Your car overheats but doesnt lose any water is it an airlock or thermostat and if thermostat is it hard to change on a p reg vectra 2 liter injection?

Answer 1

I would check air lock first as it's cheaper and faster:

1. Remove the cover from the expantion tank as you would normally do when you want to add some more coolant.

2. Start the engine and wait for temperature to raise.

The level of your cooling liquid should be raising as well. If there is some air in the system it will start coming out around the point when engine temp will reach normal operational temp. If air will get out replace it with coolant and close the expansion tank back.

It is generally a good practice to finish filling up the cooling system when the engine is hot - saves from possible ai problems.

If it is not an air lock you'll have to go with the more expensive option - thermostat.

It's not so hard of a job if you've got aircon fitted, harder if you don't. There are numerous guides online on how it's done.

There is a known fault caused by corrosion of the thermostat connectors, so you might want to look in to that as well... Just a thought. Saved a thermostat this way once by keeping it in coca cola (acid removes all rust) over night and spraying with WD40 afterwards.