I just took my car in again for a heater core. This one has just over 10,000 miles on it. I have the Apten cooling mod without the restrictor, anyone else with this mod having issues with cores?
I really don't know. As memory servers me (not very well for the most part), My mechanic on the last one said it looked like a manufacturer defect because it leaked at a seam. I thought he said it was on the inlet or outlet tubes
Make sure your hoses aren't putting stress on the inlet/outlet tubes. The tube construction/seams aren't that strong and a hose putting constant pressure [pulling sideways or up or down] on them could cause them to fail prematurely.