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Topic: No power to the dash ac compressor... Fuse??? (Read 894 times) previous topic - next topic

No power to the dash ac compressor... Fuse???

Doing a quick check around the coach today I noticed that the clutch on the ac compressor was not turning. The fan on the condenser comes on when I turn the switch on but there is no power to the clutch. Is there a fuse somewhere, the fuse panels under the bed do not have one for this. My neighbor at the storage place with an SOB said he has a big fuse panel with 50 or so fuses. do I have one I don't know about yet?? Where does the power to the compressor clutch come from? I ran 12v power to the wire to the clutch and it engaged,  so I think no power on the wire is the problem just don't know where to start...

Keith
The selected media item is not currently available.Keith & Jo
2003 U320T 4025 PBBS Designer series
Build 6203    Cummins 500hp
2000 U320 4010 WTFE / Build 5762 —Sold—
Motorcade #18070   
Pasadena, Texas
2015 Jeep Wrangler Sahara-Sunset Orange pearl coat
Don't argue with a fool, people watching might not be able to tell the difference.

Re: No power to the dash ac compressor... Fuse???

Reply #1 –
Check the relay and fuse located on same panel as the boost solenoid. If it's the same as the 1997 there will be two relay's. One for the condenser fan and one for the clutch.

Bob
The selected media item is not currently available.Bob & Faith Rozek
1997 U320 40'
Xtreme Remodel
2010 Scion XD

Re: No power to the dash ac compressor... Fuse???

Reply #2 –
There is also a 15amp breaker on the same panel that feeds the clutch.  It is a self resetting one "BUT" due to it's location failure is always a possibility. The breaker that feeds the condenser fan should be a 20amp. and is located in the same area.

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: No power to the dash ac compressor... Fuse???

Reply #3 –
So if I'm thinking right the boost solenoid is located under the bed by the isolator??


Keith
The selected media item is not currently available.Keith & Jo
2003 U320T 4025 PBBS Designer series
Build 6203    Cummins 500hp
2000 U320 4010 WTFE / Build 5762 —Sold—
Motorcade #18070   
Pasadena, Texas
2015 Jeep Wrangler Sahara-Sunset Orange pearl coat
Don't argue with a fool, people watching might not be able to tell the difference.

Re: No power to the dash ac compressor... Fuse???

Reply #4 –
Don't forget about the pressure switches, they all should have an high pressure switch somewhere on the compressor discharge line and some systems also will have a low pressure switch.
Steve
2001 U320 40' IF$ Build #5798
2018 Jeep Grand Cherokee Trailhawk Toad
2015 GMC Duramax HD2500 Toad
2014 Polaris RZR 1000
Litchfield Park, AZ- Soon to be Paulden, AZ

Re: No power to the dash ac compressor... Fuse???

Reply #5 –
Also, if it's low on freon, the clutch might not kick on.
The selected media item is not currently available.
Lynn & Marilyn Sickel
Tollville, AR
1997  U320  40'
2021 Chevrolet Silverado pickup
Motorcader  17257

Re: No power to the dash ac compressor... Fuse???

Reply #6 –
I ran a 12v temp wire to the clutch wire and the clutch engaged so I'm thinking the Freon is ok and the pressure switch is satisfied. Just need to find where the hot wire to the clutch comes from


Keith
The selected media item is not currently available.Keith & Jo
2003 U320T 4025 PBBS Designer series
Build 6203    Cummins 500hp
2000 U320 4010 WTFE / Build 5762 —Sold—
Motorcade #18070   
Pasadena, Texas
2015 Jeep Wrangler Sahara-Sunset Orange pearl coat
Don't argue with a fool, people watching might not be able to tell the difference.

Re: No power to the dash ac compressor... Fuse???

Reply #7 –
Quote from: hdff –
So if I'm thinking right the boost solenoid is located under the bed by the isolator??

Keith,
On some coaches that is the location for that panel that has the isolator, boost solenoid, relays and breakers(for the A/C) and aux. start solenoid.

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: No power to the dash ac compressor... Fuse???

Reply #8 –
Connecting 12v directly to the compressor clutch bypasses the pressure switches. You need to check the refrigerant pressures to know if you are low. If you run the compressor for a minute you can feel the high and low pressure lines to see if the get hot and cold. If you can find the low pressure switch (mine is on the receiver/drier next to the condensor) you can short around it with a jumper to see if the clutch engages. If yes, then you are either low on refrigerant or the switch is bad. You can also check to see if you have 12v through the switch with a volt meter. If no voltage present you will need to work backwards to the power supply to if you have a bad connection, broken wire, etc.
My bet is that you are low on refrigerant.

Good luck!
Steve
Steve & Sandy
2003 U320 4220 WCDS, build#6160
Motorcade #17794
USMC '67-'71

Re: No power to the dash ac compressor... Fuse???

Reply #9 –
I had the same symptoms as you. Mine was low on Freon. You have to manually engage the clutch so it will take the Freon.
Rick & Deborah Webster
2002 3610 U320 #5964
2014 Jeep Wrangler Sahara JKU- 'Copperhead'
Richland Chambers Lake, East Texas