Car Heater Not Working
Troubleshooting Car Heater Not working Problem
Helpful InformationRelated Car Repair Information:
Sometimes engine coolant level can be low without the engine overheating, especially in winter conditions. A heater control valve can be actuated by either a vacuum line or control cable. To warm the passenger cabin, the heater system makes use of heat generated from the engine by blowing across the heater core and onward through the system ductwork. When a heater core develops a leak, there are usually two indications, steam could be produced from the vent system and is accompanied by a pungent odor, or the passenger floor can become wet from leaking coolant, these are signs the core needs replacement.
Step by step guide on how to fix an automotive heater, this information pertains to most vehicles.
- Flashlight
- Screwdriver set
- Protective gloves and eyewear

Heater Controls


Blend Door Actuator

Broken Vacuum Line

Heater Control Valve

Vacuum Gauge
Step 6 - The heater core is responsible for converting hot coolant into heated air, if this core becomes plugged it will not operate correctly. To check for a plugged heater core, start the vehicle and allow the engine to warm up to normal operating temperature while turning the heater to its hottest setting. Grasp both heater hoses, they both should be hot, if only one is hot, the core could be plugged or the heater control valve is malfunctioning.

Heater Core

Blower Motor

Replacing Air Cabin Filter
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