Heater Blowing Cold Air
You select heat but the vents blow cold. The fan works, but no warmth is being added — typically a coolant flow or blend-door issue.
Find a TechnicianCommon causes
- Low coolant or air in the system
- Clogged heater core
- Stuck-open thermostat
- Blend-door actuator failure
- Failed water pump (reduced coolant flow)
Frequently asked questions
Why does the heater blow cold when set to hot?
Either hot coolant isn't reaching the heater core (low coolant, clog, thermostat) or the blend door isn't directing air through it.
Could low coolant cause this?
Yes — low coolant is one of the most common and easiest-to-check causes of cold heater air.
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