You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!
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
Vent Temp 58F
So I added 134a until I got the following:
Speed 1700 rpm
Low 30 psi
High 275 psi
Vent temp 55F
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.
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.
2013 Explorer Limited
87 Ranger, XLT
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.