I have a question I change the thermostat to my car and when I leave it on the fans do not work and when I turn on the air if when I do not put the air the car heats up

 

today I change the relay and when it is on the place heats up when I turn on the air the 2 fans work and when the air is off the fans do not work

 

Seems like you struggle a bit with English, as we are struggling to understand what is happening.

Abandon the whole sentences, write in "-"

like what I understood is:
- you changed thermostat
- fans don't turn ON if climate control is ON
- if climate control is ON engine is overheating? or does fan come ON? not clear
- you changed fan relay, now fans are ON when climate control is ON
- if climate is OFF fans never turn ON

correct? Why change thermostat?