snw blue by you Posted January 14, 2008 Share Posted January 14, 2008 Has anyone seen these leak from anywhere else besides the radiator? Got one that is losing coolant, customer says tracks down LS frame rail behind tire, pressure tested, however, unable to see a leak. Noted back side of LS tank above fuel cooler was wet, so I ordered a radiator( and removed it today. Good points in the other thread, but first one will probably end up flagging around 3 hrs maybe less. Just looking for additional input Quote Link to comment Share on other sites More sharing options...
Tony302600 Posted January 14, 2008 Share Posted January 14, 2008 I have had around 10 trucks (mainly 6.0's) that would not leak coolant until they sat overnight outside in the cold. Every single one had low coolant, sat in the warm shop overnight lost maybe 1psi of pressure. Now put it outside in the cold, and it would lose all pressure overnight and have a puddle. Just a suggestion for ure truck. Quote Link to comment Share on other sites More sharing options...
Aaron Posted January 14, 2008 Share Posted January 14, 2008 We had one leaking at a bypass tube out of the top of the front cover, almost directly underneath the egr throttle business. The bolt had broken off in the cover. HTH. Quote Link to comment Share on other sites More sharing options...
GregH Posted January 15, 2008 Share Posted January 15, 2008 I had one that I thought was the thermostat housing seal. Turned out to be the upper radiator hose to thermostat connection... Manifested as a minor leak just left of center on the crossmember.. Quote Link to comment Share on other sites More sharing options...
slim Posted January 15, 2008 Share Posted January 15, 2008 Had one today that was leaking from the left side upper part of the radiator in the front where the crossflow tubes are soldered to the side tank part. It was the very top tube and I was pumping and pumping till my arms went numb but couldn't get it to build pressure or leak on the ground or out the exhaust. I was just pumping air straight through the air bleed hose on top of the radiator and across. I found the leak when I filled the coolant reservoir all the way to the top and then pressurized. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted January 15, 2008 Share Posted January 15, 2008 I recently had a 6.4L with low coolant that I had already replaced the radiator on. The customer was complaining about the white smoke issue so I was looking over the entire truck. Noted low coolant and discovered that white coolant crud everywhere in drivers side of the engine compartment. Long story short, I used dye in the coolant and found both EGR coolant hoses leaking due to loose clamps. Should you discover the same, the clamps look impossible to get to but once you figure it out they are actually easy to get to and tighten. I resorted to dye because like you, I did not verify the leak by pressure testing. Put coolant dye in it and drive it. Give it at least one thermal cycle. If it is running down the frame rail it might just be the EGR hoses! Quote Link to comment Share on other sites More sharing options...
snw blue by you Posted January 15, 2008 Author Share Posted January 15, 2008 Thanks. Just an update. When I got the radiator out I found coolant tracking inside the fan shroud, on the LS CAC tube, fuel cooler hoses, LS frame, and LS battery box. The coolant track inside the shroud starts from the top left corner and tracks down towards the fan so I gotta' believe its leaking from the radiator, maybe even from the core, as the tank is outside the shroud (although I did not see any damage to the core) but that does not mean it would not track that way from a bad crimp. When I refill this one I will install dye for the future. Thanks for the input. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted January 15, 2008 Share Posted January 15, 2008 When I refill this one I will install dye for the future. /forums/images/%%GRAEMLIN_URL%%/whattodo.gif DON'T DO THAT! /forums/images/%%GRAEMLIN_URL%%/whattodo.gif If you put dye in it and it springs a leak in the future, there will be dye EVERYWHERE by the time you get it. It has been my experience that it is better to install dye during the diagnostic process and catch the leak as soon as the dye begins to show. I call that pinpoint leak diagnosis. /forums/images/%%GRAEMLIN_URL%%/wink.gif The dye left over after a repair can be diluted by discarding the coolant drained to make the repair which is also desirable to keep the coolant color from being too green. The Tracerline coolant dye will turn gold coolant green which can cause confusion where maintenance is concerned. Quote Link to comment Share on other sites More sharing options...
Mekanik Posted March 4, 2008 Share Posted March 4, 2008 I have had around 10 trucks (mainly 6.0's) that would not leak coolant until they sat overnight outside in the cold. Every single one had low coolant, sat in the warm shop overnight lost maybe 1psi of pressure. Now put it outside in the cold, and it would lose all pressure overnight and have a puddle. Just a suggestion for ure truck. Good idea. I have been doing the same thing on 6.0ls. It is amazing how many more small coolant leaks I will find in the morning after the truck sits overnight. Quote Link to comment Share on other sites More sharing options...
Jim Warman Posted March 4, 2008 Share Posted March 4, 2008 What I've come across, so many times and with so many different systems, that there is a need to repeat our testing in "real world" situations.... Unfortunately, this has often had me working outside in -30 weather more times that I care to think about... Not to hijack the thread... The most memorable one was a 6.0 Excursion with an improperly wired PATS bypass for the remote start.... Left in the cold, it would somehow turn on the generator field circuit (about 4 or 5 amps) unbtil the regulator warmed up , and then shut down..... only to repeat once the regulator cooled down. Takes about 4 days to drain the batteries.... and it would never happen in the warmth of the shop. Quote Link to comment Share on other sites More sharing options...
Tony302600 Posted March 4, 2008 Share Posted March 4, 2008 Not to hijack the thread... Famous last word's before we start talking about "members" Quote Link to comment Share on other sites More sharing options...
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