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  #1  
Old 09-07-2014, 02:15 PM
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560Sl blower pops fuses

My '89 560SL blower will run for a minute or two and then blow the 16A fuse (#6).
Doesn't matter where the blower switch is set, high, low, auto, same result.
The blower will cycle through various speeds on auto before it blows the fuse.
What should I be looking at first?
Disconnect the blower?
Can I check any Vdrops?

As an aside, the compressor is not engaging.
Could it be related?

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1999 E320 (gave to daughter) 250K
1994 F150 (may be the end of its road) 240K
1989 560 SL (Reassembly after paint job) 160K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (still running strong with an upgraded cam) 349K
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Old 09-14-2014, 11:38 PM
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Update; The fuse has stopped blowing out. Don't know why but not complaining. Taking car back to the indie who recharged the A/C to check it out and make sure he didn't forget something to cause the compressor not to engage.
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1999 E320 (gave to daughter) 250K
1994 F150 (may be the end of its road) 240K
1989 560 SL (Reassembly after paint job) 160K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (still running strong with an upgraded cam) 349K
1986 242Ti (deceased)
1968 GT500KR (under restoration)
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  #3  
Old 09-22-2014, 01:18 PM
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Fuse

Let me know what you find out as my 560SL has done the same thing!
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Old 09-27-2014, 10:06 PM
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Well, it stopped blowing fuses.
Don't know why.
It seems as if, the hotter the ambient temp., the more likely the fuse will blow.
The HOT weather has broken and temps are now in the 70s-80s.
Is there a temp sensor in the CKT that might be a culprit?
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1999 E320 (gave to daughter) 250K
1994 F150 (may be the end of its road) 240K
1989 560 SL (Reassembly after paint job) 160K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (still running strong with an upgraded cam) 349K
1986 242Ti (deceased)
1968 GT500KR (under restoration)
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  #5  
Old 09-28-2014, 12:54 AM
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You need to run a Amp draw test on the system consumers like the blower fan and the aux coolant pump. I use a DVOM and a low amp probe.

Start up amperage can be a little higher than fuse rating and then should drop to around half rated fuse rating. What is factory fuse rating for your a/c system?


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