1978 overheating boiling in radiator

[stavel]

My 78 is overheating. I can hear the coolant boiling i the radiator. Any idea what causes this?

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[Frankie the Fink]

Well as a first step check your anti-freeze ratio, then check your radiator cap....

 

[74 Harley]

And when you get done with that check your belt tension. Make sure the radiator fins aren't plugged with dirt. Have you changed the thermostat lately? Maybe even time for a new water pump, if the coolant isn't taken care of the pump vanes can rust away. And it's possible that your radiator itself needs service, having the tanks removed and rodded out.

 

[Frankie the Fink]

And when you get done with that check your belt tension. Make sure the radiator fins aren't plugged with dirt. Have you changed the thermostat lately? Maybe even time for a new water pump, if the coolant isn't taken care of the pump vanes can rust away. And it's possible that your radiator itself needs service, having the tanks removed and rodded out.

Gads, do shops still do that ?
Also, I don't know if these cars have a fan clutch but make sure its working....