hvac

AC Receiver/Drier

for 2007 Ram 3500 5.9L I6 Cummins · 4WD

Difficulty

Moderate

Time

1.7 h

Tools

Steps

✓Fact-checked. Built from OLP's spec database, then independently fact-checked line by line with every correction applied. Master-tech sign-off by Chris Hackleman is queued. Cross-check torque values against the factory manual, and stop if anything looks unsafe. How our data is made.

This procedure covers the removal and replacement of the AC receiver/drier on a 2007 Ram 3500 with 5.9L Cummins diesel engine, including refrigerant recovery and system recharge.

Warnings

⚠️AC refrigerant is under high pressure and can cause severe frostbite. Always wear safety glasses and gloves when working with AC components.

⚠AC work requires proper refrigerant recovery equipment. Venting R-134a to atmosphere is illegal under EPA regulations.

⚠The receiver/drier must be replaced any time the AC system is opened to atmosphere for more than 15 minutes, as it absorbs moisture rapidly.

ℹ️This vehicle may be equipped with either a standard or heavy-duty AC system. Verify receiver/drier location and mounting before beginning work.

Tools required

AC recovery/recycling/recharge machineEssential

Refrigerant scaleEssential

Line wrench set (flare nut wrenches)Essential

Socket set (metric)

Wrench set (metric)

Vacuum pump (if not using AC machine)

Shop towels or rags

Safety glassesEssential

AC line cap setEssential

PAG oil for AC systemEssential

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Parts

AC receiver/drier × 1 — Use OEM specification
AC line O-rings × 2 — Use OEM specification
PAG oil × 1 — Use manufacturer specified viscosity

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Fluids

R-134a

Preparation

Park vehicle on level ground and engage parking brake
Allow engine to cool completely if recently operated
Ensure AC recovery machine is properly calibrated and has adequate tank capacity
Locate the receiver/drier on the passenger side of the engine bay, mounted to the condenser or nearby frame rail
Note the system refrigerant capacity from underhood label (typically 45-52 oz for this vehicle)

Procedure

1
Recover refrigerant from AC system
Connect AC recovery machine to both high and low side service ports. Follow machine manufacturer instructions to completely recover all refrigerant from the system. Record the amount of refrigerant and oil recovered for reference during recharge. Allow vacuum to stabilize indicating complete recovery.
2
Access receiver/drier
The receiver/drier location on this vehicle must be verified against service data, as it may be a standalone canister near the condenser or a desiccant cartridge integrated into the condenser assembly. On some configurations, it may be necessary to remove the front grille or battery for improved access. Remove any plastic covers or air intake components blocking access to the receiver/drier mounting bracket.
3
Disconnect AC lines from receiver/drier
Using appropriate line wrenches to prevent rounding, disconnect the inlet line (from condenser) and outlet line (to evaporator) from the receiver/drier. Be prepared for residual refrigerant oil to drip. Immediately cap all open AC fittings and lines with proper AC caps to prevent moisture contamination and foreign material entry.
⚠Even after recovery, residual pressure may remain. Crack fittings slowly and watch for escaping refrigerant.
4
Remove receiver/drier mounting hardware
Remove the mounting bracket bolt(s) securing the receiver/drier to the condenser or frame rail. The receiver/drier is typically held by a single U-bolt style clamp or bracket assembly. Note the orientation of any insulators or rubber grommets for reinstallation.
5
Remove receiver/drier from vehicle
Carefully remove the receiver/drier from its mounting location. Keep it upright and drain any residual oil into a clean, graduated container. Measure and record the amount of oil removed - this indicates how much fresh PAG oil to add to the new receiver/drier.
6
Prepare new receiver/drier
Remove the new receiver/drier from its packaging only when ready to install. Add the appropriate amount of fresh PAG oil to the new receiver/drier: use the amount drained from the old unit plus 1 ounce, or follow the manufacturer's specification listed in the Mopar service information / underhood label for this vehicle. Add oil through one of the ports before installation.
7
Install new O-rings
Remove the old O-rings from the AC line fittings and discard. Install new O-rings of the correct size onto both the inlet and outlet fittings of the new receiver/drier. Lightly coat the new O-rings with fresh PAG oil or AC system lubricant to ensure proper sealing and prevent damage during installation.
8
Install new receiver/drier
Position the new receiver/drier in the mounting bracket, ensuring proper orientation with the inlet (from condenser) and outlet (to evaporator) ports aligned correctly. Install any rubber grommets or insulators in their original positions. Secure with the mounting bracket hardware, tightening firmly but not over-tightening to avoid crushing the receiver/drier body.
9
Connect AC lines to receiver/drier
Remove caps from AC lines and new receiver/drier ports immediately before connection. Thread the AC line fittings onto the receiver/drier by hand first to ensure proper engagement. Using line wrenches, tighten both connections firmly until snug. Typical tightness is firm hand-tight plus 1/6 to 1/4 turn - do not over-tighten as this can damage O-rings or aluminum threads.
⚠Cross-threading aluminum AC fittings will require expensive line replacement. Always start threads by hand.
10
Evacuate AC system
Connect vacuum pump or AC machine to service ports. Evacuate the system to a deep vacuum (29.5+ inches Hg) for a minimum of 30 minutes, longer in humid conditions. After evacuation, close valves and monitor vacuum gauge for 10-15 minutes. Vacuum should hold steady - any rise indicates a leak that must be repaired before charging.
11
Recharge AC system
Using AC recovery/recharge machine or refrigerant scale, charge the system with the correct amount of R-134a as specified on the underhood label for this specific vehicle (verify exact capacity, which differs between single-evaporator and dual/rear-AC configurations). Charge liquid refrigerant into the high side with engine off, then start engine and complete charge through the low side following machine instructions. Monitor pressures to ensure proper charge level.
12
Leak test system
With system charged and running, use electronic leak detector or approved UV leak detection method to check all connections at the receiver/drier for leaks. Check both the inlet and outlet fittings carefully. If any leaks are detected, recover refrigerant, repair the leak, and repeat evacuation and recharge procedures.

Reassembly

Reinstall any grille panels, battery, or air intake components that were removed for access
Ensure all AC line connections are secure and free from contact with sharp edges or hot components
Verify proper routing of AC lines matches original configuration

Verification

Start engine and turn AC to maximum cold with blower on high
Allow system to run for 5-10 minutes and verify cold air output from vents (typically 38-45°F at center vent)
Check AC pressures: low side should be 25-45 psi and high side 200-275 psi with ambient temperature around 75-85°F
Listen for proper AC compressor cycling - should engage and disengage normally without excessive short-cycling
Verify no unusual noises from AC compressor or refrigerant lines
Perform final visual inspection for any signs of refrigerant oil leakage at receiver/drier connections