Ive done the same job as you mate on my wrx bug, i washed out my new rad into a bucket to see if anything came out but the water was crystal clear with no signs of grease or oil. I did get a few chunks of crud but found that they came from the header tank where bits has got stuck to the inner walls over time and loosened when i changed everything.
...im no mechanic but arent these suppose to have the red/pink coolant? Thats what i was told anyway and was told not to use the blue stuff. As i said though im no mechanic by any means haha
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