Aluminum Radiator Leaking

[jhwkns]

Alloy radiators often fail due to vibration, although I've had good luck with them. I bought a HD 4-core radiator from Checker Auto Parts around 27 years ago. Did I mention that I love 'lifetime warranties'? They replaced the traditional unit twice for me. Upon needing a new replacement, the third one was aluminum with a single core. I wasn't thrilled but being that it was my only option for a free replacement, I installed it. My truck never ran so cool, and its 12 years old now and going strong.

If you put 'stop leak' in there, it'll likely plug up the heater core. Replace it if you can.