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This should probably be moved to the b15 forum but since I own one I will try to use old school logic. If the thermostat has been changed, and is working properly, then either your heater core has something blocked or the head gasket (which happens from time to time) is beginning to go. I am no expert but there are only so many things that keep heat from working. Email me if you don't have any success. Good luck.
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