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 ProviderUsually 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.
Yes — a thermostat stuck open keeps the engine (and coolant) cooler than normal, so the heater never gets fully hot.
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