Coolant Leaks
Concise coolant leak path for pressure testing, hose/radiator/water pump separation, and estimate handoff.
Coolant leaks should be pressure-tested and located before parts are priced, because radiator, hose, pump, cap, and thermostat-housing leaks can look similar from above or below.
Common Sounds or Signs
- Sweet coolant smell after parking
- Low coolant warning or repeated top-offs
- Drips under the front of the vehicle
- Steam or residue near hose ends, radiator tanks, or water pump
Quick Checks
- Pressure test the system cold and inspect with good lighting
- Check radiator tanks, hose ends, clamps, cap, and reservoir
- Inspect water pump weep hole and pulley area
- Look for overheating history before approving a simple leak repair
Inspection Priority
- Verify coolant level and condition first.
- Inspect thermostat behavior and circulation evidence together.
- Pressure test the cooling system when coolant loss or smell is present.
Diagnostic Path
Pick the first inspection path.
External Leak Path
Find the first wet point before replacing parts downstream from the leak trail.
- Pressure test and trace the highest wet area
- Inspect hoses and clamps while the system is pressurized
- Check radiator tank seams and cap behavior
Overheat Risk Path
If coolant loss caused overheating, verify fan, thermostat, and circulation before closing the quote.
- Confirm fan operation at idle
- Check thermostat behavior and heater output
- Bleed air and recheck pressure after repair
Related OBD Codes
Use scan data to narrow the system.
- P0128 - Coolant thermostat below regulating temperature
Common Next Steps
Quick checks before expanding the estimate.
Pressure test cooling system
Confirm external leaks, cap behavior, and pressure loss before parts.
Inspect thermostat
Compare warm-up, scan temperature, and hose temperature behavior.
Verify radiator fan operation
Check fan command, AC-load response, fuses, relays, and airflow.
Related Inspection
Related Symptoms
Compare nearby complaint patterns.
Overheating At Idle
Use when coolant loss is paired with temperature rise in traffic or at stops.
White Smoke From Exhaust
Use when coolant loss may be internal instead of an external leak.
Recommended Next Repair Paths
Compare repair paths before replacing parts.
Radiator Replacement
Use when pressure testing confirms tank, seam, or core leakage.
Explore Related Systems
Use when multiple systems overlap.