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Relay Box (Engine Compartment) Repair procedures
Relay Box (Passenger Compartment) Description and OperationHyundai Elantra AD (2016-2020) Service Manual: Cylinder Block Repair procedures
Disassembly
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Use fender covers to avoid damaging painted surfaces.
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To avoid damaging the cylinder head, wait until the engine
coolant temperature drops below normal temperature (20°C [68°F]) before
removing it.
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When handling a metal gasket, ...
Hyundai Elantra AD (2016-2020) Service Manual: Coolant Repair procedures
Refilling And Bleeding
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Never remove the radiator cap when the engine is hot. Serious
scalding could be caused by hot fluid under high pressure escaping from
the radiator
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When pouring engine coolant, be sure to shut the relay box
...