That setup sounds dangerous. An '040 should have a heat sink AND a fan. This is why they are not well suited for A1200 cases.
I use an 040 in my A2000 without any trouble, until the fan went up. It let me know right away there was trouble. As soon as I replaced the fan, it was back to normal operation. think how big that case is in an A2000.
An '060 actually works better in an A1200! More power, and way less heat!
