It is in the front
If it is a diesel engine it could be the glow plugs.
Probably in a removable housing at the engine end of the upper radiator hose
Just like any other car. All you need is the special hex-sided bit to be able to remove the plug from the bottom of the oil sump. Also remove engine oil-cap and dip-stick to help oil drain. The operation should be done with the engine warm. In this way draining will be more efficient.
Your engine might be the source of the problem, rather than the battery. However, only a mechanic could tell you for sure.
The engine number on an Opel Astra may be listed inside of the car manual if the number is not listed on the engine itself. Other vital information such as what kind of oil should be used is listed in the car manual as well.
It is in the front
i would like to know how many people fit in a vauxhall astra station wagon
how old is the astra? but more importantly what engine and gearbox does it have? early engines with certain manual gearboxes you can change the clutch without removing the gearbox and subsequently saving about 4hours labour time. otherwise it is a gearbox outjob.
what size engine i.e code number
There is no way to lock the crank on this engine. If you are replacing the timing belt, a special tool is available to lock the cams in position
The gearbox oil is separate from the engine oil on a 2002 1.4 Astra, and much thicker.
Read your drivers manual, the information you are looking for will be in there.
A complete Astra engine weighs around 350 pounds, or 158 kilograms. An automatic transmission is about 400 lbs or more.
Engine numbers can sometimes be hard to find. On an Astra, look on the transmission side under the oil filter housing on the cylinder block. You may need to use a rag, cleaner, or even a wore brush to remove any "gunk" that has accumulated on the plate.
The Saturn Astra does, but that's just a rebadged Opel Astra. The Buick Verano also does, but it, too, is a badge engineered Opel Astra.
I assume by 1342 you mean the firing order of the cylinders. By convention, cylinder number one is always at the crankshaft pulley end of the engine, so on the Astra, if you are stood with the bonnet open looking at the engine, cylinder 1 is on your left. Admittedly it does get a bit more complicated with "V" engines, but that does not apply to the Astra.