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
AUTOMOTIVE REPAIR CONTRIBUTOR
110,190 POSTS
First, make sure the coolant is full, then check to make sure the engine is running at a normal operating temp. If it is, with the engine hot, running and the heater on, both heater core hoses should get hot. If they don't flush the heater core.