Overheating and/or Noise

Restrictions in the cooling system can cause engine overheating and/or cooling system noise. Components prone to this condition are the cylinder head, water pump, block, thermostat housing, and inlet manifold. Symptoms are:
^ Engine may make snapping/cracking noises.
^ Heater core may gurgle or surge.
^ Radiator hoses may collapse and expand.
^ Heater hoses may vibrate and thump.
^ Overheat lamp may or may not come on.