Question about 1999 Ford Expedition
on the tube between the firewall and the a/c compressor. On some Fords the low pressure port is on the dryer (aluminium cylinder). Good news is the low pressure and high pressure port are different sizes. You cannot mess it up.
Remember the flow for the a/c system is :
1. From the compressor a high pressure (HP) gas goes to the condenser in front of the radiator.
2. From the condenser a HP liquid goes to an expansion device (orifice tube or expansion valve)
3. From expansion device the low pressure gas enters the firewall to the evaporator.
4. From evaporator the low pressure liquid/gas mixture goes through the dryer back to the compressor suction
Posted on May 29, 2010
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Posted on Jan 02, 2017
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