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  #1  
Old 08-14-2006, 02:43 PM
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Blower fan fuse keep blowing and AC keep cutting out

I have a 86 420sel that keep on blowing the blower fan fuse. I replaced the blower fan motor with a new unit. It does this when the fan is on high. Also, I've been having problem with the AC cutting out. I tracked it to problem with the push button unit. There is no ground signal. Can there be high resistance in the PBU causing the fuse to blow and the AC to work intermittently?


Thanks,

John

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  #2  
Old 08-14-2006, 06:38 PM
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Electrons can do anything
 
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Location: Houston, Texas
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Check the compressor clutch electromagnet. These things short out and draw enough current to blow the fuse. A bad electromagnet will cause both of the symptoms you describe.
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I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
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  #3  
Old 08-16-2006, 04:58 PM
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How do I do this?

I did degrease the clutch and check the gap a while back. What else do I have to do?

John
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  #4  
Old 08-17-2006, 06:35 AM
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Electrons can do anything
 
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I would apply 12 volts to the coil and measure the current. If it is drawing too much, replace it. I think about 3 amps is normal.
__________________
I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
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  #5  
Old 08-17-2006, 10:48 AM
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Which coil are you referring to?

Newbie to MBZ.

Thanks,

John
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  #6  
Old 08-17-2006, 11:16 AM
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Electrons can do anything
 
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,072
There is a wire that connects to the compressor near the pulley. Put an ammeter in series with this connection and measure the current there. The coil I am refering to is underneath the pulley. You cannot see it unless you remove the clutch assembly from the compressor.

__________________
I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
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