93 a/c RECHARGE NOT WORKING
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Junior Member
Joined: Aug 2003
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93 a/c RECHARGE NOT WORKING
Hey gang,
I am new to this forum, but I hope someone can help.
This past weekend, I redid the a/c on my 93 F150. The orifice tube had become clogged with some rubber type material. I was planning on doing a 134a conversion, but a clerk at an autoparts store told me of an r-12 replacement called Freeze 12. It is suppose to be r-12 with an atom removed to make it environment friendly. So I go some.
I pulled the system apart and flushed it out. I then replaced the dryer and orifice tube and o-rings. I put the system back together and pulled a vacuum (for about 15 minutes. Was this long enough?) I then charged the system with Ester Oil and the Freeze 12. I am not getting any cooling. I am using a set of 134a gauges (No one locally had R-12/134 gauges). With an outside temp of 75 F, the gauges are reading 73 PSI on the low and 80 PSI on the high. I had found a conversion chart to convert 134 a r12 pressures, and this is reading about right ( I guess).
I am at a loss. I can grab the evaporator tube coming out just below the orifice tube, and I can feel movement when I rev the engine. It will then turn slightly cool at high RPM.
If anyone has an idea, I would greatly appreciate the help.
Thanks,
Mike
I am new to this forum, but I hope someone can help.
This past weekend, I redid the a/c on my 93 F150. The orifice tube had become clogged with some rubber type material. I was planning on doing a 134a conversion, but a clerk at an autoparts store told me of an r-12 replacement called Freeze 12. It is suppose to be r-12 with an atom removed to make it environment friendly. So I go some.
I pulled the system apart and flushed it out. I then replaced the dryer and orifice tube and o-rings. I put the system back together and pulled a vacuum (for about 15 minutes. Was this long enough?) I then charged the system with Ester Oil and the Freeze 12. I am not getting any cooling. I am using a set of 134a gauges (No one locally had R-12/134 gauges). With an outside temp of 75 F, the gauges are reading 73 PSI on the low and 80 PSI on the high. I had found a conversion chart to convert 134 a r12 pressures, and this is reading about right ( I guess).
I am at a loss. I can grab the evaporator tube coming out just below the orifice tube, and I can feel movement when I rev the engine. It will then turn slightly cool at high RPM.
If anyone has an idea, I would greatly appreciate the help.
Thanks,
Mike
Senior Member
Joined: Jul 2002
Posts: 485
Likes: 0
From: Central Florida
Hello and Welcome! 
There could be a lot of things that went wrong on you, and you may be able to use 134A as well. The attached thread has some good info.
R12 vs 134A
You may also have some success asking around in the pre-1997 forum. Those guys have been keeping older models alive and kicking for years.
Good Luck!
There could be a lot of things that went wrong on you, and you may be able to use 134A as well. The attached thread has some good info.
R12 vs 134A
You may also have some success asking around in the pre-1997 forum. Those guys have been keeping older models alive and kicking for years.
Good Luck!
Senior Member
Joined: Feb 2003
Posts: 755
Likes: 0
From: So. California
Not really familar with r12 substitutes but those pressures sound like bad compressor to me. At 75 degs. you should still be able to pull 30-40 psi on the low side and 160 + on the high side. With almost no difference in pressures low to high it sounds like the compressor is bad .