2008 Kia Rio AC blows cold air when car is moving when stopped blows cool humid air.

SOURCE: 2001 Kia Optima over heating

I figured this out and fixed it on my 2001 Optima. Mine was an electrical problem, not an overheating problem. The problem shows up when there is a heavier than normal load on the electrical system. For most of us, this is when the air conditioner is running full-blast on a hot summer day. However, it was also occuring when I ran the heater full blast. The heater running full-blast should have lowered the temperature, not raise it. So I tested the coolant temp while the gauge was showing it overheating. The coolant temp was not increasing, but the gauge showed that it was. It is caused by a bad ground connection. Another test you can do to see if your problem is the same as mine is this. As soon as the engine is showing overheating, pull over, park the car and turn off the engine. Immediately start the engine again and see what the temp gauge shows. If it still shows hot, you'll know you've really got overheating coolant. If it goes back to normal range, you'll know it's just a bad ground connection. Turning off the engine eliminates the resistance in the electrical system that has beeen building up and causing an erroneous high temp reading.

To fix: Either find and clean ground connections throughout the vehicle until it fixes it, or do what I did. A mechanic at the Kia dealer showed me this. I ran a new wire from an empty bolt-hole on the top of the engine to a bolt into the frame behind the engine. I only added a 6 inch wire and a new bolt into the top of the engine. The bolt into the frame was already there, so I just removed it, put the wire under it, and replaced the bolt. It created a redundant ground that prevented the build-up of resistance that caused the erroneous temp reading. It was a 5 minute fix and it has never done it again. Kia knows about this problem and they put out a post to their shops on how to fix it.

SOURCE: 2008 Kia Rio-driver's side Mirror installation/DiY repair manual?

Please drive to Kia workshop or one of their Dealers will definately fix at a token.

SOURCE: No heat on kia Spectra(fan blows out cool air)

The thermostat would be the place to start if you are sure its not the heater core. Heater core would have tell tale signs like antifreeze mist blowing in the vents or wet carpet soaked with anti freeze on the car floor, usually tword the passenger side. If its not the core, or the thermostat when you change it, then its probably in the hvac controls, but the core and the thermostat should be checked first. Also let the car warm up and feel both of the small hoses running into the firewall to the heater to see if they are hot. If not, one might be plugged. Hope this helps, Clay

SOURCE: 2002 Kia Rio runs rough when idling

well spend some change and have a simple tune-up.  Plugs and filters and readjust the idle.

SOURCE: 2004 kia rio fan not coming on car running hot

FIRST CHECK FUSE AND RELAY.IF BOTH IS GOOD.SCAN CHECK FOR FAULTY COOLANT TEMPERATURE SENSOR IT TURNS ON COOLING FAN AT SET TEMPERATURE.IF COOLANT TEMP SENSOR IS GOOD.HOT WIRE COOLANT FAN IF DONT WORK FAN MOTOR IS BAD.IF COOLING FAN RUNS WHEN HOT WIRED.THEN YOU HAVE DAMAGE WIRE OR SHORT OR THE CONTROL SWITCH IS BAD.ALSO CHECK HVAC FUSE BEFORE BUYING ANOTHER CONTROL SWITCH THEY ARE NOT CHEAP.