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Old 07-14-2018, 02:49 AM   #1
DFW_Motorrad
 
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Default Yet another A/C thread

Hey everyone. I have a 2004 Freightliner (says Dodge on title but okay) 140" high top cargo.
I just bought it and got it running. But now I'm moving up to NY from TX at the end of July. And my A/C is insufficient. When I say insufficient, I mean non-existent.

Here's what I know:
Compressor works. Clutch engages/disengages with the A/C button.
Condenser fan works, and spins the right direction.
Pressures are good. 40 low side, 200-300 high side depending on the condenser fan.
The recirculate flap is broken. I'd have to remove the whole box to fix it, but I'd be willing to if I have to.
Fan speed only works on 1, 3, and 4. Speed 2 just gives me the same as speed 1.
Temperatures are around ambient across all vents.
Cabin air filter is new and installed properly.

Here's what I'm not sure of:
Interior temp sensor might work? Fan spins.
Temp control knob might work? I get heat when I turn it to full hot, but nothing cold when at full cold. I may take it apart again and spray electrical contact cleaner in the potentiometer.

And that's about all I can come up with.
Please help, I don't want to drive in 100+F temperatures with no A/C.

-Ryan

Last edited by DFW_Motorrad; 07-14-2018 at 02:55 AM.
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Old 07-14-2018, 12:43 PM   #2
Midwestdrifter
 
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Default Re: Yet another A/C thread

So, the top center 2 vents are not cold?

What is the temp of the low side line coming from the txv? Cold enough to form condensate?

The first step is a full evac and measured recharge, as improper charge is very hard to diagnose on txv systems with variable compressors.
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2004 T1N | Overland Conversion in Process Completed...For now... | 101,000 118,XXX 137,078 150,000 miles | 140" | High Roof | My Build Thread
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Last edited by Midwestdrifter; 07-14-2018 at 12:49 PM.
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Old 07-14-2018, 12:48 PM   #3
Midwestdrifter
 
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Default Re: Yet another A/C thread

Also, without a known history you could have all manner of air, propane/butane, in the system.
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2004 T1N | Overland Conversion in Process Completed...For now... | 101,000 118,XXX 137,078 150,000 miles | 140" | High Roof | My Build Thread
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Old 07-14-2018, 10:03 PM   #4
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Default Re: Yet another A/C thread

Top 2 vents are ambient. Passenger one might be slightly cooler, but still around 90F air.

The only line that got moderately cold was the bottom line on the passenger side of the txv. I assume this is the one you're referring to. Not cold enough to create condensation on a hot and humid day, but relatively cold to the touch in a hot engine bay. My IR thermometer is at work, so if you need concrete numbers I can do that.

I'll take it to a local A/C shop this week and have them evacuate completely and refill with exactly 1.9 lbs. I only have manifold gauges.
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Old 07-14-2018, 10:26 PM   #5
Midwestdrifter
 
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Default Re: Yet another A/C thread

I would guess stuck txv, or low charge.
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