Looking up the specification for this particular vehicle it should run a 16lbs pressure cap. Is the 1 missing from the six? Six is a really low pressure and I haven't see a cooling system that uses that low of pressure. As the engine is warming up the pressure in the cooling system continues to increase so a low pressure cap could cause the cooling system to depressurize premature allowing the coolant to boil and over flow. The cooling system must be pressurized in order to raise the boiling point of the coolant (like a pressure cooker in the kitchen) to operating temperature for the engine to be efficient.
A nation wide auto part supplier often rents out tools for a fee that often get reimburse in full after returning. If you can ask for a cooling system pressure tester it will apply specific pressure to the cooling system and pressure cap. This tool is used to identify leaks, so if the cap will not hold enough pressure, then it is bad.
Saturday, August 24th, 2013 AT 6:56 PM