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Discussion Starter · #1 ·
I have a 2011 Sonata SE with about 137k miles on it that I need to identify the heater hoses on. Which of the two hoses going into the firewall is the inlet and which is the return hose?

I am installing a "T" to do a complete cooling system flush on this car before giving it to my daughter who just got her drivers license. Its my understanding that this "T" needs to be installed on the INLET hose so it is obviously critical that I identify the correct hose in order to flush the heater core and block.

Coolant is murky and pretty dark rather than the pretty green color that it should be and want to clean up the system before sending her on her way with it.

Thank you!!
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