Question about 1999 Ford Expedition
Air conditioning stopped working step for trouble shooting
There are several ideas on test gauges for A/C pressure. You need to find out if you have any Freon pressure in your system. Low pressure will activate a cut-off switch to protect the compressor from seizing.
If you look at the passengers side of the Firewall, under the wiring bundle attached to the Firewall, the low pressure fitting is on the black oblong tank. The pressure cut-off switch is on a A/C line leaving this tank.
You can by-pass the cut-off switch with a wire loop to see if the compressor engages and what the running pressure is for the system. You can work with low pressure better than some other problems.
There are Freon cans with sealant and conditioner which can fix minor problems. Once you get enough pressure to deactivate the cut-off switch the Freon should be pulled into the system.
Have windows open, A/C on Max, and then use the gauge to keep from overfilling the system.
Posted on Oct 16, 2013
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Posted on Jan 02, 2017
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