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2007+ Expedition & Navigator 2007, 2008, 2009 and 2010 Ford Expedition and Lincoln Navigator

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Old 07-20-2012, 12:06 AM
efxengr efxengr is offline
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A/C, fan clutch? my numbers are.....

07 Expedition w/aux rear air, 172,000 mi, well maintained.

92 deg days in south Florida I'm noticing A/C feels warm at idle but not bad under speed so I took some readings:

Engine off: 90 psi low & high, Amb 84 deg (Gauge Manifold is Mastercool brass)

doors open, a/c on max cool, fan high:
Speed 1500 rpm
Amb. 84F
Low 20psi
High 212psi
Vent Temp 58F

So I added 134a until I got the following:
Speed 1700 rpm
Amb 84F
Low 30 psi
High 275 psi
Vent temp 55F

@idle:
Low 40 psi
High 250 psi
Vent temp 59F

While @ idle or slightly higher I heard the fan clutch kick in (and wind noise), immediately the head pressure dropped to about 190-200psi, low dropped to 30 psi, and vent temp started dropping to 50F and below (48F) but didnt stay more than a few minutes.

Engine off, new high/low pressure is 96F w/ amb of 83F.

At ilde it almost looks slightly over charged. Shouldnt the fan clutch remain on at idle? How can I check or is it better to just replace? Not sure what cycles it, engine coolant temp? refrigerant head pressure? is there a way to test? IT was spinning the whole time while taking readings but there was a noticable change when it kicked in.


Thanks for any thoughts.
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Old 07-20-2012, 06:03 AM
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critterf1 critterf1 is offline
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Controlled by a thermostat built into the clutch. What engine?
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Old 07-20-2012, 06:16 AM
chuck s chuck s is offline
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'07 Expeditions are all 5.4 V8.

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Old 07-20-2012, 06:25 AM
efxengr efxengr is offline
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Engine is 5.4L all stock, all original except for one new plug coil, idler pulley, minor misc. A/C control panel was replaced under warranty at 35,000 mi.
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Old 07-22-2012, 07:01 AM
slc10844 slc10844 is offline
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Try using a fan to push air accross the condenser to check the pressures. I think the new models use electonically controled fans. My 08 F150 had a pair of wires going to the fan drive. The clutch fan may be doing what it is designed to do.
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Old 07-22-2012, 07:01 AM
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