Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHYUNDAI1991SONATA V6-3.0LREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGHEATER CORESERVICE AND REPAIR
1991 Hyundai Sonata V6-3.0L
Heater Core: Service and Repair
1991 Hyundai Sonata V6-3.0LSECTION Service and Repair
Fig. 8 Heater Case, Core & Evaporator Assembly:
1. Disconnect battery ground cable, then drain cooling system and discharge refrigerant.
2. Disconnect heater hoses, then using tube remover 09977-33600 or equivalent remove suction hose and liquid tube.
3. Remove front and rear console assembly, then both side covers.
4. Remove glove box, center crash pad cover, center crash pad and cassette assembly.
5. Remove lower crash pad, console mounting bracket and center support bracket.
6. Remove left and righthand rear heating duct assembly and rear heating joint duct.
7. Remove control assembly, then remove heater assembly.
8. Remove heater core or evaporator from heater assembly, Fig. 8.
9. Reverse procedure to install.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.