1995 S10 p/u no heat

on these trucks if you have lost coolant in any way its very common to get air pockets in the rediculiously long heater hoses going in and out of heater core. when toping off coolant remove one of the hoses and make sure coolant flows out while someone fills radiator or resivor bottle if no radiator fill is avaliable.once coolant comes out quickly put hose back on and tighten clamp. Doing this will allow the coolant to flow through the engine and not create air pockets. START with that. its kinda like a bleed effect.

before doing all this a way to check if thats your problem feel the heater hoses. if they are not as hot as upper or lower radiator hoses when engine is normal temp.then they have air in them. all hoses should be somewhat hot to the touch. NOT WARM

good luck
Michael
ASE certified.