Dear Omega experts, I recently changed the timing belt of my X20XEV and changed the water pump as well. As replacement parts I ordered the set “CONTITECH CT870WP2” from Contintal. The drained cooling water was clean and clear as with a new car; I also filled it up again with new Opel coolant and added it to the marking after the venting run (it is still constant after about 500km!). Now I noticed that the cooling water temperature varies significantly more than before, i.e. on the highway 140km/h there is a nearly constant temperature of just over 95°. After the descent the fan will then gladly rise to over 97,5 (rarely up to 100°) . But the worst thing is if after a longer journey still stop-and-go in the city comes to it: then I already thought the 100°. The fan will then run and the temperature will be cooled down so that the red range 110°(?) will not have been reached. Therefore, my question was offered to be less than the amount of water.