Guys thanks for your help 2004 Kia heat core must have been air lock. Car has no bleed screw for coolant system. Ran car heat on. cap off jack car up ran car cap on an off. still low heat at idle Pull heater hose a little air came out reinstalled hose top coolant ran at high idle installed cap car is good now drive it two hours road test cks out ok. Thanks for all your help just be careful coolant warm at heater hose
Dear,
your cooling system needs flashing,
1- drain the old water from cooling system, valve is on the radiator.
2- change your thermostat.
3- fill the cooling system with water.
4- add 1 litter of concentrated anti-freeze to it.
5- warm up the car till the fan start and try.
note that: the 2 hoses connected to the warmer core should be dismonted and cleaned.
Make sure to check your coolant tank at every fill-up for a few fill-ups. This problem has a way of coming back if you don't top up your coolant at just the right times.
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