Typical repair cost: $30–$1,500
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Heater core needs coolant flow; low system means no heat.
Engine never warms up; gauge reads low.
Restricted flow blocks heat exchange; sometimes back-flushable.
Clicking under dash, vents stay on cold side.
No circulation = no heat anywhere.
Sweet smell + foggy windows = leaking heater core. Park it; coolant fumes are toxic.
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