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(Abbreviation)

  • Definition:
  • WAC stands for Wide Open Throttle A/C Cutoff Relay or Wide Open Throttle A/C Cutout Relay.
  • It refers to a relay or switch mechanism in automotive air conditioning systems that interrupts or cuts off the compressor operation when the throttle is fully open or at wide-open throttle (WOT).
  • Function:
  • The WAC relay helps prevent compressor overload or damage by disengaging the air conditioning compressor when the throttle is fully open.
  • During wide-open throttle conditions, such as rapid acceleration or heavy load, the engine requires maximum power, and compressor operation may be temporarily suspended to prioritize engine performance.
  • Operation:
  • When the throttle position sensor or other throttle-related sensors detect wide-open throttle conditions, the WAC relay sends a signal to disengage the air conditioning compressor clutch.
  • This interruption in compressor operation reduces the load on the engine and helps maintain optimal performance during high-demand situations.
  • Benefits:
  • Prevents engine power loss: By temporarily suspending compressor operation during wide-open throttle conditions, the WAC relay helps prevent engine power loss and ensures maximum performance.
  • Protects compressor: Avoids compressor overload or damage by disengaging the compressor clutch when the engine requires maximum power.
  • Automotive Applications:
  • WAC relays are commonly found in vehicles equipped with air conditioning systems, particularly those with electronically controlled climate control systems.
  • They are integrated into the vehicle’s engine management system to coordinate compressor operation with throttle position and engine load.
  • Safety Note:
  • While the WAC relay helps optimize engine performance during high-demand situations, it may temporarily affect cabin comfort by suspending air conditioning operation.
  • Drivers should be aware of this feature and understand its implications for air conditioning performance during wide-open throttle conditions.

The Wide Open Throttle A/C Cutoff Relay (WAC) plays a crucial role in coordinating air conditioning compressor operation with engine throttle conditions to ensure optimal engine performance and compressor protection.

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