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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MMPRINCE4000
AUTOMOTIVE REPAIR CONTRIBUTOR
8,548 POSTS
Normally one would expect a thermostat, but with engine at temp, quickly touch the heater core hoses. If one is hot and one cold then heater core is blocked. If both are cold then thermostat.