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04 E150 - ac/defrost blows fuse, blower motor works

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Old May 25, 2026 | 06:08 PM
  #1  
unbrokenchain's Avatar
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04 E150 - ac/defrost blows fuse, blower motor works

My van blows the #13 fuse on the panel by the parking brake instantly whenever I select a/c or defrost. When I replace the fuse, blower motor works on all speeds, heat works, just something about engaging the compressor blows that fuse. I've unplugged the harness at the compressor and didn't see anything melted or abnormal. Any thoughts?
 
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Old May 25, 2026 | 11:54 PM
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Does the fuse blow with the A/C clutch disconnected? You could disconnect the Cycling Pressure Switch or the High Pressure Switch to isolate the issue. See wiring diagrams below...




 
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Old May 26, 2026 | 08:38 AM
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^^ What he asked^^ does the fuse blow if you disconnect the field coil?
 
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Old May 26, 2026 | 10:49 PM
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Thanks y'all, I will try this once it stops raining. The a/c I can live without, but I had a pretty hairy drive home down some long and steep switchbacks in a heavy downpour the other day, it sure would be nice to have the defrost working.
 
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