Repair Safety Notice:
This information is for general instructional purposes only. Vehicle repair can be dangerous.
Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
and consult a qualified repair shop when needed.
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JACOBANDNICKOLAS
CAR REPAIR CONTRIBUTOR
110,190 POSTS
Make sure the coolant is full. Make sure the engine is warming to a normal operating temp. Make sure both heater core hoses get hot. If they do, check the blend door. If only one gets hot, flush the heater core.