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clutch cycling switch failure

jdr37 on Tue June 24, 2008 1:56 PM User is offline

Year: 1993
Make: mazda
Model: protege
Engine Size: 1.8 L
Refrigerant Type: r134a

My ac has been working fine, but now the clutch won't engage. When the ac is "on" the lead to the clutch cycling switch is 12+ volts but the switch is in the open position so no current to the clutch. The switch looks much like a water temp sending unit and is screwed to the bottom of the sight glass. Is there any reason why the switch should be open when the ac hasn't been on for 24 hours? Can this switch be replaced without draining the system (simply screwed out and back in, much like a remote propane take sending unit), or is it actually in the gas line?Thanks'
jdr37

mk378 on Tue June 24, 2008 2:36 PM User is offline

This is a TXV system; the switch does not control cycling in normal operation. It is for protection against abnormally low or high pressure. Most likely a leak has developed and all the refrigerant has leaked out. Measure the system static pressure. If it is less than 50 psi, the switch will open.

If the switch really is bad, the refrigerant must be removed first to replace it. Once unscrewed the line will be open.

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