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Sounds like either the

thermostat is not opening and needs replacement

or head gasket is bad

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16y ago
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Q: Why would 1989 Sundance When you drive it 3 or4 miles pressure builds in the radiator and pressure pushes the fluids into auxiliary holding tank This fills where the fluid is lost through the overflow?
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Is the radiator cap and overflow bottle cap the same thing?

If the engine coolant reservoir has a thread on cap , that is your pressure cap / " radiator cap "


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