If you replaced your waterpump and used your old thermostat, potentially that could cause problems. There are two styles of updated pumps - one has a 4.5mm ledge and the other a 7mm ledge. Here's an old thread that explains it:
http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/603920-qriginal-updated-water-pumps-timing-belts-whats-difference.html
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83 944 NA - Black on black
86 951 - Red - SOLD 7/21
16 Ford Expedition
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