1975 Buick Century radiator drains coolant reservoir every

1975 BUICK CENTURY
116,370 MILES • V8 • 2WD • AUTOMATIC
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MUSTANG8366
  • MEMBER
  • 1 POST
One month ago, I replaced the thermostat, hoses and put a brand new radiator into this 1975 Buick. It has been fine since then. Two days ago, the temp light came on. the coolant reservoir, which had always been right between add and full, was dry. I filled it with coolant and it drained it into the radiator now a total of 4 times. Since the first incident, the temp light has not come on and it runs fine but still is draining the reservoir every time I fill it up. When I check the radiator, it is full to the cap. I filled the reservoir with plain water last time and the water is now on top of the radiator. Any suggestions on what is going on?
May 16, 2010 at 11:43 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Have you checked closely for a external leak? Also, check the motor oil to make sure it isn't mixing due to a bad head gasket. Finally, pay attention to the exhaust to see if the exhaust is white.

Let me know what you find.
Jun 7, 2010 at 1:25 AM
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