News Technical Service Bulletins

Hyundai Coolant Leak

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The procedure requires the removal of the intake manifold.

This bulletin applies to 2014-2016 Hyundai Genesis vehicles equipped with a 5.0L engine and automatic transmission. Some vehicles may exhibit a coolant leak between the automatic transmission fluid (ATF) connector and engine side heater pipe, requiring replacement of the ATF warmer connector using pipe O-ring P/N 25462-3F300.

Remove the engine cover and drain about one gallon of coolant into a clean container. Remove the intake and air inlet hoses and intake manifold. Remove the two bolts at the brackets that secure the pipe near the rear of the engine. Remove the bolt near the front of the engine and disconnect the clamp and hose. Push the pipe toward the rear of the engine and disconnect the forward end of the pipe from the housing. Pull the pipe up 2-3 inches and pull the pipe toward the radiator to gain access to the connector. Remove the two nuts that secure the connector to the pipe and disconnect the pipe from the connector. Remove the O-ring and install the O-ring on the end of the pipe near the radiator Reconnect the pipe to the housing and connector and torque the two nuts to 6-10 Nm (5-7 ft-lb) gradually and evenly until tightened.  Install the three bolts that secure the pipe. Reinstall the intake manifold and intake air duct and add engine coolant. Attach a GDS and check the coolant level, according to the shop manual. Check for coolant level, and pressure test to confirm that no leaks are present.


Bolts secure the coolant pipe.


Install a new O-ring on the end of the pipe near the radiator.


Use GDS to check coolant level.

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