Engine Size: 2.3
Refrigerant Type: r134
I recently purchased a compressor from ackits and it came with 7 oz of pag46 oil. I will be refilling system with r134, i spilled ~ 2 oz of oil from the compressor while inspecting it. I purchased 7 or 8 oz bottle of the BVA 100 from ackits and I am wondering what oil to use. should i just add a few oz of BVA to the dryer or empty compressor and use only the BVA, or just not use the BVA and make up the 2 oz with pag46?
I want to do this right so i dont have to fool with the ac system in the future.
When I did mine, my compressor came filled with the total oil capacity of the system. I completely drained my compressor and then filled it with new oil, at about 3/4 of the system's oil capacity. I distributed the other 1/4 of the oil in the evaporator and drier.
Thats a fine idea im guessing but will remaining pag46 mix ok with the BVA 100? Whats the easiest way to drain oil just turn upside down and spin compressor?
Drain as much as you can and use the BVA Auto 100. A little PAG and BVA will work fine together. But i always like to have one type of one in a system.
The PAG that comes already in a compressor should not be used because it might have gotten wet with water from the air. If you get all the PAG out you would have the option to revert to R-12 later without changing the oil. That would require obtaining more BVA so you could flush the compressor with a quantity of it. If you're going to use only R-134a, do what TRB said.
IM not going back to R12, too pricey and environmentally sensitive. Ill just drain pag and fill with BVA.
Thanks for all the info, hopefully get some cold air blowing tonight.
Okay got everything installed and hooked up. I emptied pag and filled with BVA 100 ~ 7 oz. I then added 24 oz of r134. compressor came on and stayed on at idle.
Pressure readings 44 low side / 290 high side.
I dont have a tach but i revved it to what i thought would be 2k and pressures were 48 low side and quivered around 300 high side.
Vent temps at idle windows down max ac in garage with door up were 60 degrees.
Drove the truck around it was getting to around 44 degrees.
Outside temp is ~ 82
How am i looking? I was going to put in more refrigerant but stopped at 2 for now.
This is going to be an issue of two things. One is the fan clutch working correctly. Two trying to make a R12 system work with R134a. Take your garden hose and lightly spray the condenser with a mist of water while the a/c is running. If the temps and pressure drop you may need a new Motorcraft fan clutch. Especially if you shut the engine off and it spins freely for a couple seconds. If you have the best air flow possible. You then can adjust the refrigerant level to help with the pressures. But having too little refrigerant can cause a compressor failure as the refrigerant is needed to carry the oil through out the system.
Can somebody post some guidelines on what high and low pressures i should be shooting / looking for? I saw on another post 2.2 rule im guessing thats amb * 2.2 so for my last post would = 180. IS that what my high pressure side should be at idle? What should low side pressure look like?
As close to R12 as possible on all capacities and pressures.
Refrigerant (R-12) Capacity 32-36 oz.
System Oil Capacity
FX-15 7 oz.
FS-6 10 oz.
System Operating Pressures
High Side 160-250 psi (11-18 kg/cm2 )
Low Side 22-50 psi (2-4 kg/cm2 )
OKay so if im usingr134 do i use 85% of the r12 36 oz which would be ~ 30-31 oz? Thanks for the pressure readings, gonna go home for lunch and put on gauges and spray condenser and see what happens. If the high pressure side goes down then i need better cooling im guessing. You recommended a Motorcraft clutch earlier, could i use a different brand? I havnt seen anywhere to get Motorcraft except from dealer.
There is no perfect formula when converting and using the original R12 components. Only thing I can suggest is use close to the OEM specifications as possible. I have not had any luck using an aftermarket fan clutch. This is one item only use OEM.
Well sprayed condenser today with water and pressures instantly dropped. The condenser is new for the record.
Pressures at idle were 40/275
after water on condenser 28/175
SO replace fan clutch asap and i should be good to go?
The cooling is fine as far as inside the cab i just dont want to damage any ac components b/c they are all new.
Thx again for the info TRB!
One more thought, whats the upside or downside of flex fans that eliminate the fan clutch?
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