its probably being caused by the ww. I've had the same thing happen with Super Lube. I've heard of others having it happen with ww. Is your system closed or open loop? If you let it run for a while it should get all the air out. Once the air's out, you shouldn't have anymore foam.
__________________
water cooled
1.4 tbird @ 1580 143x11 vcore 1.88 vio 3.55
|