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If the motor is in the car use the vinegar not strait but 30 % water let it set a couple of days. Drain flush with washing soda. You may have to change the hoses and freeze out plugs any how. Just flush well

As far as cooling system I use cascade you can buy it in food store. Also check you'r air intake system, loose clamps, dirty air filter, try a garden hose from the engine side of the rad.

Doe's it have a turbo

gas or diesel

Some units will cycle if you have you'r heater controls are set on defrost