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Old 08-11-2006, 11:52 PM
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Join Date: Oct 2005
Posts: 10
a/c melts fuse only on auto/high speed fan

1st-My 1992 300d melted the 30a fuse.Driving along and just went out.The a/c was on and the fan setting was set to Auto.I wired in a 30a auto reset breaker and the system performs fine on low speed without tripping the breaker.However, if I set the fan to auto/high it will trip within 3 minutes.
2nd The a/c still cools well set at 65 but will not cool if control temp is set above 68-70
Has anyone had either of these problems. Any help is appreciated.
Thanks Gregg

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Old 08-11-2006, 11:55 PM
dkveuro's Avatar
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Join Date: Jun 2003
Location: Here an' there.
Posts: 2,548
Check the amp's draw. On high, you'll find that draw is very close to fuse rating.
Bearing begining to sieze and/or brushes worn.
Sounds like new blower fan needed.
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Old 08-12-2006, 08:30 AM
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Location: Houston, Texas
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Check the current to the compressor clutch. I have seen these things do a partial short and draw a lot of current. I think the normal current draw is between 3-4 amps.
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Old 08-12-2006, 07:00 PM
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If it's easy to get to the blower motor, check if there's axial play in the main shaft. The bearings could be worn causing undue load.

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