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High side port w/o schader valve and other questions

Rickster356 on Sun September 02, 2007 4:53 PM User is offline

Year: 1992
Make: Oldsmobile
Model: Toronado
Engine Size: 3.8
Refrigerant Type: 134a converted
Pressure Low: 0
Pressure High: 0
Country of Origin: United States

Hi fellas.

I am preparing to replace a compressor on a 92 Toro. A little background. I have 4 of these Toros (2 for parts). The A/C compressor failed in one of the good Toros. When I removed the compressor, the oil was contaminated with what appears to be fine dark particulate. So I have stripped the condenser and hoses/tubing off one of the parts cars and plan to use it for replacement since it appears clean. I bought a rebuilt compressor, a new dryer and a new orifice. I also got a vacuum pump from this site. I will be converting to 134A. So, I think I am about ready, except for a few questions.

I noticed that my R-12 gauges wont thread onto the high side port. A closer look revealed the port is undersized and has no schrader valve. The fitting is threaded into a fitting welded in the tubing. I dont see anything in the OEM manual about this. The three 92s have the same style high port. The 91 has a standard R-12 port. Can someone tell me what the deal is?

While unthreading the condenser hose fitting, it seized. I can turn it about a quarter turn back and forth until it locks up in either direction. Penetrating oil doesnt help. These cars are scarce, so I do not want to ruin the fitting. Anyone have any experience with this problem?

TRB on Sun September 02, 2007 6:11 PM User is offlineView users profile

Sounds like the standard 3/16th service port and someone removed the scharder valve.

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Chick on Sun September 02, 2007 7:26 PM User is offlineView users profile

The 91 to 93 GM's used a "deep throat" high side, which is still the same threads as the high side Tim mentioned. But the shrader is actually a teflon button deep inside the service port. If you are going to use the R12 service ports (You should not, if converting to R134a) then you will need the deep throat adaptor..GM 91-93 service port adaptor as shown in the pic linked here..Also check out Ackits.com for the new accumulator you will need, and new O ring kit, nylog assembly lube, O tube (I would use the Ford blue O tube on that). Your Toro will retrofit well, but you do need to do it right..,There are no shortcuts in AC repair....

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Rickster356 on Sun September 02, 2007 7:35 PM User is offline

I should add. The high pressure port is this way on three 92 car Toros from different parts of the country. I bought one of these cars new and I know for certain that the A/C on it has never been touched, other than I added a can of R12 at the lo side port. The mystery hi side port has a cap, which if taken off, does not leak freon. The port throat has no treads for a valve core. When I gently probe the bottom of the port throat, it feels a little spongy. I checked the OEM manual and it has a nice sketch identifying this as the high pressure port. If this doesn't ring any bells with you guys, I will get a pic.

Chick on Sun September 02, 2007 7:40 PM User is offlineView users profile

Read my post, it's a deep throad high side and you need the adaptor if you are going to use to read pressures.

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Rickster356 on Sun September 02, 2007 7:40 PM User is offline

Whoops. Thanks for the info. Looks like we were typing at the same time. Thanks for the reply. Sounds like I am not quite ready to do this one yet. I did get a oring kit and an o tupe tool from ackits when I got the vacuum pump. I already had the compressor, accumulator and O tube. I also have some 134a port adapters.

One more question. I know that this system is computer controlled using temperature sensors instead of pressure switches. Will that cause a problem in using 134A?

Chick on Sun September 02, 2007 7:54 PM User is offlineView users profile

usually not, but that is why I use the Ford blue O tube in retrofits, since the pressures will be close to those of the R12 system. You compressor cycles off the refrigerant temp/pressure switch, not a cycling switch..So go with the ford blue, and if you do have a low refrigerant code set with a full system, then adding a 2k resistor to either one of the two wires of the low side temp/pressure sensor will solve it. I have not needed to do that yet though... Tim doesn't show the retrofit adaptor on the web site, but they do have them for the GM high side. Just send them an e-mail and ask for the one that screws into the high side line when the old one is removed, or remove the old one and knock out the teflon ball and then add the standard 3/8 high side adaptor. Either will work..Hope this helps..

I'll try to find a pic of the high side adaptor in a little while...
Ackits.com e-mail address

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Chick on Sun September 02, 2007 7:57 PM User is offlineView users profile

The retrofit adator for R134a will look like this one..Hope this helps..


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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Edited: Sun September 02, 2007 at 7:58 PM by Chick

Rickster356 on Sun September 02, 2007 8:47 PM User is offline

Thanks extra info. I just want to say that I checked around before buying (my first) batch of stuff from ackits. I found that although I could save a few (very few) dollars by going elsewhere, the advice you guys give is worth many many times what I could have saved. I believe in supporting sites like this, so I will be buying my parts here from now on.

Oh, and I drive and work on these old Toros because I want to, not because I have to. I can afford the time and money to do it right. So I really appreciate you guys warning me before I do something stupid or half baked. This is the first time I have done more than add freon to an A/C system.

Does anyone have any thoughts on my stuck hose connector? I am guessing someone before me has stripped or galled the threads.

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