In 2000 the company produced vehicles with 2.9 engine having code of XFX (ES9J4S). There is no chance 2001 607 engine will work efficiently with bad cooling. It’s important to provide cooling for Peugeot’s engine with 2.2 liters volume. It’s important to use 7.4 liters of coolant which has Red color. There are some conditions in servicing cooling module at Peugeot 607.
2.2 607 motors of 2003 year will serve more by optimal service. To endure car life take only Red antifreeze and pour not more or less than 7.4 liters. So better use Peugeot’s advice for servicing 2002 607. A lot of XFX(ES9J4S) motors are used long in Peugeot cars but only with good service.