2004 KIA Sorento - When I go to start in the morning it wont start. I remove the radiator/reservoir cap and there is pressure on a cold system. as soon as the pressure is released the chances of starting are greater but sometimes it still will not start. Thermostat? why pressure on a cold tank? ...bad cap?

SOURCE: '97 subaru overheating

head gasket most likely.

SOURCE: 2003 kia sorento coolant change

you shoud not have to change it.this wouldbe long life
antifreeze have the PH check at a shop

SOURCE: I have a 2004 Kia Sorento that is leaking antifreeze

could be one of the two radiator hoses. There are also two hoses in back that go to the heater core. All of these connections attach to plastic nozzles on the radiator and also the ones on the heater core are plastic and can crack. Also check radiator condensor for leaks.

SOURCE: Radiator blockage?

I believe you have a head gasket blown or a cracked head. When you start it up COLD with the cap off, it would push water out immediately. Fill it with plain water and try this. It might not be a bad idea to perform a pressure test too. Also check for antifreeze in the oil. It will get milky looking and might even be over full. If this happens after warm-up, you may just have a plugged radiator. Have it professionally cleaned. The water pump vanes could also possibly be corroded off and it's not effectively displacing coolant. Hope this helps.

Colin Stickland

• 22516 Answers
• Posted on Nov 25, 2009

SOURCE: i replaced the water pump,thermostat

head gasket