Hi! i recently installed another d16 in my civic 99 dx, also i took the block heater from the other car cuz air fonctions didnt work... anyway all seems to runs ok, but for the heat to come, it wont heat up in idle, heat engine gauge is at half way and still cold air coming out, need to drive a lil for it to comes, but the weird thing is each time ill make a stop or hit fast speed fast , the air comes from hot to cold and then 2 minutes after comes hot again, cant be the termostat if the gauge works fine at mid way right? so might be the heater core? water pump? sensor? help please

 

This is the engine management and tuning forum. What made you think your thread has anything to do with tuning? Moving to Tech.