Inspect Car Heating System for Winter Reliability

Cost Savings

Checklist Tasks

• Check coolant reservoir level and color for leaks or contamination.
• Inspect heater hoses for bulges or seepage near clamps.
• Feel radiator hoses after warm-up to detect heater core blockage.
• Test all blower fan speeds and listen for unusual noises.
• Switch between heat and defrost modes to verify airflow and blend door function.
• Check for sweet smell or fog on windshield for heater core leaks.
• Check under passenger carpet for dampness from hidden leaks.
• Monitor engine warm-up time to spot thermostat problems reducing heat.
• Test vent temperature with a thermometer for uneven heat or blocked ducts.
• Inspect for coolant leaks under dash or near the firewall.
• Check cabin air filter for clogging to avoid reduced heating capacity.
• Cycle recirculation mode and listen for fan noise changes to detect actuator faults.