The cooling system capacity for a 1.7 TD Astra typically varies by model year and specific engine specifications, but it generally holds around 6 to 8 liters of coolant. It's crucial to ensure the system is filled to the recommended level and to use the appropriate coolant type as specified in the vehicle's manual. Regular maintenance, such as checking for leaks and ensuring the radiator and hoses are in good condition, is essential for optimal cooling performance.
could be you rad is half blocked. try flushing the system with rad flush. you get this from and good car parts retailer such as halfords. hope this has helped
very simple to replace the starter on this engine, first disconnect the battery then after jacking the car up (easier from underneath ) locate the startermotor it is just under the manifold bolted to the gearbox it is around the size of a coke can. unbolt the three bolts and disconnect the two wires going to the starter the bigger one being the live feed from the battery replace starter with new one three bolts back in ,wires connected, battery back on job done good luck