Question about 2004 Kia Sorento

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Kia radiator top hose is hot, bottom is cold. What is the problem?

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Check to see if the top hose is getting hard there maybe a chance your thermostat is stuck and worse case is the water pump gone :(

Posted on Jan 04, 2013

  • Mike Jan 04, 2013

    Have already done all of that. FYI there is no water leak, just reading hot and lower hose is cold. Thanks!

  • talewind Jan 05, 2013

    just finished my truck today was having the same problem with no heat i flushed the system changed the water pump which needed to be changed but didnt help. today i bypassed the heat control valve and now have mass heat. also found out that the lower radiator hose will not get as hot as the upper guess we learn something new every day.

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Normal operation is that the engine starts the thermostat is closed , engine block heats up and opens water starts to circulate around the block

So to check that you need to fill the radiator with cold water run it for a few minutes check the bottom hose it should be cold

The stat opens and the bottom hose should get hot as the water from the block is pumped into the radiator for cooling.

The radiator should get hot all over and the cooling fan should kick in when the sensor hits the over limit stop.

If that does not happen then get someone to remove the stat altogether (It is only there to get the engine block warm quickly in cold regions )

In which case the bottom hose should go from cold to warm to hot

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