Radiator leak on our 2014 Suburban with 102k miles. What seemed odd is that it was still dripping after sitting for 3 days and not any time before. Hoses were clean but I could not see into the radiator/hose connections. I didn't have enough time to dig further and won't be able to look for several days.

I tried to search and the only thing I came across was someone mentioning that their radiator may be under too much pressure? Are these radiators known to leak?

 

If you have a good and correct radiator cap on the truck, it will not build up too much pressure. How much coolant are you loosing?

 

Haven't figured out how much loss yet. After 3 days parked on our driveway, it left a mark of about 3 dinner plates and was still dripping.

 

If still dripping, you should be able to confirm leak is in radiator and not hose related. All radiators leak sooner or later, ours on 2005 Yukon exploded the driver side plastic side last year at 200K.

 

I would check for a cracked end tank on the radiator. Not sure who thought it would be a good idea to make radiators with plastic parts. The end tanks can be replaced however but I don't know how that cost compares to replacing the entire radiator. One of the end tanks on my 87 IROC Z cracked when it was about 10 years old.

 

"If" I was going to have a radiator shop repair my radiator, I'd get ALL the plastic parts replaced, as other side could be weak as well.

I got a new radiator my my 2005 Yukon at Autozone in a small town last year, installed readily by me, after the driver side plastic end exploded. Recent information reveals that Yukon may have had a small leak in the firewall quick-connect fitting or the water pump, and leakage could've caused the Yukon to run hotter than optimum.