![]() (It is good practice to bring the old radiator cap with you to be sure you are purchasing the correct part. Make sure you know the year, make, model, and engine size before you head to the parts store. (7) Install the old cap if it is still good, or if necessary buy a new radiator cap. It may lose some pressure, but should not rapidly lose a good amount. (6) Pump the pressure tester handle until the pressure builds to the manufacturer’s specification. (5) Attach the adapter with the installed cap onto the pressure tester. (4) Attach the radiator cap to the pressure tester adapter. Coolant may come out when you remove the radiator cap, so it’s best to be prepared for this possibility. (3) Place a catch pan under the radiator. Despite the cooler hose temperature, however, extreme care should be paid as there may still be hot pressurized coolant in the system. If the radiator hose is cool to the touch the motor has cooled down and you can remove the radiator cap. Do not attempt to remove the radiator cap while the system is hot, or injury may occur. Keep in mind that if the system is hot, extreme pressure and heat are at play. Carefully touch a radiator hose to determine its temperature. (1) Make sure the cooling system is not hot. In order to pressure test the cooling systems of specific vehicle makes and models, appropriate manufacturer adapters are required. ![]() The pressure of a cooling system is controlled by the radiator cap which generally holds the pressure of the system between 6-16 PSI and keeps the temperature in check.įJC Radiator and Radiator Cap Test Kits come with everything you will need to pressure test most vehicles (including the caps). Normal operating temperature of a cooling system is around 220 degrees Fahrenheit, which is slightly higher than the boiling point of water. The seals should be inspected for damage as the heat cycling could cause the seal to harden the rubber. Some water pump of the overheated vehicle is bad, but some is good.As the coolant in your cooling system increases in temperature, the pressure in the system also increases. Testing a radiator cap can be done in just two easy steps which include: Removing the pressure cap when the system is cool and when the engine is not running. Next objective is find out the root cause and solve/reduce the overheated case.ĭoes cylinder compression test help to detect the leak? I got two objective for this project, I wish to know detect the overheated problem earlier through some equipment testing. That why I asking this question here cause I suspect my testing step is wrong. I do some experiment to those overheated vehicle, pump the pressure to 16 psi and wait for 10 minutes, record the pressure reading for 2-minutes, 5 minutes and 10 minutes and compare it with the new car reading.īut look like not much different between it. So I wish to do the coolant pressure test for all vehicle wish reached or exceed 250,000KM.īut I found that if I follow the step that I mentioned in the 1st post, I just able to detect the external leak but not internal leak. We do not have any cold season here, the average temperature is about 86-100F. (180,000 to 350,000Miles)Īll coolant was fall below min indication line, some tank was empty.ĩ0% of the engine head gasket was melted. The mileage for the vehicle mentioned above is 300,000KM to 550,000KM. The age of those vehicle is about 0 - 2.5 years old.īut I found that there got around 30 units engine got overheated since June 16. We have about 1700 units of Toyota Prius (ZVW30), Asian Model. I'm newbie in automotive industry and just join a city cab service workshop few week ago. Sorry for late reply guys and Thanks for the help.
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