Verify Coolant Flow After Temp Spikes

Cost Savings

Checklist Tasks

• Inspect radiator cap seal for cracks or hardening that may cause pressure loss.
• Check radiator hoses for soft spots or delamination to avoid collapse during flow.
• Use infrared thermometer to compare inlet and outlet hose temps for blockages.
• Test coolant reservoir return flow during warm-up and cool-down for circulation.
• Check water pump weep hole for coolant traces indicating possible seal failure.
• Verify heater core hoses are equally warm after idling to detect clogs or airlocks.
• Bleed air from the cooling system according to manufacturer instructions.
• Check thermostat housing for seepage or corrosion to catch faulty thermostats.
• Inspect radiator neck and core for debris or corrosion causing restriction.
• Monitor coolant flow in radiator (cap off, engine cold then idling) for circulation.
• Confirm auxiliary fan operates at correct temperature to ensure heat removal.
• Scan for trouble codes related to coolant sensors affecting fan or temp readings.