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 CORE CASESERVICE AND REPAIR
1991 Hyundai Sonata V6-3.0L
Heater Core Case: Service and Repair
1991 Hyundai Sonata V6-3.0LSECTION Service and Repair
HEATER REMOVAL
1. Disconnect the negative terminal of the batterv.
2. Drain the coolant from the radiator.
3. Remove the heater hoses and drain hose.
4. Using the special tool 09977-33600 (A/B), remove the suction hose and the liquid tube,
5. Remove the front and the rear console assembly.
6. Remove both side covers.
7. Remove the glove box, center crash pad cover, center crash pad and the cassette assembly.
8. Remove the lower crash pad.
9. Remove the console mounting bracket and the center support bracket.
10. Remove the rear heating duct assembly (LH/RH) and the rear heating joint duct.
11. Remove the control assembly.
12. Remove the heater assembly.
INSPECTION
1. Check the link mechanism for operation.
2. Check the heater core for restriction or water leakage.
3. check the water valve for operation and clogging.
INSTALLATION
Installation is the reverse of the removal procedures.
RENDER: 1.0x
NO RELATED
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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.