AC Hose Assembly

Remove and replace the AC hose assembly on a 2008 Dodge Viper, including evacuation and recharge of the R-134a refrigerant system.

Warnings

Tools required

Parts

• AC hose assembly × 1 — Use OEM specification - varies by specific hose location (condenser, compressor, evaporator)
• AC line O-rings × 1 — Use OEM specification - typically included with hose assembly
• AC system sealant caps (if required) × 1 — Use OEM specification

Fluids

• R-134a

Preparation

1. Park vehicle on level surface and engage parking brake.
2. Allow engine and AC system to cool completely (minimum 2 hours after operation).
3. Disconnect negative battery cable to prevent accidental fan activation.
4. Identify the specific AC hose assembly requiring replacement and note routing for reinstallation.
5. If raising vehicle for access to underbody hoses, lift front end and support securely on jack stands.
6. Place drip pan under work area to catch residual refrigerant oil.

Procedure

1. 1

   Recover refrigerant from AC system
   Connect AC recovery machine to service ports on the AC system. Follow machine manufacturer instructions to fully recover all R-134a refrigerant from the system. Record the amount of refrigerant and oil recovered for recharge reference. System must be completely evacuated before opening any AC lines.
2. 2

   Access the AC hose assembly
   Depending on hose location, access may require removal of underbody panels, wheel well liners, or engine compartment covers. For compressor-area hoses, access is typically from above through the engine bay. For condenser and liquid line hoses, access may be from below or through the front fascia area. Remove any plastic covers or shields blocking access to the hose fittings using Torx fasteners. Check for and remove any retaining clips or brackets securing the hose to the chassis or engine.
3. 3

   Remove hose mounting brackets and clips
   Locate all brackets and retaining clips securing the AC hose assembly along its routing path. Remove fasteners securing brackets to the chassis or engine using appropriate Torx drivers or sockets. Note the location and orientation of each bracket for reinstallation. The Viper typically uses spring clips and bolt-on brackets to secure AC lines away from hot exhaust components.
4. 4

   Disconnect AC hose at compressor end
   Using two wrenches (one to hold the compressor fitting, one to loosen the hose nut), carefully loosen the AC hose connection at the compressor. For quick-disconnect fittings, use the appropriate line disconnect tool to release the spring lock coupling. Remove and discard the O-ring seals from the fitting. Cap or plug the open compressor port immediately to prevent contamination and moisture entry. Some residual oil will drain from the connection.
5. 5

   Disconnect AC hose at opposite end
   Repeat the disconnection process at the opposite end of the hose assembly (condenser, evaporator, or accumulator depending on which hose is being replaced). Use two wrenches to prevent twisting the stationary fitting. Remove and discard O-rings. Cap or plug the open port immediately. Note: For evaporator connections inside the firewall, access may require working through the passenger compartment or removing additional ducting.
6. 6

   Remove AC hose assembly
   Carefully guide the AC hose assembly out of the vehicle, noting its routing path through brackets, around components, and away from heat sources. Take photos or make notes of the exact routing for reference during installation. The hose may be routed through tight spaces between the engine and firewall or along the frame rail.
7. 7

   Prepare new AC hose assembly
   Unpack the new AC hose assembly and verify it matches the old hose in length, fitting types, and configuration. Install new O-rings on both ends of the new hose (if not pre-installed). Coat all O-rings liberally with fresh refrigerant oil (PAG 46 for R-134a systems). Ensure O-rings are properly seated in their grooves without twisting or pinching.
8. 8

   Route and install new AC hose assembly
   Route the new AC hose assembly through the vehicle following the exact path of the original hose. Ensure the hose does not contact exhaust components, sharp edges, or moving parts. Maintain proper clearance from the engine and other heat sources. The hose should follow a smooth path without kinks or tight bends that could restrict refrigerant flow.
9. 9

   Connect AC hose at first fitting
   Remove the protective cap from the first port. Verify the O-ring is properly lubricated and seated on the hose fitting. Insert the hose fitting into the port and hand-tighten the connection. For threaded fittings, use two wrenches to tighten the connection securely without over-tightening (typically snug plus 1/6 turn). For quick-disconnect fittings, push firmly until the spring lock clicks into place and verify the connection is secure by pulling on the hose.
10. 10

    Connect AC hose at second fitting
    Repeat the connection process at the opposite end of the hose assembly. Ensure proper O-ring installation and lubrication. Hand-tighten first, then use two wrenches to achieve final tightness. Do not over-tighten as this can damage the soft metal sealing surfaces or O-rings. Verify both connections are secure and properly aligned.
11. 11

    Reinstall hose brackets and secure routing
    Reinstall all mounting brackets and retaining clips in their original locations to secure the AC hose assembly. Tighten bracket fasteners securely. Verify the hose is properly supported along its entire length and does not contact any moving or hot components. Double-check clearance to exhaust manifolds and other hot components in the engine bay and front fascia area.
12. 12

    Reinstall access covers and panels
    Reinstall any underbody panels, wheel well liners, or engine compartment covers that were removed for access. Ensure all Torx fasteners are properly seated and tightened. Verify no tools or shop towels were left in the engine bay or under the vehicle.
13. 13

    Evacuate and recharge AC system
    Reconnect the negative battery cable. Connect the AC service machine to the system service ports. Perform a vacuum evacuation of the system for a minimum of 30 minutes to remove all air and moisture. Monitor vacuum hold for at least 10 minutes to verify system integrity (vacuum should hold steady). If vacuum holds, recharge the system with the proper amount of R-134a refrigerant according to the underhood specification label. Add refrigerant oil if significant oil was lost during hose removal (typically 2-3 oz for a single hose replacement). Add UV dye if the system previously had dye.
14. 14

    Leak test and verify operation
    With the system fully charged, start the engine and turn on the AC to maximum cooling. Allow the system to run for 5-10 minutes. Use an electronic leak detector or soap solution to check all connections for leaks, including both ends of the new hose assembly. Verify proper AC operation by checking vent temperatures (should achieve 38-42°F at the center vents with ambient temperature above 70°F). Monitor system pressures if gauges are attached. Check for unusual noises or vibrations from the AC system.

Reassembly

1. Reinstallation follows removal in reverse order with emphasis on proper O-ring lubrication and hose routing.
2. Ensure all AC line connections are secure and properly torqued to prevent leaks.
3. Verify hose routing maintains proper clearance from all hot and moving components.
4. Complete system evacuation and recharge is mandatory after opening any AC system connections.

Verification

• Start engine and verify AC system operates normally with no unusual noises or vibrations.
• Check center vent temperature reaches 38-42°F with AC on maximum and engine at normal operating temperature.
• Verify no refrigerant leaks at hose connections using electronic leak detector or soap solution.
• Confirm system holds proper pressure and cycles normally without short cycling or excessive pressure.
• Check that hose routing maintains clearance from exhaust and moving components.
• Verify all access panels and covers are properly reinstalled and secured.

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