At DCT, thiazide inhibit absorbtion of Na by inhibition of Na-Cl co-transporter.

You can see first aid USMLE STEP 1 (page 605).

Thiazide diuretics typically inhibit Na+ Cl co- transporter

in proximal segment

of DCT ,thus inhibit Na+ reabsorbtion and enhance natriuresis and diuresis.

Thiazide inhibit absorption of sodium at distal convoluted tubule

Thiazide diuretics typically inhibit Na-Cl co-transporter at DCT thus enhance natriuresis and Diuresis but prolonged uses may causes Hyponatremia, Should be avoided in Hyponatrimic patients