Question about Cars & Trucks
An engine should not be allowed to boil. Everytime it boils it will be causing damage. You should not be driving the car until it is fixed.
The fact the boiling is intermittent points to an intermittent failure of the cooling fan to operate, though could have other causes - such as a dirty corroded cooling system. Particles of rust and dirt circulating can temporarily block important coolant and degassing ports. If the system isn't degassing properly then gas bubbles can become trapped and disrupt the thermostat operation.
If the cooling system wasn't dirty before it started boiling it probably is now.
I suggest you begin by thoroughly flushing the system with as much manual/visual checking and cleaning as possible paying particular attention to the smaller vents and ports. Ensure the thermostat is in good order and if possible fit a vented type. Fit a new pressure cap if there is any doubt about the effectiveness of the original. Once that is done it will be time to test and rectify the original fault if it still overheats.
Posted on Apr 22, 2017
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Posted on Jan 02, 2017
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