I Just Bought A 96 Accord For 300 Bucks When I Got It It Was Over Heating I Replaced The Fan Motor, The Thermostat, Fan Switch, And The Temp Sender On The Head And The Car Still Overheats. The Temp Gauge Reads To A Certain Level Then Doesnt Move. When You Turn The Car Off It Stays In The Same Spot............ So I Wake Up In The Morning And Its Back To Normal. The Check Engine Light Blinks Non Stop In Idle, And In Third Gear. I Have Seriously Tried Everything That I Want To Tackle On My Own. Now I Was Wondering Could It Have Anything To Do With The Ecu. This Is My First Post So If Anyone Can Please Help Me I Would Appreciate It.

 

ECU is perfectly fine. most of time on a 96-97 accord when you see the D3 or D4 blinks, that mean that you are having problems with the shifting selenoids. B4 u take that out and replace it, check and look for a fuse that is call alt speed sensor. most of the time it can be the fuse. On your temperature gages.. Your gages is probably mess up.. someone try to take it off and try to mess with it.. the needle is probably stuck somewhere.. OVERHEATING PROBLEM.. you can change the fan the radiator or watever.. itll still do the same thing.. If you are using a aftermarket radiator cap, what you need to do a little modifying on your cap. the seal/gasket is what making the car overheat. cut off the bottom and center seal. it will help alottttttt.

 

Check Engine Light then get the code from autozone is free or any other place will charge $15 or you can search more here n han u will find how to get the code urself.
for overheating make sure you change all the main relays and check all the electrical fuse.