2011 Genesis 4.6 cooling issue

[DHG]

My 2011 Genesis Sedan 4.6 has a issue where the pressure in the cooling system builds up so much that it releases coolant into to reserve container until it overflows. My mechanic said it may be may Head Gasket allowing exhaust pressure into the coolant system. Does this make sense to anyone?

 

[Sal Collaziano]

My 2011 Genesis Sedan 4.6 has a issue where the pressure in the cooling system builds up so much that it releases coolant into to reserve container until it overflows. My mechanic said it may be may Head Gasket allowing exhaust pressure into the coolant system. Does this make sense to anyone?

Moved to the correct forum.

 

[mike44138]

A head gasket could do this. Also a cooling system with a poor seal allowing the coolant to boil could cause this (usually a bad radiator cap).

Rule out the cooling system first. Perform a pressure test on the cooling system and radiator cap. The spec for the system and the cap is that they should hold 14-19psi. If the cap isn't holding pressure replace it. If the cooling system isn't holding pressure check for obvious leaks. Internally the system could leak from the head gaskets or there are seals between the front timing cover and block that could leak and introduce coolant into the oil. There are also 2 coolant tubes that run under the intake manifold from the heater core to the back side of the front timing cover. Those tubes have a few places where they could leak.

For the head gasket... Change the oil and check the oil for the presence of coolant (milky/frothy oil). If you have coolant in the oil you want to fix it as soon as possible to prevent more severe engine damage (bearings etc). Observe the exhaust for white smoke indicative of burning coolant. Consider compression testing the cylinders to look for low compression. Also consider bore scoping the cylinders to check for the presence of coolant in the combustion chamber.

 

[DHG]

I've had a the cooling system pressure tested. I have replaced the radiator cap. There are no obvious leaks. The oil is clear, but there is a lot of white exhaust.
My mileage is 100,575. Does anyone know if Hyundai will still make the repair under the 100,000 warranty??

 

[DHG]

Unfortunately, neither the dealer I bought the car from, Jim Ellis Hyundai or Hyundai of America is willing to extend any help with this repair. I guess being 575 miles over the warranty makes undesirable return customer. I'm very disappointed in bot the dealer and Hyundai of America!!