How can the pressure cycling switch and high-pressure cut-off switch be replaced?

The pressure cycling switch, detecting low refrigerant line pressure at 21-27 psi, turns the A/C compressor off and on again at 42 psi. If pressure exceeds 455-495 psi, the high-pressure cut-off switch near the compressor turns it off. To replace, disconnect the electrical connector and unscrew the switch from the Schrader valve. No need to discharge the A/C system. Lubricate the switch O-ring with clean refrigerant oil, screw the new switch until hand tight, then secure it. Reconnect the electrical connector.

Genuine Mercury Mountaineer HVAC Pressure Switch

Air Pressure Switch

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14 HVAC Pressure Switches found

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Mercury Mountaineer Switch - Air Condition System - Vacuum
Part Number: 6F9Z-19D594-AA
- Replaces: 6L2Z-19D594-BA, F6CZ-19D594-CB
$77.04 MSRP: $153.09
You Save: $76.05 (50%)

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Fits the following Vehicles:
2006-2010 Mercury Mountaineer | 6 Cyl 4.0L SOHC EFI, 8 Cyl 4.6L | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Mercury Mountaineer Valve Assembly
Part Number: F7RZ-19D701-BA
- Other Name: Valve Assy
$5.02 MSRP: $7.80
You Save: $2.78 (36%)

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Fits the following Vehicles:
2000-2010 Mercury Mountaineer | 6 Cyl 4.0L, 6 Cyl 4.0L SOHC EFI, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 5.0L | 4AT 4R70W, 5AT 5R55E, 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Mercury Mountaineer Valve Assembly - Pressure Relief
Part Number: F65Z-19D644-AA
- Other Name: Valve Assy - Pressure Relief
- Replaces: F65Z-19D644-A1A
$35.68 MSRP: $56.91
You Save: $21.23 (38%)

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Fits the following Vehicles:
2006-2010 Mercury Mountaineer | 6 Cyl 4.0L SOHC EFI, 8 Cyl 4.6L | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
1998-2001 Mercury Mountaineer | 8 Cyl 5.0L | 4AT 4R70W, 5AT 5R55E
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Mercury Mountaineer Switch - Air Condit.System - Vacuum
Part Number: F5TZ-19D594-AA
- Replaced by: 6L3Z-19D594-A
$46.74 MSRP: $74.55
You Save: $27.81 (38%)

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Fits the following Vehicles:
1997-2001 Mercury Mountaineer | 8 Cyl 5.0L | 4AT 4R70W, 5AT 5R55E
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Mercury Mountaineer Valve Assembly - Pressure Relief
Part Number: F3DZ-19D644-A
- Other Name: Valve Assy - Pressure Relief
$23.37 MSRP: $37.27
You Save: $13.90 (38%)

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Fits the following Vehicles:
1997-2000 Mercury Mountaineer | 8 Cyl 5.0L | 4AT 4R70W, 5AT 5R55E
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Mercury Mountaineer Switch - Air Condit.System - Vacuum
Part Number: 6L2Z-19D594-AA
- Other Name: High Pressure Cut-Off Switch, Pressure Switch
- Replaces: F3AZ-19D594-C
$35.68 MSRP: $56.91
You Save: $21.23 (38%)

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Fits the following Vehicles:
2007-2010 Mercury Mountaineer | 8 Cyl 4.6L | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
2002-2005 Mercury Mountaineer | 6 Cyl 4.0L SOHC EFI, 8 Cyl 4.6L Romeo SOHC EFI | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Mercury Mountaineer Valve Assembly
Part Number: 4L3Z-19D701-A
- Other Name: Valve Assy
- Replaces: F8RZ-19D701-AA, 4R3Z-19D701-AA
$6.39 MSRP: $9.93
You Save: $3.54 (36%)

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More Info
Fits the following Vehicles:
1998-2010 Mercury Mountaineer | 6 Cyl 4.0L, 6 Cyl 4.0L SOHC EFI, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 5.0L | 4AT 4R70W, 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 5AT 5R55E, 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Mercury Mountaineer Valve Assembly
Part Number: E69Z-19D701-A
- Other Name: Valve Assy
$4.68 MSRP: $7.27
You Save: $2.59 (36%)

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More Info
Fits the following Vehicles:
1997-2010 Mercury Mountaineer | 6 Cyl 4.0L, 6 Cyl 4.0L SOHC EFI, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 5.0L | 4AT 4R70W, 5AT 5R55E, 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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View related parts
Mercury Mountaineer Valve Assembly
Part Number: F8RZ-19D701-AA
- Other Name: Valve Assy
- Replaced by: 4L3Z-19D701-A
$6.39 MSRP: $9.93
You Save: $3.54 (36%)

Add to Cart
More Info
Fits the following Vehicles:
1998-2001 Mercury Mountaineer | 6 Cyl 4.0L, 8 Cyl 5.0L | 4AT 4R70W, 5AT 5R55E
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Mercury Mountaineer Switch - Air Condit.System - Vacuum
Part Number: F3AZ-19D594-C
- Replaced by: 6L2Z-19D594-AA
$35.68 MSRP: $56.91
You Save: $21.23 (38%)

Add to Cart
More Info
Fits the following Vehicles:
2002-2005 Mercury Mountaineer | 6 Cyl 4.0L SOHC EFI, 8 Cyl 4.6L Romeo SOHC EFI | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Mercury Mountaineer Valve Assembly
Part Number: F4XY-19D701-A
- Other Name: Valve Assy; Core Assembly, Expansion Valve
$11.41 MSRP: $17.73
You Save: $6.32 (36%)

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More Info
Fits the following Vehicles:
1997 Mercury Mountaineer | 8 Cyl 5.0L | 4AT 4R70W
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Mercury Mountaineer Valve Assembly - Pressure Relief
Part Number: 1L2Z-19D644-AA
- Other Name: Valve Assy - Pressure Relief
- Manufacturer Note: Valve Assy - Air Conditioning Compressor Pressure Relief
More Info
Fits the following Vehicles:
2002-2005 Mercury Mountaineer | 6 Cyl 4.0L SOHC EFI, 8 Cyl 4.6L Romeo SOHC EFI | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
Less Info
View related parts
Mercury Mountaineer Switch - Air Condit.System - Vacuum
Part Number: F6RZ-19E561-AA
More Info
Fits the following Vehicles:
2002-2010 Mercury Mountaineer | 6 Cyl 4.0L SOHC EFI, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
Less Info
View related parts
Mercury Mountaineer Switch - Air Condit.System - Vacuum
Part Number: F5VY-19E561-A
More Info
Fits the following Vehicles:
1997-2001 Mercury Mountaineer | 6 Cyl 4.0L, 8 Cyl 5.0L | 4AT 4R70W, 5AT 5R55E
Less Info

Mercury Mountaineer HVAC Pressure Switch Parts Questions & Answers

Valve Assembly
E69Z-19D701-A
Q: How can the pressure cycling switch and high-pressure cut-off switch be replaced?
A: The pressure cycling switch, detecting low refrigerant line pressure at 21-27 psi, turns the A/C Compressor off and on again at 42 psi. If pressure exceeds 455-495 psi, the high-pressure cut-off switch near the compressor turns it off. To replace, disconnect the electrical connector and unscrew the switch from the Schrader valve. No need to discharge the A/C system. Lubricate the switch O-ring with clean refrigerant oil, screw the new switch until hand tight, then secure it. Reconnect the electrical connector.