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Old September 18th, 2011, 01:18 AM
Rufus's Avatar
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1994 NAS D90 ST #1118
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Location: South Shore, MASS
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ac recharge issue

ac recharge issue - I don't have not enough pressure in the system to turn the compressor on. how do I bypass to start the compressor? Thanks for the help
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Old September 18th, 2011, 09:19 AM
navydevildoc's Avatar
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Neill Thornton
1984 D90 300 Tdi / 1965 Series IIA
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You need to disconnect the trinary switch connector down by the dryer and short out the pins for the low and high pressure. I only have wiring diagrams for a 97 so I don't know which of the pins are what... but if you get it right the compressor will come on regardless.

Another option is to "hot wire" the compressor clutch, it's a single wire that you put 12 volts on.

But the real question is why do you need to in the first place? The reason there is a low pressure switch is because the compressor is lubricated by refrigerant. If there isn't enough in the system you will likely damage it.
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