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1997 4.0 AC problems


lman

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Joined
Jan 2, 2015
Messages
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Location
Vancouver WA
Vehicle Year
1997
Make / Model
Ford
Engine Size
4.0
Transmission
Manual
I just got finished installing an AC system out of a 99 ranger in my 97, but I can't get it to work correctly. Im pretty sure it is a wiring problem, but I dont really know where to start looking for it. When I turn on the AC switch on the dash, the pump doesn't turn on, but the idle goes up and then the WOT relay starts clicking on and off. However, if I have the high pressure switch unplugged, it goes into high idle and the WOT relay does not click on. It acts the same way if I bridge the pins on the high and low pressure sensors. The clutch does activate if I jump it. The positive wire running to the pump is supplying power, but the negative isnt working. If I remove the WOT relay and try to jump it to activate the AC clutch, it blows fuse #18.
Basically all I know is that the clutch is good, and WOT relay is good, and both of the pressure switches are good. Im out of ideas.
 


lman

New Member
Joined
Jan 2, 2015
Messages
9
Reaction score
0
Points
1
Location
Vancouver WA
Vehicle Year
1997
Make / Model
Ford
Engine Size
4.0
Transmission
Manual
figured this out a long time ago, but might be helpful to someone. what the problem was was that the wiring harness I got from an explorer had a thicker gauge of wire running to the pump. the extra resistance from the thick wire caused it to not activate the pump. replace it with thinner wire and its worked perfect.
 

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