I know this is semantics, but I just wanted to clarify the point. Just as a note, the thermostat won't keep combustion gases from entering the cooling system, it just won't circulate the gases forward to the radiator, but rather just run them around inside the engine instead. Just keep an eye on it and make sure it doesn't overflow. ![]() Since you don't want to open a hot radiator, it only makes sense to have the cap off. You need to get it up to temperature before using the tester. Yes, run the car without the radiator cap on. If you have an expansion tank, hydrocarbons in the cooling system will wind up here as well, so testing there will be as conclusive as if you were actually testing off of the radiator itself. Any indication of them (where the testing fluid turns from blue to green or even yellow), it means one or more cylinders is leaking into the cooling system and there is an issue. If the engine is sealed correctly, there WILL NOT BE hydrocarbons in there. The way these testers work is they test for hydrocarbons in the coolant system. If the system you are working on has a sealed radiator, with an expansion tank instead of a surge tank, with the only working pressure cap on the expansion tank, then yes, insert the tester in that opening instead. Now I am wondering if such upward movement of coolant is expected for BMW X3 or if it is sure indication of a blown head gasket? If it is expected then would this car be rather tested with two-level tester where coolant would be less likely to enter the second stage? The coolant level was so low that "low coolant" light was on in the dashboard. However, I think I actually contaminated the test fluid because after thermostat opened there was quite strong upward movement of coolant. UPDATE#1: I tried to do the test according to the instruction. Just to confirm - in this case should I put this tester in coolant reservoir neck instead of the non-existent radiator neck?ĭo I need to run the car without radiator (or reservoir) cap and wait until the engine gets hot enough so that the thermostat opens, because, otherwise, the thermostat may prevent combustion gases from entering the cooling system?Īny other precautions I should take with this test besides the well-known one - don't take off the radiator cap if the engine is already hot? While the instructions say take off the radiator cap and insert tester, it appears that at least some cars like BMW X3 2008 and Chevrolet Aveo 2007 don't have radiator cap per-se. I have a few questions regarding its usage: Whether you are leak testing radiator caps, tanks or the whole assembly, ATEQ can work with you to verify testing specifications and provide efficient leak testers and flow meters for radiator systems and develop integrated radiator leak testing solutions.Ĭontact Us to speak with an expert ATEQ applications engineer in your area.I bought this cooling system combustion leak tester. ![]() ![]() These tanks play an important role in in the radiator system and need to remain sealed, so leak testing inlet and outlet tanks is essential.ĪTEQ has developed solutions for hundreds of different radiator and radiator component leak testing applications for well known automotive companies over the last 40 years. Coolant is pumped through the engine, hoses and the radiator and it eventually enters and exits the radiator by collecting in the inlet and outlet tanks. Pressure cap leak testing is necessary because a faulty pressure cap can expel hot coolant causing serious burns. A pressure cap keeps the car’s coolant system under pressure by allowing coolant to become hot. Many of these radiator parts require leak testing.Ī radiator core consists of a large metal block with small metal fins that allow the coolant to vent heat by expelling it through the car’s grill. ![]() Radiators contain several components such as the: core, pressure cap, inlet and outlet tanks. It is important that radiator components and assemblies are free from leaks.
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