cooling

Radiator Cap

for 2002 Dodge Viper 8.0L V10 · RWD

Difficulty

Easy

Time

12 min

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 removal and installation of the radiator pressure cap on a 1992 Dodge Viper with 8.0L V10 engine.

Warnings

⚠️Never remove the radiator cap when the engine is hot or warm. The cooling system operates under pressure and removing the cap can cause violent discharge of scalding coolant resulting in severe burns.

⚠Wait at least 30 minutes after engine shutdown before attempting this procedure to allow coolant to cool and pressure to dissipate.

ℹ️The 1992 Viper uses a traditional radiator cap on the radiator itself, not a remote expansion tank cap.

Tools required

Clean shop towel or ragEssential

Coolant container (if draining excess)

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Parts

Radiator pressure cap × 1 — OEM 13 psi rating or equivalent

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

Preparation

Ensure the engine has been off for at least 30 minutes and is completely cool to the touch
Verify the radiator and upper hose are cool by carefully touching the radiator tank surface
Open the hood and locate the radiator cap at the top of the radiator on the driver's side
Place a clean shop towel over the cap area to catch any residual coolant spray

Procedure

1
Release System Pressure
With the shop towel draped over the cap, slowly turn the radiator cap counterclockwise to the first stop (approximately 1/4 turn). This releases any residual pressure in the system. Listen for a hissing sound indicating pressure release. Wait until all hissing stops before proceeding.
2
Remove Radiator Cap
Once pressure is fully released, press down on the cap while continuing to turn counterclockwise. The cap will disengage from the radiator filler neck. Lift the cap straight up and away from the radiator. Inspect the cap's rubber seals for cracks, hardening, or deterioration.
3
Inspect Radiator Filler Neck
Examine the radiator filler neck sealing surface for corrosion, damage, or debris. Clean any debris from the neck using a clean shop towel. Check that the filler neck is not cracked or deformed, as this will prevent proper cap sealing.
4
Install New Radiator Cap
Place the new radiator cap onto the filler neck, aligning the cap's locking tabs with the neck's slots. Press down firmly on the cap and turn clockwise until the cap locks into place with a positive click. The cap should seat fully against the filler neck.
5
Verify Cap Installation
Confirm the cap is fully seated by attempting to turn it further clockwise—it should not move. Gently pull upward on the cap to ensure it is locked. The cap should not lift off without pressing down and turning counterclockwise.

Reassembly

The radiator cap should lock positively into place with no movement when installation is complete
Ensure the cap is seated flush against the filler neck with no gap visible

Verification

Start the engine and allow it to reach normal operating temperature while monitoring for coolant leaks at the cap
Check that the upper radiator hose becomes firm as the thermostat opens, indicating proper system pressurization
After the engine cools, verify the coolant level is at the proper mark on the radiator (visible through filler neck when cap is removed)
Inspect for any coolant residue or seepage around the cap that would indicate improper sealing or a defective cap