@ad33l123
Dear ensure that proper coolant is in use instead of water, fan should be on Auto instead of direct, and brand new T Valve installed.
1st ensure these 3 things, and then check that whether needle comes in the middle or not.
If after doing all these things, the needle still remains near C, and does not come in the center, then other issues might be there which need discussion, but 1st, ensure these 3 things.
I hope, it helps and guides. Thank you.