A/C capacities?
Thread Starter
|
Freshman User
Joined: Apr 2005
Posts: 43
Likes: 0
A/C capacities?
I have a 95 3.0 2wd automatic that has had no A/C since I aquired the truck. I threw a can of 134a in and it was at 30lbs and cooling fine but when I shut the truck off I hear a hiss at the accumulator, no problem, I'd planed to change it and thats just what I did, along with all orings in the system. After installation, I added 2 cans to 35lbs and it still hisses at the accumulator when I shut off the truck and it's now cycling on and off from low pressure.
A friend brought over some guages and a vaccum pump but I'm a little over my head. I know that the system should be vacumed down to 29in mercury but I don't know how much 134a to add and I'm not sure now if my system is leaking or if that hiss is gas being converted back to liquid. Anyway, I really need to know the capacity of the system and any other info and links to understanding the mystery of A/C.
Chaiyz
A friend brought over some guages and a vaccum pump but I'm a little over my head. I know that the system should be vacumed down to 29in mercury but I don't know how much 134a to add and I'm not sure now if my system is leaking or if that hiss is gas being converted back to liquid. Anyway, I really need to know the capacity of the system and any other info and links to understanding the mystery of A/C.
Chaiyz
Hotshot
Joined: May 2004
Posts: 12,170
Likes: 5
From: The hills of No. Calif.
Most of what I learned about A/C I got from this site:
http://www.ackits.com/
Good prices on parts, and a lot of guys on the forum who know thier stuff. Good luck, -TD
http://www.ackits.com/
Good prices on parts, and a lot of guys on the forum who know thier stuff. Good luck, -TD
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
The specs for the '95 A/C system are as follows:
A/C Cycling Switch:
- Close Maximum 52 psi
- Open MInimum 23 psi
A/C Compressor Pressure Relief Valve:
- 450 psi
Refrigerant Capacity:
- Explorer 26 oz.
- Ranger 22 oz.
Here's a little bit on how the Accumulator works:
The suction accumulator/drier is mounted to the A/C accumulator bracket to the right of the vehicle centerline. The inlet tube of the accumulator/drier attaches directly to the A/C evaporator core outlet tube, and the outlet tube attaches to the A/C manifold and tube.
After entering the inlet of the accumulator/drier, the heavier oil-laden refrigerant contacts an internally mounted dome (which serves as an umbrella) and drips down onto the bottom of the canister.
- A small diameter oil bleed hole, in the bottom of the vapor return tube, allows the accumulated heavier liquid refrigerant and oil mixture to re-enter the compressor suction line at a controlled rate.
- As the heavier mixture passes through the small diameter liquid bleed hole, it has a second chance to vaporize and recirculate through the A/C compressor without causing compressor damage due to slugging.
- A fine mesh screened filter fits tightly around the bottom of the vapor return tube to filter out refrigerant system contaminant particles.
- A desiccant bag is mounted inside the canister to absorb any moisture which may be in the refrigerant system.
- A fitting located on the top of the suction accumulator/drier is used to attach the A/C cycling switch. A long-travel Schrader-type valve stem core is installed in the fitting so that the A/C cycling switch can be removed without discharging the A/C system.
A/C Cycling Switch:
- Close Maximum 52 psi
- Open MInimum 23 psi
A/C Compressor Pressure Relief Valve:
- 450 psi
Refrigerant Capacity:
- Explorer 26 oz.
- Ranger 22 oz.
Here's a little bit on how the Accumulator works:
The suction accumulator/drier is mounted to the A/C accumulator bracket to the right of the vehicle centerline. The inlet tube of the accumulator/drier attaches directly to the A/C evaporator core outlet tube, and the outlet tube attaches to the A/C manifold and tube.
After entering the inlet of the accumulator/drier, the heavier oil-laden refrigerant contacts an internally mounted dome (which serves as an umbrella) and drips down onto the bottom of the canister.
- A small diameter oil bleed hole, in the bottom of the vapor return tube, allows the accumulated heavier liquid refrigerant and oil mixture to re-enter the compressor suction line at a controlled rate.
- As the heavier mixture passes through the small diameter liquid bleed hole, it has a second chance to vaporize and recirculate through the A/C compressor without causing compressor damage due to slugging.
- A fine mesh screened filter fits tightly around the bottom of the vapor return tube to filter out refrigerant system contaminant particles.
- A desiccant bag is mounted inside the canister to absorb any moisture which may be in the refrigerant system.
- A fitting located on the top of the suction accumulator/drier is used to attach the A/C cycling switch. A long-travel Schrader-type valve stem core is installed in the fitting so that the A/C cycling switch can be removed without discharging the A/C system.
