Ac Not working

Asked by May 26, 2014 at 09:35 PM about the 1999 Ford F-250 4 Dr XL 4WD Extended Cab SB

Question type: Maintenance & Repair

Ac Cluch not in gaugeing freon ok fuse ok

4 Answers

113,295

Typically the clutch not engaging is due to low freon level. Or faulty low level switch.

2 of 2 people found this helpful.
9,765

Agreed,,,thinking is a good thing ; )

3 of 3 people found this helpful.
98,565

You stated that the Freon is good, so I am going to assume you had someone hot charge the A/C system with the correct amount of Freon, correct? Check the voltage to the A/C clutch coil with the system turned on, if you have voltage then the clutch coil is bad, if no voltage then you either have a wiring problem, defective pressure switch, main A/C switch or A/C relay.

1 of 1 people found this helpful.
25,315

It's most likely that they pressed a schrader valve, heard a hiss and think it has plenty of R134a. You could always jumper the Low-side switch with a Paperclip to see if the Compressor engages. You should already have a Manifold Gauge Set hooked up so you can see what the Compressor is actually doing and if the system is actually charged. Don't run it too long on the Paperclip - low Freon also means that oil isn't being distributed through the system and could cause a Compressor problem. The Air Gap between the Compressor Clutch and the Pulley should be between about 0.020" and 0.030"

3 of 3 people found this helpful.

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