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Old 06-07-2021, 05:19 PM   #1
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Low pressure switch location-XCS chassis

Left Maryland 2 weeks ago and the cab AC stopped working. While camping in Tennessee I added some freon, AC worked until I drove coach 5 days latter.

The compressor kicked on and AC control lights were lite on the display.

Now I can't get the display light on or the compressor to start.

Does anyone know where the low pressure switch is located? Looked for hours and can't find it. I intend to jump the low pressure switch to see if the compressor kicks in.

2008 Fleetwood Expedition/XCS chassis
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Old 06-07-2021, 05:47 PM   #2
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OK ; do you have any indication what type of dash air conditioner unit is installed in your coach ?
Evans/Tempcon ? Denso ?

The pressure switch in my Evans system is beyond the dash control in the wiring , so no dash control would mean no power ( fuse blown ) to supply power to the dash control head .

Big problem with dash A/C parts and wiring , is that some parts are supplied with the chassis and the coach builder supplies the rest.
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Old 06-07-2021, 05:50 PM   #3
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Skip426, the dryer is Evans so I think that's what the system is.
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Old 06-07-2021, 06:01 PM   #4
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Ok , I don't know how many years these wiring schematic for Evans are good for , but they might help; page 3 should be closest . Also a break down of chassis and coach builder parts and a picture of my pressure switch , right next to the dryer , hidden in the harness on my XC .
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Old 06-07-2021, 06:03 PM   #5
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BTW : My old Evans system is easily identified by this casting in the plastic evaporator cover.
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Old 06-07-2021, 06:09 PM   #6
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My low pressure switch is not located on dryer like the picture. it's raining here in Hot Springs Arkansas.
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Old 06-07-2021, 06:21 PM   #7
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Quote:
Originally Posted by hayward3411 View Post
My low pressure switch is not located on dryer like the picture. it's raining here in Hot Springs Arkansas.
So you're dealing with the storm I had here on the BC coast yesterday , the amount of rain I had , I was sure we'd drained those clouds .

Somewhere between the outlet of the condenser and the side of the evaporator box " H valve " is the usual location. Liquid line .

I have seen them hard to find .

EDIT: I spoke too soon , my coastal storm from yesterday is busy dumping snow in the Rockies around Banff and Jaspar, hasn't got to you; YET.
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Old 06-07-2021, 07:07 PM   #8
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Thanks Skip426, I will look tomorrow morning again.
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Old 06-08-2021, 09:16 AM   #9
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I crawled under again in the rain.....no luck finding the AC low pressure valve.
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Old 06-15-2021, 03:51 PM   #10
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Update

Cab AC fixed now. Looks like compressor clutch locked up (burned up) causing high pressure destroying the dryer also, Clutch and dryer replaced. Now the fun begins....no signal to compressor (light on AC control not coming on). Many hours of electrical troubleshooting and a second in line fuse located behind the fuse panels under dash. Why 2 fusses????

All's OK with AC now.
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Old 06-15-2021, 05:46 PM   #11
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Quote:
Originally Posted by hayward3411 View Post
. Many hours of electrical troubleshooting and a second in line fuse located behind the fuse panels under dash. Why 2 fusses????

All's OK with AC now.
Thanks for wrapping up your post , glad you're keeping cool .

Two fuses , because the right hand doesn't know what the left hand did.

If one fuse was in Freightliner fuse box then the dash installed didn't know what circuit he was tied into and added a fuse to be safe .
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Old 06-16-2021, 05:23 AM   #12
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Sad thing is that neither fuse was in a fuse box, both in-line.
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