What is the purpose of the A/C Orifice Tube and how to replace a plugged fixed orifice tube in an air conditioning system on Mercury Grand Marquis?

Restriction of the flow of liquid refrigerant into the evaporator core is done by the fixed orifice tube assembly. The evaporator temperature is controlled by a pressure-operated electric switch. In cases where high pressure is extremely high and the low pressure is nearly a vacuum, then the fixed orifice tube is blocked and it needs to be replaced. To take it out, disconnect the liquid line connection, lubricate the O-rings, use a special tool to extract the tube, and cap an open line.

Genuine Mercury Grand Marquis A/C Orifice Tube

A/C Hose

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3 A/C Orifice Tubes found

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Mercury Grand Marquis Restrictor
Part Number: F5DZ-19D990-AB
$5.40 MSRP: $8.75
You Save: $3.35 (39%)
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Product Specifications
- Other Name: Orifice, Orifice Tube, Refrigerant Hose Connector
- Replaces: F5DZ-19D990-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1993-2011 Mercury Grand Marquis | 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI | 4-Speed Automatic Transmission 4R75E Livonia, 4AT, 4AT 4R70W, 4AT AODE, Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Mercury Grand Marquis Seal Special
Part Number: F5XZ-19D990-AA
$5.20 MSRP: $8.42
You Save: $3.22 (39%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Seal - Special
- Replaced by: F5XZ-19D990-AB
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1991-1995 Mercury Grand Marquis | 8 Cyl 4.6L, 8 Cyl 5.0L | 4AT, 4AT AOD, 4AT AODE
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Mercury Grand Marquis Air Conditioner
Part Number: F5DZ-19D990-AA
$6.29 MSRP: $8.75
You Save: $2.46 (29%)
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Product Specifications
- Manufacturer Note: Orifice - A/C, w/ Orange inlet frame color, Orifice I.D. = 0.0560" to 0.0590"
- Replaced by: F5DZ-19D990-AB
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1993-1994 Mercury Grand Marquis | 8 Cyl 4.6L | 4AT, 4AT AODE

Mercury Grand Marquis A/C Orifice Tube

The Mercury Grand Marquis A/C Orifice Tube controls the refrigerant flow between the high-pressure side of the discharge and the low-pressure side of the suction side to allow heat to be absorbed in the evaporator, keeping the cabin air cool. In contrast to the adjustable expansion valve, the A/C Orifice Tube features a fixed bore. Thus, its flow rate alone dictates how much liquid reaches the evaporator. The compressor just cycles on and off to match demand. The tube also contains a fine mesh that captures metal shavings and dirt. As the screen becomes clogged, the driver first notes weak cooling at idle. Then, the gauges start to act erratically. Finally, the evaporator ices over as the refrigerant no longer properly changes state. The A/C Orifice Tube's condition is all that matters, as every production year has the same simple fixed-bore layout and the Mercury Grand Marquis never switched to other styles. If you ignore a fouled A/C Orifice Tube, the high-side pressure will rise and damage the compressor. Regular inspection of a healthy A/C Orifice Tube keeps the Mercury Grand Marquis system steady and cold, ensuring that the long-running Mercury Grand Marquis reputation for comfort is alive and well.

We provide a wide range of Mercury Grand Marquis A/C Orifice Tube at the optimal prices. If you need Mercury Grand Marquis A/C Orifice Tube, you can shop with confidence on our website. All our OEM parts come with a manufacturer's warranty and are delivered to your doorstep with a fast delivery service.

Mercury Grand Marquis A/C Orifice Tube Parts Questions & Experts Answers

Restrictor
F5DZ-19D990-AB
Q: What is the purpose of the A/C Orifice Tube and how to replace a plugged fixed orifice tube in an air conditioning system on Mercury Grand Marquis?
A:
Restriction of the flow of liquid refrigerant into the evaporator core is done by the fixed orifice tube assembly. The evaporator temperature is controlled by a pressure-operated electric switch. In cases where high pressure is extremely high and the low pressure is nearly a vacuum, then the fixed orifice tube is blocked and it needs to be replaced. To take it out, disconnect the liquid line connection, lubricate the O-rings, use a special tool to extract the tube, and cap an open line.