Checking the tightness of the system (Hyundai Elantra J2)

1. Wait until the radiator has cooled down (below 38°C). Loosen the radiator cap.

2. Make sure the coolant level is at the filler neck.

3. Install a radiator cap tester on the filler neck and create a pressure of 139.3 kPa.

While maintaining pressure for two minutes, check for leaks from the radiator, as well as through hoses and connections.

Warning. The coolant in the radiator may be very hot. Do not open the system while it is hot, otherwise boiling liquid ejected from the system may cause injury.

4. If a leak is found, repair or replace the relevant part.