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First I would check your radiator fluid level, sometimes being low can have this effect. Usually the rear heaters sit at a lower level and so keep working. If that is fine, then you probably have an issue with the diversion door or controller that controls the hot/cold mixture.
this sounds like you thermostat maybe partally stuck, or you cooling fans are not comeing on, check all your fuses and be sure the fans kick on high speed when the car gets hot at idle not driving, if they do come on try rplacing the thermostat,
it should ony blow hot from the vent on the floor. this is controlled from a button on the dash labled RR HEATER. if the vents are blowing hot from the roof its another problem. let me know if you need more help
Currently there are four motor mounts on the 2003 Kia Sedona. You have a (1) front mount by the radiator, (2) mounts on the top side of the motor driver and passenger. And (1) last one on the rear of the engine.
Check the metal part of the heater core lines at the firewall if you can get to them and see if one side is noticeable colder than the other. At least one of them should be hot or you have a bad thermostat. If both are hot than your hot/cold actuator inside is having a problem
This is typical. When cold starting/running, it takes more amps to run. It is using amps for higher idle to warm up engine, Altenator is spinning faster, and all sensors are being used at same time. This is why mechanics say wait til normal operating temperature before any testing is done. Once the engine hits normal temp, the computer readjust voltage amps, fuel pressure, air intake, timing and more.
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