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#4558571 - 10/29/17 05:16 PM F150 AC question
another Todd Offline


Registered: 05/15/06
Posts: 2205
Loc: Lakeside CA
I think I have a plugging up orifice tube on my friends 03 F150 truck, what do you think? Symptoms: clutch cycles about every 1.5 seconds, pressure on low side 25 at kick out 40-45 at kick in, high side kick in about 125-140 kick out at 175 (75-80 ambient). High pressure line from the orifice tube to firewall covered in ice, low pressure line out of evap. is warm, slightly cooler than ambient. With heater hose clamped off I get 60 degrees at low fan speed, center vent, recirc. Un-clamp heater hose and temp slowly rises to 70 degrees (about 10 minutes). During the short time compressor is on the low side drops and the high side rises much quicker than I would expect, hence I suspect the orifice tube is mostly plugged. What do you think?
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#4558604 - 10/29/17 05:51 PM Re: F150 AC question [Re: another Todd]
JamesBond Offline


Registered: 12/13/06
Posts: 843
Loc: midwest
I'm no expert but the pressures seem low according to the charts I saw. Are you checking these pressures at idle? I'd recheck at 2000 rpm and see what you get, then I'd probably add some refrigerant.

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#4558626 - 10/29/17 06:11 PM Re: F150 AC question [Re: another Todd]
Colt45ws Offline


Registered: 08/15/06
Posts: 9640
Loc: Central Washington
Agree, it seems like its low to me.
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#4558659 - 10/29/17 06:53 PM Re: F150 AC question [Re: another Todd]
another Todd Offline


Registered: 05/15/06
Posts: 2205
Loc: Lakeside CA
I assume your are referring to the high side? The pressure is climbing fast when it cuts out, I suspect it would go a fair amount above that if the compressor did not cycle off every 1.5 seconds.


Edited by another Todd (10/29/17 07:07 PM)
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#4558670 - 10/29/17 07:02 PM Re: F150 AC question [Re: another Todd]
JamesBond Offline


Registered: 12/13/06
Posts: 843
Loc: midwest
I was referring to the low side pressure. The compressor might be shutting off because the low side is getting too low tripping the low pressure safety switch. I think it's supposed to go up quickly but that doesn't mean that if the compressor stayed on that it would keep going up.

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#4558678 - 10/29/17 07:10 PM Re: F150 AC question [Re: another Todd]
another Todd Offline


Registered: 05/15/06
Posts: 2205
Loc: Lakeside CA
I will certainly try adding some refrigerant before I replace the o-tube, and I am pretty certain it was hitting the low pressure cut out, but the high side rose so fast during the 1.5 seconds I assumed there was a blockage.


Edited by another Todd (10/29/17 07:11 PM)
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#4558739 - 10/29/17 08:13 PM Re: F150 AC question [Re: another Todd]
WyrTwister Offline


Registered: 01/13/13
Posts: 1513
Loc: Texas
Has the system recently been open & exposed to air ? Has it recently had a compressor replaced ? Perhaps for a catastrophic failure ?

The 2 things that come to my mind , to stop up an O-Tube would be ice or debris from a compressor coming apart internally .

Are you getting proper air flow through the condenser coil ? Are the radiator cooling fan / fans working OK ?

I too would like to know if it is cycling on low pressure or high pressure ? I am guessing low pressure .

I think , were it mine , I also would try , very careful , adding a little refrigerant in the low side . I would probably charge with vapor , not liquid refrigerant .

Best of luck to you , :-)
Wyr
God bless
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#4558743 - 10/29/17 08:17 PM Re: F150 AC question [Re: another Todd]
mk378 Offline


Registered: 09/27/15
Posts: 1418
Loc: USA
Charge by weight then evaluate performance. When properly charged you may find the high side is way up due to condenser issues (fan clutch, dirt, missing shrouds).

A clog would cause the low side to go down until the switch trips, then stay there for a long time. Orifice tubes rarely clog. If you do have the opportunity with the system empty, definitely pull it and check for debris on the screens.

This system is showing the usual signs of low charge. If it was low, look for the leak.


Edited by mk378 (10/29/17 08:18 PM)

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#4558753 - 10/29/17 08:33 PM Re: F150 AC question [Re: another Todd]
Chris142 Offline


Registered: 06/05/03
Posts: 16819
Loc: Deplorable in apple valley, ca
R134a is weird stuff. You can be pounds low and still have somewhat normal pressures.
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#4559072 - 10/30/17 08:45 AM Re: F150 AC question [Re: another Todd]
another Todd Offline


Registered: 05/15/06
Posts: 2205
Loc: Lakeside CA
WYR, no the system has not been opened.
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#4578108 - 11/18/17 03:12 PM Re: F150 AC question [Re: another Todd]
another Todd Offline


Registered: 05/15/06
Posts: 2205
Loc: Lakeside CA
Turns out, as some have suggested, it was just super low on refrigerant. Had enough to kick on the compressor, but not enough to cool. I added the necessary amount and all is well. Thanks for the help.
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#4578223 - 11/18/17 06:20 PM Re: F150 AC question [Re: another Todd]
researcher Online   content


Registered: 04/12/12
Posts: 256
Loc: Michigan
good deal! Always like to hear a good ending to the story! thumbsup

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