WTF is wrong whid this engine

I have a problem i newer had to do whid before its a 98 honda civic aerodeck 1.5,it runs grate but whid the termostate in the engine theres no heat in the cab and if I remove it iv got all the heat i need,iv flucht the hole system and the waterpump is new as the termostate,no coolent is disapering and normal pressure in the system im pulling my hair