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Dodge Ram 4000 A/C Liquid Line with Orifice Tubes

Dodge Ram 4000 A/c liquid line with orifice tubes

Starting at $16.95, AutoBuffy stocks 2 A/C liquid line with orifice tube assemblies from UAC to fit the Dodge Ram 4000. This line carries high-pressure liquid refrigerant from the condenser toward the evaporator, while the integrated orifice tube meters refrigerant flow into the low-pressure side. A failed line or clogged orifice tube kills cooling performance and can damage the compressor.

Signs your Dodge Ram 4000 needs a new A/C liquid line with orifice tube

  • A/C blows warm or only slightly cool air even when set to maximum cold
  • Visible refrigerant oil stains or wet residue along the line or at fittings, indicating a leak
  • A/C compressor cycles on and off rapidly or clutch engages but system pressure readings are abnormal
  • Frost or ice buildup at the orifice tube end of the line, signaling a restriction in refrigerant flow
  • Musty or chemical odor inside the cabin caused by refrigerant escaping near the firewall
  • System fails to hold a vacuum during leak testing, traced to a compromised section of this line

Which A/C liquid line with orifice tube should you buy for your Dodge Ram 4000?

The most important decision is whether to buy an OE-equivalent direct-fit assembly or an aftermarket unit with an upgraded orifice tube screen. You also need to confirm the line is the correct length and uses the correct fitting style for your Dodge Ram 4000, as routing and connection types vary. Pre-assembled units save time and reduce the risk of introducing contamination during installation.

OE-Equivalent Direct-Fit Assembly
Best for
Owners who want factory-matched routing, fittings, and orifice tube sizing with zero guesswork
What you get
Pre-formed aluminum or steel line, crimped fittings, and an orifice tube matched to factory flow specifications
Aftermarket Performance Assembly
Best for
Vehicles with a history of orifice tube clogging or those used in high-heat climates
What you get
Upgraded orifice tube with a finer debris screen and sometimes improved line material for better heat resistance
Line-Only Replacement (no orifice tube)
Best for
Systems where the orifice tube was recently replaced and only the line itself is damaged or leaking
What you get
Bare line with fittings; requires reuse or separate purchase of a compatible orifice tube
Universal Line with Compression Fittings
Best for
DIY repairs on older or hard-to-source vehicles where a direct-fit part is unavailable
What you get
Flexible or semi-rigid line cut to length with field-installed fittings; requires careful installation to avoid leaks

A/c liquid line with orifice tubes brands we stock for your Dodge Ram 4000

UAC
2 options · from $16.95

Replacing the A/C liquid line with orifice tube on a Dodge Ram 4000

Advanced⏱ 1.5–3 hoursA/C manifold gauge setVacuum pumpLine wrench set (for flare fittings)Refrigerant recovery machine or shop recovery serviceSnap-ring or orifice tube removal tool (if servicing tube separately)

Before starting, have the refrigerant professionally recovered — releasing refrigerant to the atmosphere is illegal under EPA regulations. With the system empty, disconnect the fittings at each end of the liquid line using the correct line wrenches to avoid rounding the soft fittings, then route and connect the new assembly, replacing O-rings with refrigerant-compatible ones lightly coated in PAG oil. After the line is secured, pull a deep vacuum on the system for at least 30 minutes to remove moisture and air before recharging to the specification on the Dodge Ram 4000 underhood label.

Frequently asked questions

How much does it cost to replace a/c liquid line with orifice tubes on a Dodge Ram 4000?
Parts start at $16.95 for the Dodge Ram 4000 at AutoBuffy. Add shop labor of roughly one to two hours if you are not doing the work yourself. Factor in the cost of refrigerant recovery, evacuation, and recharge, which most shops charge separately. Total out-of-pocket cost varies by region and whether other A/C components need replacement at the same time.
Can I drive my Dodge Ram 4000 with a leaking A/C liquid line?
You can drive short distances, but it is not advisable. A leaking high-pressure liquid line will allow the system to lose refrigerant, and once pressure drops too low the compressor will either cycle off repeatedly or run without adequate lubrication. Continued operation risks compressor failure, which is a far more expensive repair than replacing the line.
What does the orifice tube in the line actually do on a Dodge Ram 4000?
The orifice tube is a fixed metering device that restricts refrigerant flow from the high-pressure liquid side to the low-pressure evaporator side. This pressure drop causes the refrigerant to expand and absorb heat, which is what cools the cabin air. A clogged or damaged orifice tube disrupts this process and causes warm air output or compressor stress.
How often does the orifice tube need to be replaced on a Dodge Ram 4000?
There is no fixed mileage interval, but orifice tubes should be inspected any time the A/C system is opened for service. Debris from a failing compressor or deteriorating hose material commonly clogs the screen. If the screen shows heavy debris, metal particles, or damage, replace the entire assembly rather than just cleaning and reinstalling the old tube.
Do I need to flush the A/C system when replacing the liquid line on a Dodge Ram 4000?
Yes, flushing is strongly recommended if the old orifice tube screen contained metal shavings or heavy black debris. Contamination from a failing compressor travels through the system and can block a new orifice tube within a short period. Flush the condenser and evaporator, replace the accumulator or receiver-drier at the same time, and recharge with fresh refrigerant and oil.
Is replacing an A/C liquid line with orifice tube a DIY job on a Dodge Ram 4000?
It is a moderate to advanced DIY task. The system must be professionally recovered before disassembly because releasing refrigerant is illegal and dangerous. Once empty, most home mechanics can swap the line with basic hand tools. The system must then be evacuated with a vacuum pump and properly recharged, which requires equipment not typically found in a basic home garage.

Shop a/c liquid line with orifice tubes by year for the Dodge Ram 4000

20102009200820072006200520022001200019971996

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