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93 toyota 134 high side fitting leak

echeeves on Tue May 18, 2010 3:54 PM User is offline

Year: 1993
Make: toyota
Model: pickup
Engine Size: 3.0
Refrigerant Type: 134
Ambient Temp: 80
Pressure Low: 45
Pressure High: n/a
Country of Origin: Japan

I converted to 134 last year and the high side fitting leaks very bad when I hook it up. the gauges are cheap and I am going to order some quality ones soon. don't know if that is the problem though. any ideas,tips?

There was no refrigerant in it (checked with gauges-0 pressure...)I was going to charge it up to find the leak. high side schrader valve was leaking before I got 1 can in it, so i think that may have been the leak source. I replaced the schrader valve and got the system back to 0 pressure...I put slightly less than two cans in(leak in schrader valve is gone for now). the full charge on the sticker is 1.76 lbs of r-12. I calculated 80% of 134 to be 22 ounces...let know if am wrong on that.

I can't get a high reading because of it leaking when I try to hook it up but the low side only goes down to 45 @ 2000 rpm. based on how much I have in the system, I would think it is full. I have made other posts in the past on this same vehicle if any of you are interested in seeing the history of my work on it...

What do guys think about the charge level and only being slightly cool?

mk378 on Tue May 18, 2010 4:11 PM User is offline

Any time it's leaked down to zero and/or you've opened the system, you really need to evacuate before recharging. New receiver drier is also a good idea for systems that sat all winter with zero pressure due to a major leak.

The aluminum adapters found at cheap parts stores tend to leak like crazy-- try a yellow steel one like AMA sells. You should also be able to find them at better local parts stores. Check the o-rings in your gauge set's coupler.

echeeves on Tue May 18, 2010 4:23 PM User is offline

I did buy a brass high side adapter at carquest. when I put it on I didn't even get it tight and it was leaking like damaged the schrader valve in the adapter like i put it on too far. is there a different one for imports?

mk378 on Tue May 18, 2010 6:28 PM User is offline

Use an adapter that has its own shrader valve-- remove the stock valve and leave it out. A standard 3/16 fitting should work on Toyotas.

echeeves on Tue May 18, 2010 6:38 PM User is offline

"remove the stock valve and leave it out." -learn something new every day!! thx...should have thought of that....

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