Radiator pressure caps are an important component to the proper operation of your car have the cap inspected periodically, if it has failed get it replaced immediately. The OEMTools 24444 makes allows you to vacuum fill your coolant system in just minutes. If the level gets down to about 50 percent full, top it up with a fifty-fifty mix of anti-freeze and water. but my iO is an automatic, so Ive no idea where the filler is on the 5 speed. Most of these canisters are made from clear plastic making it simple to see the level. Search for new & used Mitsubishi Pajero iO cars for sale in Australia. As long as there is enough coolant, there is no room for air.Īs a responsible car owner, you should be keeping your eyes on such things as oil level, transmission fluid level, windshield washer fluid level, and the level of the coolant in the reservoir. The cap allows the liquid that was transferred from the radiator to the external reservoir to be pulled back. Air causes poor engine cooling and is the main cause of cooling system component corrosion.Īs the vacuum continues to build up, the two-way check valve, which is exactly what a radiator pressure cap is, goes to work. If there were not a radiator pressure cap installed, the system would draw in air. When the car engine is shut down, it begins to cool the coolant contracts. The design of a typical radiator cap is such that liquid is allowed to escape it does so by moving from the radiator to a reservoir. As engine temperature increases, the coolant temperature increases as well, if the temperature exceeds the norm. Never lose sight of the fact that a liquid expands as it gets hotter. On the other hand, if the pressure was allowed to increase above 16 PSI the cooling system, including the hoses and even the radiator, could simply burst or even explode if the conditions were right. If there is no pressure in the cooling system, the coolant will boil off. Most radiator pressure caps keep the system pressure at 16 PSI so the engine coolant can get considerably hotter without the fear that it will boil off.
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