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A/C Pressure Switch

  1. Connect A/C pressure gauges to system and start engine. Note pressure readings. If pressures are normal, go to step 2). If pressures are less than normal, check system for leaks. Evacuate and recharge as necessary. If pressures are high, check for system overcharge, overheating or mechanical failure in freon delivery system.
  2. Using an ohmmeter, check continuity between pressure switch terminals. Continuity should be present on both high and low switches (if equipped with both). If continuity is not present, check switch terminal connectors. If terminal connectors are okay, replace A/C pressure switch. For wiring schematics, see mini-schematics in A/C CLUTCH under MISCELLANEOUS ECM CONTROLS in this article.
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