Keffer inc Posted February 21, 2016 Share Posted February 21, 2016 Hey everyone. I had a tiny leak up high where the upper hose connects to the radiator. So I drained all the coolant and made my repair with JB Weld. But now I refilled the coolant and while idling to check for leaks and to make sure the're are no more problems, my truck is running hot. Temp gets about halfway to red. Coolant remains full, truck temp is hot, the heater core is cool, the radiator and lower hose connecting to the oil cooler is cool. Upper hose is hot, oil cooler is hot. I disconnected the heater core hose to check for an air pocket, but only got hot coolant. Any Ideas? I'm working on my 1999 Mack CH613 with the 355/380HP E7. Quote Link to comment Share on other sites More sharing options...
alex g Posted February 21, 2016 Share Posted February 21, 2016 Sounds like you got a air lock . I always let truck run for a while after filling rad with no rad cap. Sent from my SM-G386W using Tapatalk Quote Link to comment Share on other sites More sharing options...
MACKTRUCKS4 Posted February 21, 2016 Share Posted February 21, 2016 If not air locked, make sure no one put a rag inside one of the necks to keep dirt out and it was never removed. This happened to a friend of mine and drove him nuts until they found it. Quote Live every day like it's your last, because one of these days, it will be. Link to comment Share on other sites More sharing options...
Keffer inc Posted February 22, 2016 Author Share Posted February 22, 2016 I did the repair myself, no rags where stuck in the radiator. I did run the truck without the cap (cap on bottle mounted to the firewall, No radiator cap on Rad itself.) Is that maybe where I went wrong? I'm waiting for the truck to cool off to try with the cap on to see if it needed 10+ psi to build up or something. I also have a radiator testing kit where I could pressurize the system with a hand pump? Quote Link to comment Share on other sites More sharing options...
Keffer inc Posted February 22, 2016 Author Share Posted February 22, 2016 Update: I put the cap on and seems to be working now. I figured I needed to keep the cap off to add more coolant but looks like that`s what I did wrong. All the normal functions seem to be back. Thanks for the quick response. Quote Link to comment Share on other sites More sharing options...
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