I just bought this 1991 Volvo 240 as a first car for my son, and he is stoked. However an issue that we are encountering is that there is a leak from what I believe is the transmission cooling line that goes into the radiator. Have you guys ever seen this set up? Any ideas on how to fix this leak? The leak is coming from that top brass fitting. It leaks when we press down on the accelerator. Please help if you can! Thank you so much.