My car is a civic 06 si k20, so I decided to remove the radiator to reach, unplugged the top hose and bottom hose after flushing and then the coolant temperature center and fans. Did what I have to do with the starter for 30 minutes then I started to put the radiator back I plugged everything back fans sensors and hoses like they go. I added coolant and run the engine with the heater on, right away I noticed that my heater was blowing cold air and my temperatures were going high in my idle in was going low(car never felt so weak)fans are not turning on at all at this point so I went and changed all the relays and fuses, then I was told it can be the temp sensor so I went I put some new ones,fans not working yet, then I was told to check on the bottom and lower hoses to check if top is hot and yes top hose was hot and lower cold, so I went and bought new thermostat.then once again flush the coolant,added the new thermostat, added coolant to radiator, turn on the car w the heater on and nothing fans not working and STILL my new thermostat won’t open and the top hose is getting hot! Fans are good radiator not clogged, this car was running perfectly before I decided to take that stupid radiator on. And now turn to a **** show. Need good guidance