How to Fix Radiator Leak
Learn how to fix radiator leak with our detailed step-by-step guide. Follow our easy instructions to get it done right.
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0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Locate Source of Radiator Leak
Step 1: Locate Source of Radiator Leak
Check for coolant drips, look for wet spots on radiator, hoses, or connections.
UV Leak Detection Kit
UV dye and light for finding coolant leaks
2 Step 2: Inspect Radiator Hoses and Clamps
Step 2: Inspect Radiator Hoses and Clamps
Check upper and lower hoses for cracks, soft spots, or loose clamps.
Radiator Hose Set
Upper and lower replacement hoses
Hose Clamp Set
Worm-drive clamps for secure hose connections
3 Step 3: Check Radiator Cap and Overflow Tank
Step 3: Check Radiator Cap and Overflow Tank
Test radiator cap for proper pressure, inspect overflow tank for cracks.
Radiator Cap
Replacement pressure cap for cooling system
Coolant Overflow Tank
Replacement reservoir tank
4 Step 4: Repair Small Radiator Leaks
Step 4: Repair Small Radiator Leaks
Use radiator stop leak or epoxy for minor leaks as temporary fix.
Radiator Stop Leak
Chemical sealant for small radiator leaks
Radiator Epoxy Repair Kit
Two-part epoxy for patching radiator leaks
5 Step 5: Replace Radiator if Heavily Damaged
Step 5: Replace Radiator if Heavily Damaged
If radiator has large crack, severe corrosion, or multiple leaks, replace entire unit.
Radiator Assembly
Complete replacement radiator for your vehicle
6 Step 6: Refill Coolant and Bleed Air
Step 6: Refill Coolant and Bleed Air
Fill radiator with 50/50 coolant mix, run engine, bleed air from system, check for leaks.
Engine Coolant 50/50
Pre-mixed antifreeze for refilling system (1 gallon)
Coolant Funnel with Adapter
No-spill funnel for bleeding cooling system