heater HYUNDAI SONATA 2023 User Guide

Maintenance
8-26
The high-pressure cooling system has a
reservoir filled with year-round antifreeze
coolant. The reservoir is filled at the
factory.
Check the antifreeze protection and
coolant level at least once a year, at
the beginning of the winter season and
before traveling to a colder climate.
NOTICE
• When the engine overheats from
low engine coolant, suddenly adding
engine coolant may cause cracks
in the engine. To prevent damage,
add engine coolant slowly in small
quantities.
• Do not drive with no engine coolant.
It may cause water pump failure and
engine seizure, etc.
Checking the Engine Coolant
Level
ODN8089004
Check the condition and connections
of all cooling system hoses and
heater hoses. Replace any swollen or
deteriorated hoses.
The coolant level should be filled
between the F and the L marks on the
side of the coolant reservoir when the engine is cool. If the coolant level is low, add enough
distilled (deionized) water to bring the
level to the F mark, but do not overfill. If
frequent additions are required, see an
authorized HYUNDAI dealer for a cooling
system inspection.
Recommended engine coolant • When adding coolant, use only
distilled (deionized) water for your
vehicle and never mix hard water in
the coolant filled at the factory.
• An improper coolant mixture can
result in severe malfunction or engine damage.
• The engine in your vehicle has
aluminum engine parts and must be
protected by an ethylene-glycol with
phosphate based coolant to prevent
corrosion and freezing.
• Do not use alcohol or methanol
coolant or mix them with the specified
coolant.
• Do not use a solution that contains
more than 60% antifreeze or less than
35% antifreeze, which would reduce
the effectiveness of the solution.
EnginE CooLant

Maintenance
8-54
Driver’s side fuse panel
Fuse Name (A) Circuit Protected
S/HEATER (FRT) 25A Front Seat Warmer Control Module, Front Air Ventilation
Seat Control Module
TRUNK 10A ICU Junction Block (Trunk Lid Relay)
DOOR LOCK 20A ICU Junction Block (Door Lock Relay, Door Unlock Relay,
Two Turn Unlock Relay)
MODULE1 7.5A Key Solenoid
MODULE3 10A Driver Door Module, Passenger Seat Relax Unit,
Hazard Switch, Crash Pad Switch (Up),
Front Mood Lamp Unit, Start/stop Button Switch,
Driver/Passeger Smart Key Outside Handle
S/HEATER (RR) 25A Rear Seat Warmer Control Module P/SEAT (PASS) 30A Passenger Seat Manual Switch, Passenger Seat Relax Unit MODULE6 10A Driver Door Module
SAFETY P/WINDOW (RH) 30A Passenger Safety Power Window Module, Door Unlock
Relay, Two Turn Unlock Relay)
P/SEAT (DRV) 30A Dirver Seat Manual Switch, Driver IMS Module
IBU1 15A IBU, Driver/Passenger Door NFC Module, IAU, BLE Unit,
Ignition Switch
AMP 25A AMP, DC-DC Converter (AMP)
SAFETY P/
WINDOW (LH) 30A Driver Safety Power Window Module, Rear Power Window
Switch LH
BRAKE SWITCH 10A IBU, Stop Lamp Switch SUNROOF2 20A Panorama Sunroof, Data Link Connector
AIR BAG2 10A SRS Control Module AIR BAG1 15A SRS Control Module
E-SHIFTER1 10A SCU, Electronic ATM Shift Lever
MEMORY 10A Driver IMS Module, Security Indicator, A/C Switch,
Driver/Passenger Power Outside Mirror,
A/C Control Module, Instrument Cluster,
Rain Sensor, Head-Up Display
MULTI MEDIA 15A Audio, A/V & Navigation Head Unit, DC-DC Converter (AMP/
Audio)
SUNROOF1 20A Panorama Sunroof
MODULE7 10A Front Console Switch, Lane Keeping Assist Unit, IBU,
Crash Pad Switch (Up/Down),
Parking Collision Avodance Assist Unit
Remote Control Smart Parking Assist Unit

08
8-55
Fuse Name (A) Circuit Protected
MODULE5 10A Stop Lamp Switch
MODULE8 10A Front Seat Warmer Control Module,
Front Air Ventilation Seat Control Module,
Passenger Seat Relax Unit, AMP,
Rear Seat Warmer Control Module,
Driver IMS Module, Audio, A/V & Navigation Head Unit
E-SHIFTER2 10A SCU, Electronic ATM Shift Lever
MODULE2 10A IAU, Parking Collision Avoidance Assist Unit,
Cooling Fan Motor, Passenger Seat Relax Unit,
Rear Seat Warmer Control Module
MDPS 7.5A MDPS Unit
A/C 7.5A A/C Control Module, A/C Switch, E/R Junction Block
(Blower Relay, PTC Heater Relay)
MODULE4 10A Front USB Charger, Rear USB Charger, AMP, IBU,
IAU, Parking Collision Avoidance Assist Unit, Audio
DC-DC Converter (AMP/Audio), A/V & Navigation
Head Unit, Surround View Monitor Unit
MODULE9 7.5A IBU CLUSTER 10A Instrument Cluster, Head-Up Display WASHER 15A Multifunction Switch
START 7.5A PCM/ECM, E/R Junction Block (Start Relay), ICU Junction
Block (B/Alarm Relay)
POWER OUTLET 20A Front Power Outlet IBU2 7.5A IBU
A/BAG IND 7.5A Instrument Cluster, Overhead Console Lamp (Lamp)

08
8-57
Engine compartment fuse panel
Fuse Name (A) Circuit Protected
MULTI FUSE-1 IG2 30A
E/R Junction Block (Start Relay), PCB Block
(IG2 Relay)
BLOWER 40A E/R Junction Block (Blower Relay) ABS1 40A ESC Module
B+2 50A ICU Junction Block (IPS4, IPS3, IPS1, Fuse -
AMP, IBU1)
PTC HEATER 50A E/R Junction Block (PTC Heater Relay)
B+3 50A ICU Junction Block (IPS5, IPS7, IPS9, IPS10, IPS8, IPS6)
OIL PUMP1 50A Electronic Oil Pump
COOLING FAN 80A Cooling Fan Motor MDPS 80A MDPS Unit
MULTI FUSE-2 E-SHIFTER 30A SCU
E-CVVT1 40A [G4FN] CVVD ACTUATOR
[====] E/R Junction Block (E-CVVT Relay)
IG1 40A PCB Block (IG1 Relay, ACC Relay)
REAR HEATED 50A E/R Junction Block (Rear Heated Relay)
EPB 60A ESC Module
B+5 60A PCB Block (Engine Control Relay, Fuse - A/C1,
WIPER1, TCU1, HORN, ECU2)
B+1 60A ICU Junction Block (Fuse - P/SEAT (DRV), P/
SEAT (PASS), MODULE1, SAFETY P/WINDOW
(LH), SAFETY P/WINDOW (RH), S/HEATER
(RR))
FUSE HEATED
MIRROR 10A Driver/Passenger Power Outside Mirror, A/C
Switch, A/C Control Module, ECM
ECU5 10A [G4FN] ECM AMS 10A Battery Sensor
FUEL PUMP 1 20A E/R Junction Block (Fuel Pump Relay) A/C 2 10A A/C Control Module
B+4 60A ICU Junction Block (Long Term Load
Latch Relay, Fuse - MODULE3, AIR BAG2,
E-SHIFTER1, SUNROOF1, SUNROOF2, S/
HEATER (FRT), TRUNK, BRAKE SWITCH, DOOR
LOCK)