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EDIT: And of course I meant "Downshift Without Heat", because "Without head" sounds like something completely different and borderline pornographic. Apologies.

Hopefully someone will be able to help me; been having a small problem with my 2009 Kia Rio LX.

For some reason the car won't downshift if the car's heat is not on. If the inside defroster (not the rear window defroster) isn't on, often the car will stay at a high gear or, if it's somehow driving at a normal pace, suddenly it will jump up gears and stay there. The car doesn't speed it up, but it just takes a long time to get to the speed I want. The engine light is on, obviously, but not blinking.

The car isn't running poorly at all (beyond that of course). Gas mileage is fine, no funny noises. It's just that without the head on the car won't downshift and it takes a bit longer to get going from a dead stop. If I'm on the interstate going 70MPH it tends to float around the 4 mark on the RPM gauge.

I read all over and I'm having problems finding what the issue could be. I did read about a throttle position sensor which sounds like it could be something but not sure. I'm relatively handy with cars and if there's some obvious stupid fix I'm missing I'd prefer to do it before taking it into a shop. I just want to know what I'm going up against regardless. Thanks a lot for any help you can offer.
 
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