We are trying to remove the lock cylinder to replace, but can only get the key in halve way. It is a 2001 Daewoo Lanos. Already have the new one, we are worried about damaging the column and leary about ''tapping''the key in farther.

normaly you don't have to force a key to turn no car was manufacture that way you probably may have a stiff ignition key i would advice you unhook the ignition key for replacement or service

1,3,2,4 it is a four cylinder correct

if there is a computer chip in the original key you will only be able to get a new one from the dealer, if the new key you have turns over the engine ,but it won't start then you need a dealer key. Only try to start the car with the new key once though if you try it too many times the car will shut down and the dealer will have to reset your computer for you to be able to drive the car.

snapped key into what lock cylinder or ignition switch or do you have both ends of the key itself or not ?

if you have one end stuck in either lock / ignition cylinder you can try using a welders torch cleaning tip kit it contains many various sized brushes and files etc which will allow you to get in beside the broken end of the key and wiggle it out .,,,any parts store should have them ...

You have clean the surface all parts and replace the seals so is the one way that not leaking, If you thermostat housing has two parts ot metal, if not, you have to buy another one with the housing more.

Check your key immobilizer, i had a similar problem with my Lanos.
If you turn the key and your red light keeps flashing in the centre console your imobilizer is not turning off.

the problem lies in the drivers side operating switch for the central locking .this would involve removing the drivers side door handle and checking the switch mechanism thats built into the lock,havent done one o n this model only a opel astra ---but they are different from the opel although the car looks the same ,well similar pull it off have a go ,the key barrel must turn something so look for an internal switching or external switching and see if the spring is ok that returns the switch

Remove the wheel ,then track end ,brake caliper support ,the pinch bolt that holds housing to the strut ,lower track control arm swivel.pull off and place on bench .knock the centre hub piece out and on the inside of the housing is a big circlip that holds it in .Then take to a garage and have the old one pressed out and the new one pressed in.stripping shouldnt take more than 35mins ,visit to garage for the pressing?? allow 2 days --- refitting max half hour

turn on radio remove the negitave battery cable wait one minute it will reset >>
hook cable back up>>
hope this helps

Do you feel a misfire?? Random misfires are usually caused by a lean fuel mixture, the reasons that cause this a to many to list here.