PAUL T Posted September 25, 2008 Report Share Posted September 25, 2008 My wifes' Uncle has a 99 Deville. It started overheating so they took it to a dealer who checked it for leaking headgaskets and said it was not the headgaskets. I think they pressure checked it. He had a new waterpump and belt put on. Tensioner is tight, coolant is 50/50 and full and the Fans are working. I haven't checked the hose into the surge tank yet. He claims that it only overheats when you drive it over 60MPH for less than a mile. He said as long as you keep it under 60 it does not overheat. He thinks maybe it is a plugged up Catalytic converter, but it seems to run just fine. The codes are as follows. Current Code P1483 History Codes B1327 B1350 B1147 B1148 B1152 B1161 U1000 Anybody with any ideas let me know and I will check it out. If I come up with anything else I will let you know. New info, it has a new radiator and the purge line is clear and the bottom hose is not collapsing. Link to comment Share on other sites More sharing options...
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