Radiator Hose - Lower

Remove and replace the lower radiator hose on a 1992 Dodge Viper 8.0L V10, including coolant drain and refill procedures.

Warnings

Tools required

Parts

• Lower radiator hose × 1 — Use OEM specification
• Hose clamps (if reusing original clamps shows wear) × 2 — Worm-drive style, appropriate diameter

Fluids

• Ethylene glycol 50/50 — 24 qt

Preparation

1. Verify engine is completely cool to the touch.
2. Position vehicle on level ground and apply parking brake.
3. Place protective covering over front fenders and ground beneath radiator area.
4. Locate lower radiator hose running from bottom of radiator to water pump inlet on passenger side of engine block.

Procedure

1. 1

   Drain cooling system
   Position drain pan beneath radiator. If the radiator is equipped with a drain petcock, locate it at the bottom of the radiator and open it to drain. If no petcock is present, drain by disconnecting the lower hose. Open petcock by turning counterclockwise and allow coolant to drain completely. If petcock is not present or not functioning, proceed by loosening lower hose clamp at radiator and carefully pulling hose off to drain system into pan. Collect and inspect coolant condition - if contaminated with oil or rust, cooling system may require flushing.
2. 2

   Remove radiator pressure cap
   Once coolant flow has slowed, remove radiator pressure cap to allow full drainage and vent system. This allows air to enter and complete the draining process.
3. 3

   Release lower hose clamp at radiator
   Locate hose clamp securing lower radiator hose to radiator outlet at bottom of radiator. If equipped with worm-drive clamp, use flat-blade screwdriver to loosen clamp screw and slide clamp back on hose away from radiator connection. If equipped with spring clamp, use hose clamp pliers or 8mm socket to compress clamp tabs and slide clamp back on hose. Position clamp at least 3 inches away from radiator neck.
4. 4

   Disconnect hose from radiator
   Twist lower radiator hose back and forth while pulling away from radiator outlet to break seal. Pull hose straight off radiator neck. Expect residual coolant to drain - have shop towels ready. Inspect radiator outlet neck for cracks, corrosion, or damage.
5. 5

   Release lower hose clamp at water pump
   Locate hose clamp securing lower radiator hose to water pump inlet on the engine (verify inlet location against vehicle-specific documentation). Use same method as step 3 to loosen and slide clamp back on hose away from water pump connection, positioning clamp at least 3 inches from inlet neck.
6. 6

   Remove lower radiator hose
   Twist hose back and forth while pulling away from water pump inlet to break seal. Remove hose completely from vehicle. Inspect water pump inlet neck for cracks, corrosion, or damage. Clean both radiator outlet and water pump inlet with shop towel, removing any old rubber residue or corrosion.
7. 7

   Prepare new lower radiator hose
   Compare new hose to old hose to verify correct part and orientation. If reusing clamps, inspect for corrosion, damaged threads, or weakened spring tension - replace if any issues found. Slide clamps onto new hose in correct positions: one clamp near each end, positioned so they will sit on straight hose sections when installed (not on bends).
8. 8

   Install hose to water pump
   Push water pump end of lower radiator hose firmly onto water pump inlet until hose bottoms against inlet shoulder. Ensure hose is fully seated with no gaps visible between hose and inlet neck. Slide clamp forward to position approximately 1/2 inch from end of inlet neck, centered over inlet connection. Tighten clamp securely.
   Torque spec

   Hose Clamps3 Nm (2 lb-ft)
9. 9

   Install hose to radiator
   Route hose to radiator outlet, ensuring hose follows natural curve without kinks or twists. Push radiator end of hose firmly onto radiator outlet neck until hose bottoms against neck shoulder. Verify hose is fully seated with no gaps. Slide clamp forward to position approximately 1/2 inch from end of outlet neck, centered over connection. Tighten clamp securely.
   Torque spec

   Hose Clamps3 Nm (2 lb-ft)
10. 10

    Close drain petcock
    If radiator petcock was opened in step 1, close petcock by turning clockwise until snug. Do not overtighten.
    Torque spec

    Drain Petcock7 Nm (5 lb-ft)
11. 11

    Refill cooling system
    Using funnel, slowly pour 50/50 ethylene glycol coolant mixture into radiator filler neck until level reaches approximately 1 inch below filler neck opening. Pause periodically to allow coolant to settle and air to escape. Verify total system capacity against vehicle-specific service data before purchasing coolant. Also fill coolant recovery tank to FULL COLD mark. Install radiator pressure cap securely.
12. 12

    Burp cooling system
    Start engine and allow to idle with heater controls set to maximum heat and fan on low. Monitor temperature gauge closely. As engine warms, thermostat will open and coolant level may drop - add additional coolant as needed through recovery tank. Run engine until cooling fans cycle on and off at least once, confirming thermostat operation and air purge. Squeeze upper radiator hose several times to help release trapped air bubbles.
13. 13

    Final coolant level adjustment
    Shut off engine and allow to cool for 30 minutes. Carefully remove radiator cap (system will still be under some pressure) and check coolant level - top off if needed to bring level to 1 inch below filler neck. Verify recovery tank is at FULL COLD mark. Reinstall radiator cap. Inspect lower radiator hose connections for any signs of leakage.

Reassembly

1. Verify both hose clamps are positioned correctly and tightened to specification.
2. Double-check coolant level in both radiator and recovery tank after engine has fully cooled.
3. Clean up any spilled coolant from engine bay and ground.

Verification

• With engine cold, inspect both lower radiator hose connections for any signs of coolant seepage or wetness.
• Start engine and bring to operating temperature while monitoring for leaks at hose connections and observing temperature gauge remains in normal range.
• After test drive and cool-down, recheck coolant level in radiator and recovery tank - top off if needed.
• Verify cooling fans operate normally and temperature gauge reads in normal operating range.
• Inspect ground beneath vehicle after overnight parking to confirm no coolant leaks are present.

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