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Hi. I'm using my car for 2 hours a day. Next day I'm opening the coolant tank cap, it starts to sound "ssssss" and coolant level rises to normal level. Everyday its same. I tested my head gasket with Würth Co2-leak tester, and there is no leak, so head gasket is okay. Someone told me that EGR Cooler can cause problem like this. Btw when i start driving, depending my driving style; coolant tank cap leaks as very little drops. And my coolant color turns orange, at first it was pink. Should I change EGR cooler? Or water pump? I'm confused can you help me? Thanks a lot.


Sorry for my bad English. My car is Opel Corsa 2006 1.3 CDTI (diesel)
 

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I think you will find that is normal, when it gets hot and the pump is turning you get pressure in the cooling system, that forces the level of the coolant down, then when you release the pressure it comes back up a bit that's nprmal, as long as it doesn't use any coolant....as for water leak that could be anything...prob pump...Fred.
 
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