switch then immediately opening the switch back up. I know the TXV is housed near the evap, would it be making that noise?

mk378 on Mon August 05, 2013 8:58 AM

It could be:
Frozen evaporator -- you're likely to see frost on the lines too.
Faulty TXV
Severe water contamination causing water to freeze inside the TXV.

The clicking you hear near the evaporator could be the temperature switch. TXV systems cycle on evaporator temperature. If it fails to cycle off, evaporator will frost over and cooling is lost.

Edited: Mon August 05, 2013 at 8:59 AM by mk378

klemsontigers7 on Mon August 05, 2013 2:11 PM

Thanks, the clicking sometimes stops if I turn the A/C off then back on... not sure why.

mollygomez on Fri November 01, 2013 12:57 AM