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Old 06-26-2006, 07:17   #6 (permalink)
miesk5
I used to know this stuff
 
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Join Date: Mar 2001
Location: or
Posts: 210
Re: 1990 Bronco II - no air con

ok; standing at front bumper; the clutch is in front of the ac compressor; look at this pic;
http://autorepair.about.com/library/...s/bl370lib.htm

clutch as 3 large bolts around circumfrence and 3 smaller bolts in inner section.
The air conditioning compressor has an electromagnetic clutch that can engage or disengage the compressor pulley. The compressor pulley always turns when the engine is running, but the compressor only runs when the pulley is engaged to the compressor driving shaft. When this system is activated, current runs through the electromagnetic coil. The current attracts it to the armature plate. The strong magnetic pull draws the armature plate against the side of the turning pulley. This locks the pulley and the armature plate together; the armature plate drives the compressor. When the system is deactivated, and current stops running through the electromagnetic coil, flat springs pull the armature plate away from the pulley. The magnetic coil does not turn since its magnetism is transmitted through the pulley to the armature. The armature plate and hub assembly are fastened to the compressor drive shaft. When it's not driving the compressor, the clutch pulley turns on a double row of ball bearings.

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