Get a sniff test done. This tests for exhaust gases in the coolant bottle. I suspect the head gasket has failed between one of the cylinders and a waterway.
If you are mechanically competent you can buy your own kit, with enough test fluid for dozens of tests, for the cost of one test at the garage!
http://www.tools-n-all.co.uk/Universal-BT500-Block-Tester-Kit/?gclid=CN3uv97J0J0CFdBb4wodlA1OsA
Google "block tester" for more.
vaux
October 2009
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