Weak Or Not Enough Heat
The heater works but never gets truly hot — only lukewarm air. Common causes are low coolant, a partially clogged heater core, or a thermostat issue.
Find a TechnicianCommon causes
- Low coolant level
- Partially clogged heater core
- Thermostat stuck open (engine runs cool)
- Air trapped in the cooling system
- Weak water pump
Frequently asked questions
Why is my heat only lukewarm?
Usually the heater core isn't getting full hot-coolant flow — from a low level, a partial clog, or a thermostat that keeps the engine too cool.
Could a stuck thermostat cause weak heat?
Yes — a thermostat stuck open keeps the engine (and coolant) cooler than normal, so the heater never gets fully hot.
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