![]() Never open the cooling system when the engine is hot.Other items to remember regarding the cooling system: If the pressure does go down, then you need a new cap. If the pressure does not go down, then the cap is in good shape. If no leak is immediately noticeable, then it doesn’t hurt to leave the pressure applied for a few minutes. If there is a leak, then it may be more immediately noticeable. Pump it by hand to the pressure indicated on the cap, the same way it was performed when pressure testing the cooling system. You’ll apply the adapter to the tester, then the radiator cap to the adapter. There should be an adapter that comes with the set. If there is less pressure than before, then there is probably a leak.Īfter attaching the pressure tester to the cooling system, you’ll also want to pressure test the radiator cap. Then inspect the entire cooling system for any leaks and check the gauge on the pressure tester for a change in pressure. Let the vehicle sit with this pressure for 20 – 30 minutes. Typically on a modern vehicle this pressure is between 13 – 16 psi. Generally, it attaches to the radiator where the radiator cap goes, and you pump it by hand until the pressure on the gauge matches the pressure that is written on top of the radiator cap. If you don’t own one, then rent one from your local auto parts store. You’ll use a cooling system pressure tester. The pressure test can also be done any time a leak is suspected. This is commonly the next step after performing a cooling system flush. Standard Checks at 30K, 90K, 150K MilesĪny time you open the cooling system and put it back together, you’ll want to pressure test the cooling system to check for any leaks.Pressure releasing means the pressure tester can be removed.įix cooling system parts yourself like the radiator, thermostat, coolant reservoir, water pump, and more with many videos for different makes and models in 1A Auto’s video library. Twist the connector counterclockwise and unlock it. Inspect parts like the radiator, upper and lower radiator hoses and hose clamps, water pump, thermostat, heater core hoses/firewall, head gaskets, intake gaskets depending on the engine, and the interior carpet near the firewall for leaks If the level drops significantly, there is a leak. If the system holds pressure at the set pressure on the gauge, check the gauge over a span of 30 minutes and see if the pressure has dropped. The slower the gauge drops, the smaller the leak. ![]() If the pressure gauge drops quickly, there is a leak. Most cooling systems’ pressure measures between 13 and 16 psi. Keep pumping the pressure tester to apply pressure to the cooling system without going over the system’s psi number on the radiator cap, which the pressure tester’s gauge measures. Apply Pressure to the System without Exceeding the System’s psi by Pumping the Tester.Check the Radiator Cap for the System’s psiĬheck the radiator cap to see how much pressure to apply without going over this number.Push down and twist the connector clockwise until you feel it click and it locks in place Tighten the coolant pressure tester to the adapter or the radiator or coolant reservoir. If you need an adapter and your coolant pressure tester kit has one, connect it to the radiator or the coolant reservoir. ![]() If applying the tester to the radiator, remove the radiator cap once the system is cool and depressurized. If you plan on removing and fixing a part, add water to not waste coolant since the system will be drained and refilled If the coolant level is low, add water or coolant to raise it. Steps for a Coolant or Radiator Pressure Test
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