What to Expect: Typical Service Times
- Heating system inspection and diagnosis: 30 to 60 minutes
- Thermostat replacement: 1 to 2 hours
- Blower motor or resistor replacement: 1 to 2 hours
- Blend door actuator replacement: 2 to 4 hours depending on vehicle
- Coolant flush and heater system service: 1 to 2 hours
- Heater core replacement: 4 to 8 hours depending on vehicle make and model
How Our Technicians Approach Heating System Diagnosis
When a vehicle arrives with a heating complaint, we start by gathering a thorough description of the symptoms: whether the issue is no heat, reduced heat, no airflow, an odor, or a windshield fogging problem. The combination of symptoms narrows the likely cause before any testing begins.
We start with the simplest check: coolant level and condition. Low coolant is a common cause of reduced heat that requires only a refill and a leak investigation to resolve. Heavily contaminated coolant tells us the system has exceeded its service interval.
We then verify thermostat operation by monitoring coolant temperature during engine warm-up. An engine that takes an unusually long time to reach operating temperature confirms a stuck-open thermostat.
We check heater core flow by measuring the temperature differential between the heater inlet and outlet hoses with the engine at operating temperature. Hot coolant entering and leaving significantly cooler indicates good flow. Similar inlet and outlet temperatures indicate a restriction.
We test blower motor operation at all fan speeds and command the blend door actuators through their full range of motion using a scan tool, observing whether each actuator responds and whether the temperature delivery in the cabin changes as expected. Once the diagnosis is confirmed, we walk you through exactly what we found and what the repair involves before any work begins.
