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Discussion Starter · #1 ·
Hi guys I have 93 LX 1.9L. I have been having som a/c issues where it's not cooling and compressor locked up. I took it to a shop and that didn't go well, that "mechanic" was an idiot he apparently had no clue or wanted to short change me. I eventually had to redo the whole system myself except the evaporator. So all new parts are on the car. So now I want to know what is the running high pressure and low pressure. Presently I'm doing about 300 hi and about 35 on the low. It cools very well at idling and normal traffic but on the highway at times it goes warm then cool, not a constant cool. The compressor cycles normally to me but could be a issue. I had a good vacuum and put in 28oz of freon. Now for this car how much freon is needed? And the working range pressures. Conversations welcomed, thanks I want to know where I may have gone wrong.
 

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1993 All Engines R12 34.08 Mineral 7.75

From:
http://techchoiceparts.com/refrigerant-and-oil-capacities/ford

Assuming that it's correct since IIRC a 1993 should use R12, and you did not specify refrigerant type, you would be 6oz low of R12. There should be a sticker under the hood specifying refrigerant type and capacity. I am not sure that this is causing your problem, but if this is the case it's easy enough to fix so do that first.

However the internet suggests that it might be an air gap issue on the clutch. You can probably verify this. With the car in park and A/C on, watch the compressor and see if the clutch disengages if you have someone rev the engine. Or just measure the gap and compare it to the specifications. I would think that it would be fine on a new compressor, but you never know, and for all I know you put in a crap rebuilt.
 

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Discussion Starter · #3 ·
It's converted to r-134a. There's no sticker, so I went on the 94 freon specs.
The compressor is new not a rebuilt, as the other parts except the evaporator.
So as it's converted to r-134a does it take the same quantity as the r12? Or it goes with the 94 r-134a specs?
Thanks for helping.
 

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Nope, not the same quantity as r12. So sounds like you are good on quantity. I think i recall r134 is about 80% of r12 capacity-wise.
 

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When you say all new parts, you replaced all the A/C components (except evaporator) with parts intended for a newer Escort that uses r134a, right?
 

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Nope, not the same quantity as r12. So sounds like you are good on quantity. I think i recall r134 is about 80% of r12 capacity-wise.


So 34 ounces is 2.125lbs.
1.64lbs is 26.24 ounces, which is probably close enough to the 28oz that you have.
 

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Discussion Starter · #8 ·
When you say all new parts, you replaced all the A/C components (except evaporator) with parts intended for a newer Escort that uses r134a, right?
The condenser is for the 93 to 96 escort
Drier same, compressor same(93 to 96)
 

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Discussion Starter · #9 ·
Everything seems to be correct, but the highway driving issue is what has me baffled. I recently replaced the orafice figuring there was a blockage from the numbers but I'm getting the same from a new orafice and it's still getting warm ever so often thus the reach out for some insight. Hope this widens the scope of my issue.
 

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By any chance are you able to hit the WOT cutout? I dont know if it is possible that it could be bad and come on sporadically.
 

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Discussion Starter · #11 ·
By any chance are you hitting the WOT cutout?
That has crossed my mind but i don't believe that is what it is, because driving down the road normally about 50 to 60 mph it gets warm for a bit then cools then after a while it goes warm again. Driving home i was wondering if the cut out switch was set too high, as it came on the drier so i assume it is set for this car. So for diagnostic purposes i backed the adjusting screw one turn. Then ill check it while driving home tomorrow and see what happens. I know the compressor may be on a bit longer but if that works any better that may be the problem, like i said ,Diagnostic purposes if no change ill turn it back one turn.
 

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Honestly I am not sure how the cutout works. I thought it was a relay, if it is I dont know if the relay removes power or might ground. But my thought is maybe there could be a questionable connection causing an intermittent cutout.
It is a really interesting situation in that you have it at lower speeds but faster causes problems, a real headscratcher.
Especially since less taken systems usually show improvement with speed.
 

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The condenser is for the 93 to 96 escort
Drier same, compressor same(93 to 96)
The internet suggests that the pressure switches need to be different because R134a operates at higher pressures. Have you looked into this? The part numbers on Rock Auto are different for a 1993 vs newer years as well.
 

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Discussion Starter · #15 ·
That may be the issue as the sensor i may have gotten would be for R12 and not R134-A. Any how i ran it with the setting and it was better, it didnt go warm as it was doing, but we had rain so i didnt get the hot sunny situation i was expecting. Hopefully tomorrow i get to put it to the real test. Ill update when i get in on my findings.
 

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Discussion Starter · #16 ·
The internet suggests that the pressure switches need to be different because R134a operates at higher pressures. Have you looked into this? The part numbers on Rock Auto are different for a 1993 vs newer years as well.
Thus i backed the adjustment screw one turn.
 

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Discussion Starter · #18 ·
Update: The backing of the screw one turn has apparently has some effect on my issue. The cool then warm is either negligible or not there. But i think it has put more pressure on the compressor thus adding a noticeable strain on the engine, as you know these engines are not high HP like whats out there now. So i advanced the screw half of a turn and it worked better than original but it took longer to warm,but it happened, not for long tho and the strain on the engine went away.So i'm going to back it a quarter turn then monitor it. Ill update after i run it.
 

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Discussion Starter · #20 ·
It's supposed to be like driving while dragging a boat anchor in these cars.
LOL yep that's the downside, but they are very good engines except for a few flaws, and that accessory drag is one of them.
 
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