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#1
07-30-2015, 11:33 AM
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hotwiring AC compressor
My AC compressor is not kicking on, so I may have let too much gas leak out before recharging. Last time it was recharged was at least three plus years ago. In order to recharge the system I recall the compressor had to kick in to accept the gas.
Can anyone refresh my memory on how to hot wire the compressor so it will bypass the low pressure switch. Thanks. 
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#2
07-30-2015, 11:42 AM
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I read where a man with a w140 did it,and it shorted out something bad.
__________________
1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt
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#4
07-30-2015, 12:22 PM
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Any chance you have a pic of the jump?
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#5
07-30-2015, 12:49 PM
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The switch will be on the receiver-drier.
Without the information of what car you are dealing with it is impossible to give you a location.
__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.” ― Brian P. Cleary, You Oughta Know By Now
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#7
07-30-2015, 01:21 PM
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The low pressure switch normally will kick in when you charge and start the compressor. If you want to be sure then jump the switches at the recv/drier. You can jump both if you don't know which one is the low pressure. The high pressure switch just turn on the aux fan at slow speed. It does not matter.
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.  W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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