Overheating.had broken hose. replaced hose still overheating

Might be the water pump! Take it back and tell them they need to do it right.

check the thermostat

Verify the sending unit is correct. Verify it is overheating. Sometimes the sending unit and/or gauge is bad.

The Daewoo range of cars have two main problems with cooling system the thermo switch under the coilpack (2 pin) very rarely ever works properly over 20 c this means that your fans do not switch on when the car is hot, easiest way to check switch aircon on and the fans should work , if they don't .replace with an after market switch and relay can be bought from parts accessories stores , the radiators are by far too small they can be replaced with minor fabrication ( sheetmetal) by a Vt-Vy radiator v8 is best in all cars for overseas the Pontiac 2001-2006 check your measurement and with a couple of new hoses and a extension to the bottom hose the over heating disappears if there is milk coloured oil under your oil fill cap your head or possibly motor may need to be replace the best engine out of these engines is either the c20 sel or the c22sel

it is overheating. low on coolant/ thermostat stuck shut? see if both radiator hoses are hot.

Sounds like you have a faulty head gasket or maybe a cracked head.This can cause overheating and the check engine light to come on.The code for the o2 sensor is probably caused by coolant getting into the exhaust system and coating the sensor.The coolant fan may work but it cannot remove enough heat from the rad to make the engine cool off.Try some engine coolant stop leak to see if it will help.This maybe only a temperary fix.Let me know if you need more.MOE

The temp gauge being erratic should have been your sign. Are you sure its overheating or are you going by what you see being registered on the temp guage.Also after doing work such as water pump sometimes you will get air lock in the system you need to bleed the system after performing such a job. If the temp gauge is bad you need to replace it.

use 50/50 mixture of coolant/water, use synthetic oil or no more than 5w 30. Change thermostat, make sure fans come on when idleing, otherwise change relay

looks like you have done everything but the problem with your car is that the cylider head gasket has gone have a look at the dipstick or remove the oil filler cap if it looks like mayo then 100% head gasket has failed you said no water on the floor so it must have gone into engine only way this can happen is head gasket failing, if you have put lot of water in to the cooling system then your sump will be full of oil water mix.

let us know your findings so we can help you more if you need it

First, plastic tube may be the overflow vent from the coolant bottle.Check to see where the attached end goes. You are going to have to check engine for coolant leaks (carefully refill system without spilling anything, then look for dripping anywhere. Look for leaks from all hoses, fittings radiator, water pump etc) After checking for leaks, start it up and check again (watch where you put your hands though) While running, check that the fan comes on when the vehicle reaches operating temp.(no fan, check fan motor, sensor & relay) Turn the heat on (does it have heat?) Check temp of lower hose and upper hose. If overheat happens, is lower hose still cold? (likely bad thermostat). If you found a leak, replace whatever is leaking...best insurance is to change thermostat after any overheat. Last, is there any white smoke from tailpipe, does engine run rough? If so, could be a failed head gasket or crack in cylinder head. (at this point last thing to worry about unless there is excessive smoke or rough run or oil in radiator or coolant in oil).