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Old 05-20-2023, 08:55 AM   #1
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A/ C low side location for recharging freon, on 2004 Tiffin Allegro Workhorse 8.1?

Need help on locating my A/C low side to recharge A/C system on 2004/2005 Tiffin Allegro class A motorhome. Thank you!
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Old 05-20-2023, 11:14 AM   #2
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On my 2001 it is accessed from the front engine hatch. It is on your left, at the bottom of the black heater box, on the aluminum hose end along with the low side switch. It should have a black or gray cap on it.
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Old 05-20-2023, 12:20 PM   #3
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On my 2003 bus, it is located on the outside (left side as looking aft at the front generator compartment) of the heater box. I can not see it, can only feel it. Kind of a hassle connecting a hose to it.
Don & Carolyn Bingham
2003 Allegro Bus Freightliner 40DP ISL 400
2019 GMC Acadia, Blue Ox
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Old 05-23-2023, 12:38 AM   #4
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Unless I'm confused with High port, On my National Rv W22 8.1 2003 it easy reachable under the doghouse cover (under the left front cover). It's on one line from the compressor.
2003 National RV Dolphin LX 6355
2002 Rexhall Aerbus 3550BSL 35' Class A Ford F53
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Old 05-23-2023, 05:19 AM   #5
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It often depends on whose air coil box the coach builder used.

Workhorse usually shipped the chassis with compressor, discharge line to condensor, receiver/drier with “one-time” quick connect (this allowed a possible pre-charged, chassis A/C system), and suction line with a “king valve” for connection to the block TXV.
Coach builder provided flexible liquid line from receiver/drier, evaporator (in air box with heater core), block TXV, and evaporator.

The suction port on our ‘02 was on the “king valve”.

FWIW - last year I realized the block TXV was installed upside down on the evaporator, thus feeding liquid refrigerant to the bottom/air entering side of the evaporator first. That’s backwards (you want the warmest air hitting the warmest refrigerant, or the coldest air hitting the coldest refrigerant).

I replaced the TXV with a new one, and while doing so, removed the “king valve” as it no longer served its intended purpose (and quite frankly, hadn’t since the coach and chassis were first built).

The “king valve” had the suction port on it - I just added an inline suction port into the flexible suction line as it headed back to the compressor, along with a port for the low suction pressure switch.

Pictures upon request.
‘91 Ultrastar Champion‘02 Georgie Boy Landau 8.1l Workhorse
‘03 Jeep Wrangler TJ 2018 Jeep Wrangler JK toad
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allegro, cat, charging, location, tiffin, workhorse

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