Kia Troubleshooting Questions? Ask a Mechanic
Sorry about Pearl; she's a robot. She likes to pretend she's not, but she is.
I'm suspecting that the two problems might be related, but not necessarily in the way it seems. What I mean to say is, is it possible that the vehicle was running a little hot before adding to the transmission? If the transmission was running hot it could have been causing it to slip- transmission fluid doesn't like being too hot.
Have you checked the coolant level yet?
Also, do you have the 4 cylinder or 6 cylinder?
Ok. That's good.
Is yours the 4 cylinder or 6 cylinder?
Do you have a check engine light on?
When the vehicle was getting hot, could you hear the electric cooling fans running?
Check to see if the fans are coming on when it's overheating. If you don't hear them on, try putting the AC on- the AC should make turn the fans on unless they are burned out.
I've never seen oil short an electrical connection. Oil and other lubricants don't conduct electricity very well and therefore don't typically cause damage to wiring or electrical connections.
It would be more likely that the engine is acting up rather than the transmission and it just feels like a transmission issue. The AC compressor could be putting extra load on the engine which then causes it to run poorly. Rarely have I ever seen the AC compressor cause an electrical problem that could then affect the transmission. I say electrical problem because that is the only common link between the AC and the transmission.