I have a Derbi gp1 50 cc Liquid cooled. After running for 15 minutes it starts to over heat. any suggestions?

Radiator cooling fans not working? The ECM is protecting the engine by shutting it down.

Check the start / run capacitor and the start relay

Did u change the wires also?

On heat mode, the indoor unit wont start until it gets hot. The outside compressor unit will be running while this is happening. If the unit worked OK before it was relocated, and now its not, I would suggest that it has a gas leak. You may need to get the Tech back to check this..

Check the cooling liquid qty. I feel engine piston is seizing. Replace the engine coolant as per the manufacture's recommendation.

ill tell you right now whats wrong, your using the completely wrong oil

Probably if you change the whole engine. Remove the cooling system and replace the cylinder and head for ones with air vanes on. But that would probably cost nearly as much as a new scooter.,