Automotive Air Conditioning Information Forum (Archives)

Scout3 on Sat September 18, 2010 5:19 PM

Year: 1997
Make: Ford
Model: Explorer
Engine Size: 4.0
Refrigerant Type: 134
Ambient Temp: 90
Pressure Low: 30
Pressure High: 275
Country of Origin: United States

Hi and thanks for the help. Bought a 1997 Ford Explorer for my so from a friend of mine. I knew the A/C did not work when I bought it. My friend had already replaced everything except the evaporator with all new parts. I found the blend door broken and the valve stem on the low side leaking. I repaired the blend door and changed the valve stem. I vacuumed down the system for two hours and leak checked for another hour. All checked good. I decided to go ahead and charge the system. I have some questions on freon quantity for this vehicle. A tag on the hood says 1lb 14 ozs. I have a book that says 1.38 lbs, and I found a post on this forum that said 22 ozs. I have a case of 12 oz. cans. It took two 12 oz cans to get the compressor to stop cycling at idle. At 2000rpm it would start cycling again and air temps at the vent were about 80 degrees. It was about 90 degree outside and I had a house fan blowing into the radiator. I decide to add another 12oz can. It took about 2/3rds of that can and that stopped it from cycling at 2000rpm. I estimate that I have about 33ozs in it now, that seems like a lot.
At idle my High side is 250 psi and low is 50 psi. At 2000rpm my high side is 275psi and my low is 30 psi. At 2000rpm vent temp is 48 degrees, at idle temps creep back up to 58 degrees. Is this working correctly at idle. Thanks for any advice.

Ed

Scout3 on Sat September 18, 2010 10:25 PM

Edited: Sat September 18, 2010 at 10:27 PM by Scout3

Scout3 on Sat September 18, 2010 10:26 PM

any advice?

TRB on Sat September 18, 2010 11:13 PM

A/C SYSTEM SPECIFICATIONS
Application Specification
Compressor Type Ford FS-10 10-Cyl.
Compressor Belt Tension (1)
Compressor Oil Capacity (2)
System Oil Capacity (3) 7.0 ozs.
Refrigerant (R-134a) Capacity 30 ozs.
System Operating Pressures (4)
High Side 160-250 psi (11.2-17.6 kg/cm2 )
Low Side 20-50 psi (1.4-3.5 kg/cm2 )
(1) An automatic drive belt tensioner is used to maintain belt tension.
(2) If amount of oil drained from old A/C compressor is between 3-5 ounces (85-142 ml), pour same amount plus one ounce (30 ml) of clean PAG compressor oil into new A/C compressor. If amount of oil that was removed from old A/C compressor is greater than 5 ounces (142 ml), pour same amount drained of clean PAG compressor oil into new A/C compressor. If amount of oil that was removed from old A/C compressor is less than 3 ounces (85 ml), pour 3 ounces (85 ml) of clean PAG compressor oil into new A/C compressor.
(3) Use PAG YN-12b Refrigerant Oil.
(4) Approximate pressures with ambient temp. of 80°F (27°C).



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Scout3 on Sun September 19, 2010 10:57 AM

Thanks for all the help. It looks like I over charged by a few ounces. I am going to let it ride for awhile to verify I have no leaks. It is comfortable just not as cold as it could be.

Ed