The heater is warm while driving but goes cold when you stop or idle. This usually points to low coolant, a weak water pump, or circulation problems.
Find a ProviderAt idle, coolant flows slower; if the level is low or the pump is weak, not enough hot coolant reaches the heater core when you're not moving.
It can hint at cooling-system issues that also affect the engine, so it's worth diagnosing before it gets worse.
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