I have an 02 Hyundai Elantra 2.0L GLS and I just had the Radiator replaced cause my old the top tank cracked open. Now I notice 3 days after I had the Radiator changed my shifter inside the car is hard to put the car in park Reverse or drive it feels like the cable is pulling hard. Now I notice the place where they did the job was kind of sloppy and spilled Antifreeze all over the engine so I bought 2 cans of engine cleaner and washed out the complete engine compartment. After this was done the shifter inside the car was smooth and back to normal no more being hard. Now 3 more days went by and the problem is back the shifter is hard to place the car in drive etc. but I notice once the car warms up after driving it goes away. I was thinking maybe the line that goes to the radiator from the tranny needs to be bleed or maybe they didn't add the lost tranny fluid that was lost when they replaced the radiator can anyone give me any ideas?? (PLEASE)

 

Sounds like when your radiator started leaking it got into the linkages of the trans and gunked it up. The solution is to lubricate the linkages.