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Old 06-18-2013, 03:27 PM   #1
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Dash AC blowing fuse

Last summer the dash fan stopped working and I found that it had blown the AC fuse. I replaced it and it worked the rest of the summer. I stored it for the winter and when I went to pick it up I noticed fluid under the AC compressor. It was green dye. I drove it home and when I went to turn on the the fan all was working but when I went to go turn on the AC the fan quit blowing again. I reached down and felt the blower motor and it was hot, so I thought it was a bad blower motor. I replaced the fan motor and tried AC again and it blew fuse again. I then thought since the compressor was leaking fluid I would replace the compressor since it must be a bad coil on compressor. Well it still blows the fuse even with new compressor. I'm thinking either a bad pressure switch or thermostat. Does anyone have a good diagram to t/s so I can isolate the short or any other suggestions on what it could be?

Thanks!

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Old 06-18-2013, 03:31 PM   #2
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Sounds like some rodents might have got in there and chewed some wires possibly
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Old 06-18-2013, 03:47 PM   #3
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Quote:
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Sounds like some rodents might have got in there and chewed some wires possibly
I would have thought that also if it weren't for the fuse blowing last fall before storage, plus I don't have any issues with mice where it's stored. My thought is something was starting to fail and now it has failed...but what.
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Old 06-18-2013, 06:24 PM   #4
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New compressors have been known to fail. It took 3 Sandan brand compressors before Ford got my AC fixed with 1 month left on chassis warranty on my first motor home. BTW also had same brand compressor on my Freightliner chassis and it failed (leaked oil just like the Ford) 1 month before expiration of the 3-year chassis warranty. I am a lucky guy.
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Old 06-18-2013, 10:51 PM   #5
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unplug blower motor and turn the system "On"....if fuse blows...its the blower motor, if not move on....do the same for the compressor....if when both are unplugged and fuse still blows....unplug each item in the system....if everything is unplugged and fuse still blows...start checking wiring
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Old 06-19-2013, 05:43 AM   #6
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unplug blower motor and turn the system "On"....if fuse blows...its the blower motor, if not move on....do the same for the compressor....if when both are unplugged and fuse still blows....unplug each item in the system....if everything is unplugged and fuse still blows...start checking wiring
I think you mean to unplug the blower and if the fuse does not blow it is the blower.
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Old 06-19-2013, 08:33 AM   #7
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yes, typo on my part
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Old 06-19-2013, 06:23 PM   #8
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Originally Posted by sc3283 View Post
unplug blower motor and turn the system "On"....if fuse blows...its the blower motor, if not move on....do the same for the compressor....if when both are unplugged and fuse still blows....unplug each item in the system....if everything is unplugged and fuse still blows...start checking wiring
Results:
1) Unplugged AC compressor and turned on AC-fail
2) Unplugged blower - fail
3) Unplug resistor pack-fail
4) Unplug pressure switch-good
5) Unplug thermostat with pressure switch on and it was fine.

It seems like something with pressure switch or thermostat that is on the heater core is shorting out or something with that. Does anyone have any schematics that I can get the proper ohms on those two?

Thanks
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Old 06-19-2013, 07:57 PM   #9
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Sounds like you have a wire that has rubbed thru somewhere. Check the comp. wire they like to rub and short out. I hate working on wiring. Jim
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Old 06-19-2013, 10:24 PM   #10
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Fallguy, the pressure switch and T stat are just switches...they allow 12v positive to travel through them. It sure appears you have a wiring situation somewhere between frt and back. I doubt my 96 wiring diagrams would do you any good...my coach doesn't have all the electronics yours does.

The T stat and pressure switch interrupt the 12 volt positive going to them as it travels rearward to the compressor.

Ohm reading with pressure on the pressure switch should be zero or very close to zero between the 2 terminals. Same reading for the T stat.

Does your coach have an electric fan on the condenser? If so....unplug it and retest...the fan motor could possibly be bad.
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