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Any AC gurus here?       #: 1318
 Moderated by: NoPower, Mike69, MaDMaXX
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 Posted: Mon Oct 8th, 2018 08:49 pm
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JAMMAN

Owns A Torsen


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 Just evacuated, oiled and charged the latest ranger with a professional grade machine to the specs on the tag under the hood.

Gets cold, but still cycles.

Have proved it is the low pressure switch by shorting it out, stays on.

When pump kicks on at idle, high pressure goes to 100PSI low pressure starts dropping. When the low pressure gets to 25 the clutch kicks out until the low pressure gets to about 35 where it kicks back on again. With the switch shorted out the clutch stays on, the high pressure goes just barely over 100 and the low pressure stabilizes at about 20PSI.

What is that low pressure supposed to be at, because if it is supposed to be below 25 then the switch is bad. If it is supposed to stay higher than 25 then something else is wrong.



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00 XLT 2WD RCSB 5.0 swap Gherkin (now a parts truck)
00 XLT 4WD XCSB 4.0 G2 (For Sale)
00 XLT 4WD RCSB 3.GO! Jalapeño (will keep till death)
99 XL 4WD RCSB 3.0 PJ (Plain Jane) For Sale
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 Posted: Mon Oct 8th, 2018 08:58 pm
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black06xlt
salvage auto dismantler


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 I ran into this on a peterbilt one time and found the cycling switch was bad



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2006 ranger xlt ext cab 4x4 4.0 auto
1992 ranger xlt reg cab 2wd 2.3 5 spd (SOLD)
1996 explorer Eddie Bauer 5.0 AWD sold
1995 ranger splash reg cab 2wd 2.3 5 spd
2001 Explorer Sport Trac 4.0 4x4 auto
1998 Ranger XLT ext cab 4x4 4.0 auto
2000 Ranger XLT ext cab 4x4 4.0 5 speed
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 Posted: Mon Oct 8th, 2018 09:00 pm
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JAMMAN

Owns A Torsen


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 I meant 200. I need to pay attention.



____________________
Truth sounds like hate for those who hate truth.
00 XLT 2WD RCSB 5.0 swap Gherkin (now a parts truck)
00 XLT 4WD XCSB 4.0 G2 (For Sale)
00 XLT 4WD RCSB 3.GO! Jalapeño (will keep till death)
99 XL 4WD RCSB 3.0 PJ (Plain Jane) For Sale
00 XLT 2WD RC Steppie 2.5 Dee Dee For Sale
01 XLT 2WD RC Steppie 3.0 auto SIlver

NOT ALL Amazon Green Metallic
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 Posted: Mon Oct 8th, 2018 10:17 pm
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410customs

Idahome


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 Did you change the orifice tube? When they get clogged it can cause this.



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I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks
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 Posted: Mon Oct 8th, 2018 10:27 pm
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JAMMAN

Owns A Torsen


Joined: Mon Sep 18th, 2017
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Name: Jim
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 A clogged orifice tube would probably build too much high pressure wouldn't it?

I'm going to hook it back up tomorrow, the guy that helped me is a GM guy and could care less about Fords. I think it is wrong and under charged, the static pressure was below ambient temperature and for how hot it was in the shop the running high should have been at least 225 and it barely saw 200. I think he has it under charged.

The low did seem too low but I thought he knew what he was doing and did not look at a chart before I had him hook it up.

I know how to use our fancy machine too now.



____________________
Truth sounds like hate for those who hate truth.
00 XLT 2WD RCSB 5.0 swap Gherkin (now a parts truck)
00 XLT 4WD XCSB 4.0 G2 (For Sale)
00 XLT 4WD RCSB 3.GO! Jalapeño (will keep till death)
99 XL 4WD RCSB 3.0 PJ (Plain Jane) For Sale
00 XLT 2WD RC Steppie 2.5 Dee Dee For Sale
01 XLT 2WD RC Steppie 3.0 auto SIlver

NOT ALL Amazon Green Metallic
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 Posted: Tue Oct 9th, 2018 01:59 am
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black06xlt
salvage auto dismantler


Joined: Sat Nov 25th, 2017
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 I believe your machine is a robinaire? You should just have to type in the weight of freon needed hit start and walk away. It should pull vacuum and do a leak test before it starts to charge. But yes a clogged orifice tube or even a clogged dryer will cause that. Even being a gm guy a/c systems pretty much work the same with the same principles



____________________
2006 ranger xlt ext cab 4x4 4.0 auto
1992 ranger xlt reg cab 2wd 2.3 5 spd (SOLD)
1996 explorer Eddie Bauer 5.0 AWD sold
1995 ranger splash reg cab 2wd 2.3 5 spd
2001 Explorer Sport Trac 4.0 4x4 auto
1998 Ranger XLT ext cab 4x4 4.0 auto
2000 Ranger XLT ext cab 4x4 4.0 5 speed
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 Posted: Tue Oct 9th, 2018 01:42 pm
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410customs

Idahome


Joined: Wed May 2nd, 2018
Location: Panhandle Idaho, USA
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Name: Jamie
Occupation: Elevator Design Worlds Tallest Buildings
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 He didn't even look at the label?
The sticker is how you know how much oil and refrigerant to install and they are always pretty damn close

Indeed sounds under charged.
If you were to bypass the low pressure switch and run the AC I bet the canister will freeze up = undercharged.
Add some more R134 and see if it stops cycling.

My fancy machine was like $149 on Amazon works great (pump and gauges)
I always follow the stickers and it always works.
I could not believe the condition of the orrofice tubes in some of my trucks, so much crap on them I was amazed it was working at all prior to my re-do

Our Excursion takes 68 oz of R134 or some crap....my van was similar...expensive!!



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I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks
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