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Question

1998 Ford Mustang AC not working. It's too hot in Seattle today. AC clutch is not activating. Could it be the low presssure switch? Where is the low pressure switch located and how do I bypass it? I checked AC the fuse and it is OK. I have a can of refrigerant with a pressure guage attached and have located the low pressure valve with the black top. Pressure on the system is about 15 to 20 lbs.

Submitted: 116 days and 4 hours ago.
Category: Ford
Value: $9
Status: AWAITING CUSTOMER ACTION

Answer

This should help. The switch once unplugged can be bypassed with a jumper or paperclip. It is located in the suction line prior to the low side port.

A/C Cycling Switch
Notes
Close 276-324 kPa (40-47 psi)
Open 152-193 kPa (22-28 psi)

A/C Cycling Switch
Notes

REMOVAL

  1. Disconnect the wire harness connector from the A/C cycling switch.
  2. Unscrew the A/C cycling switch from the top of the suction accumulator/drier.

INSTALLATION

  1. Lubricate the O-ring seal on the suction accumulator/drier nipple with clean Motorcraft YN-12b refrigerant oil or equivalent meeting Ford specification WSH-M1C231-B.
  2. Screw the A/C cycling switch on the suction accumulator/drier nipple and hand-tighten.
  3. Connect the wire connector to the A/C cycling switch.
  4. Check the A/C cycling switch installation for refrigerant leaks.
  5. Check the system for proper operation.

Picture
Expert: EMRSR
Pos. Feedback: 99.2 %
Accepts: 
Answered: 7/30/2009

Master Certified Service Manager

20 years with Ford, Master Certified

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