i cant seem to get into my other post and what i was wondering is how i would pressure test my ac , i know i need the gauges but is thier anything else? i was told i probaly blew a relief valve, where would this be and would i need to replace it? i am willing to buy the gauges and i have acces to a comercial grade air compresser what would i need to get my ac up and running again... its a 93 so i would assume its still running with R-12, and is there a great advantge to "retro fitting" to the R13? sory for all the questions


Dave

 

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the price of R12 is shocking and it can be difficult to find....R134 is the auto industry standard now and is available even on grocery store shelves

 

The relief valve is located on the rear of the compressor. There is one valve for the high side and one for the low side.



Retrofitting is the only cost effective option not only is R12 hard to find and expensive but you must have a licence to purchase it. After the repairs are made you would need an A/C shop to recharge the system. Most if not all of R12 is recycled anyways which adds to the cost. Go to the link 96 provided and it will give you the 411 on retrofitting.

As for the thread error I think it know why its happening. I noticed the site started saving the threads in separate html files rather then the old way in a database using php with the old system when a thread was created it was given a sequential number and saved in the sites database. The new system is basically like saving a document you typed in notepad and linking to it.

The forward slash in A/C is confusing the server since it names the html file after the title this is causing problems most likely because there can be no forward slashes in a filename.

I had the same thing happen to my thread just don't use a forward slash / or any other special characters in the title and it should be fine.

 

so if it was the relief valve it would have just let out everything in a big woosh and a cloud of smoke would have came out right? and does this valve open and close or would i need to repace something?


thanks dave

 

Before I got my gauges, I always relied on "seat of the pants" adding of refrigerant. On several occasions I overcharged my system and the excess refrigerant exited via the relief valve. It made a popping noise, and yes there was some vapor; but only some of the refrigerant would vent. I don't think they are designed to evacuate the whole system, only enough to get back close to operating pressure. It would always happen after I picked up some speed, or the engine revs increased when starting from a stop, which makes sense, because the compressor is turning faster thus increasing the pressure. I remedied the situation by putting a thermometer into the vent and venting more refrigerant until the temp came down. The actual venting of 134 through the relief valve apparently did not damage it. I think after you make all the repairs pull a vacuum on the system and see if it holds. I do not know if the relief valves are replaceable or not......anybody else know?

 

I will be replacing the suction and discharge lines today they are attached to the compressor via a manifold where the pressure relief valves are located according to the diagram.

The Ford dealer should have them today I'll check them out when I get the hose and snap some pics.

 

For my pics of the hose, manifold, and the valves go to this thread:

https://www.ford-trucks.com/forums/5...ml#post3875748