I've seem them fail in many GM trucks it seems this is due to vehicles that don't get the cooling system serviced and of course failed. On my sisters 07 Tahoe 5.3 with aux heater I service the truck and the fittings still look good with over 220,000 miles I just want to replace with either a great aftermarket or another set of OEM GM from the dealership since I have good experience with them. Personally I don't trust just cutting the how tugging it and putting a clamp over it, I did this with the transmission cooler line and no matter how tight it was still dripping. Of course it probably carries more pressure but I rather be safe than sorry the truck has never overheated and still running super strong except for the stupid rear main oil leak that I've seen in new GM truck as far as 15,000 miles.
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