Either you have low coolant, defective cooling system (bad radiator) or a blown head gasket (or all of the above).
Low coolant.
you have a blown head gasket
FRICTION
Too much heat.
If you mean engine coolant is getting into the car, the heater core is leaking coolant causing the coolant level to drop and that causes the engine to over heat.
slavery
The car will over heat.
when the car starts to over heat
what causes a Honda CRV to over heat
It generates heat (from kinetic energy of the car).
If you don't shift it!!!
#1 cause Heat, #2 Heat, #3 Heat, #4 Sulfation usually caused by electrolyte loss because of heat.