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You can refill the AC 2001 Lincoln navigator is located on the accumulator or receiver-drier.
Usually at the top of the accumulator/drier at the passenger side firewall
because its colder than the external temperatue there fore it condensates
lOOK NEAR THE PASSENGER SIDE FIREWALL PERHAPS NEAR DRIER/ACCUMULATOR
On all GM products it is almost always on the accumulator / receiver drier.
Fully charged? Bad pressure switch on accumulator/drier? Blow fuse?
Probably on top of the drier accumulator at the passesnger rear firewall
Its on the Receiver Drier/Accumulator. I found a drawing of it on the site listed below.
It comes off the accumulator/drier and looks like a air pressure valve only about 2 times bigger.
Look for pressure switch on top of accumulator/drier normally at the passenger side firewall - jump this switch with paper clip or ? That should pull clutch in
Check fuses May need a refrigerant charge Jump ressure switch at the top of the accumulator/drier to see if compressor starts
Next to AC accumulator/drier, which is in the engine bay in front of the firewall. When looking from the front, it is on the left side of the car, an aluminum cylinder approx. 4 inches in diameter.