Honda City 1986 Overheating

Im selling this car on trademe at the moment, i let someone test drive it and they didnt put the radiator cap back on properly, driving home the car overheated. i have done a radiator flush, refilled the radiator and took it for a test drive but its still overheating. Im stuck at what the problem would be any ideas from you knowledgable people will be great.

air-lock or a stuck shut thermostat. or you dont have cooant in the radiator= blocked up system or no waterpump impellor now due to corrosion

Air in the system, fill slowly from cold with the cap off and the motor running to allow the air out and put the heater control on hot.

Never done a city so have a look around for anything that looks like a bleed point in the cooling system, if there is one that has to be released and then start the fill process until coolant is flowing at the bleed point without any obvious air in it, close off the bleed point and then continue with the filling and bleeding at the cap, replace cap and run up to operating temp and shut down engine, make sure overflow bottle has plenty in it and allow motor and cooling sytem to cool while sealed and then recheck the level in the radiator. You stiill may have to do a little bleeding at the second check.

Turn the heater fan on and use the air coming out of the heater to tell you that you are getting coolant into all of the system, no heat from heater means no coolant reaching heater core.

Motor must be cold or at least cool, do not try to bleed cooling systems on vehicles while the engine is hot or it will do all sorts of weird and wonderful things that will put you crook.

Thanks for the advice ill give it a gotomorrow

Shouldn't have spat all water out / overheated from no radiator cap, wonder what the test driver got up to.did you go with them, if not do so next time.

Fill radiator from cold to brim, without cap on start engine and observe filler neck, if geyser ensues = blown head gasket. If nothing then probably faulty thermostat.

Silly question but why do you think it is overheating!

OP how did you flush your radiator

I think its probably thermostat, top radiator hose is hot but bottom one stays cold dont know what that means though.

Drained radiator, then shoved a garden hose in it for 5 minutes to flush it , then refilled with coolant and water.

And what is temp gauge reading all this time!

If gauge is reading "normal" then either radiator is blocked / water pump issue / air lock somewhere.

take your radiator out and get it rodded its blocked dont buy a radiator flush it wont work. Have you used a stop leak product in it !