Mercury E3EZ-19D701-AA Valve Assembly

This switch is used only on 2008 and earlier models with accumulators. Later models with receiver/driers don't use a pressure cycling switch. The pressure cycling switch is located on top of the accumulator and detects low refrigerant line pressure at 22 to 28 psi. It switches the A/C system off and then back on again at 40 to 47 psi. If the pressure increases over 550 psi, the pressure cut-off switch shuts the system off. To replace the pressure cycling switch, unplug the electrical connector, unscrew the switch from the accumulator, lubricate the switch o-ring with clean refrigerant oil, screw the new switch onto the accumulator threads until hand tight, and then tighten it securely. Finally, reconnect the electrical connector.

Later models with receiver/driers do not use a pressure cycling switch.

The pressure cycling switch detects low refrigerant line pressure at 21 to 23 psi, switches the A/C compressor off, and then back on again at 42 psi. If the pressure increases over 435 to 475 psi, the high-pressure cut-off switch will turn the A/C compressor off.

Yes, transducers are used on V6 engine models only.

If the pressure increases too high, the pressure cut-off switch located in the high-pressure side of the system shuts the system off.

CONFIRMED