Did you check your water pump? It could be going bad. Sounds like you've checked everything else
SOURCE: Heater doesn't get warm 2004 Kia Sedona. Shop
most likely its a blend door issue but possibly heater core
SOURCE: 2001 kia rio runs rough when accelerating idels
I expect the HT lead(s) are bust, try a new set.
SOURCE: My 2004 Kia Rio over
I would definately check the thermostat first. Its the cheapest and easiest thing to check and replace. But there are definitely a few things that could cause this. Hope this g Helps.
Stuck thermostat maybe?????
SOURCE: car dies when first driving then hard to start
The
following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem. The
engine and the automatic transmission (transmission control is only
for automatics, engine is still computer controlled no matter the
transmission type) in this vehicle are computer controlled and in
most cases when a fault occurs a fault code is stored in the memory
of the computer control module. There are exception to this, such as
the Mass Airflow Meter and fuel pressure problems. What must be done
is to have all the basic testing done such as a scan of the system
for fault codes as well as a check with a live data scanner tool for
engine functions that are not within range of normal, a trained
technician is required to know what is correct and what isn't, then
based on careful diagnostics done from a factory repair manual the
correct part is replaced or the wiring repaired or the computer
replaced (known as the PCM), which is very rarely the problem. Other
basic checks must be done as well such as mechanical problems with
the engine as well as engine state of tune and mileage on the engine.
The transmission can have mechanical issues as well such as no gear
engagement at all or a failed pump or other pressure related
problems. Also engine mechanical problems ca cause many
drive-ability related problem such as rough idle and other symptoms
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