elabay Posted April 5, 2015 Share Posted April 5, 2015 First post here. I've been reading for awhile soaking up information. Now I have a question. I drive a 2014 gu713 with a mp8 505. It started getting hot with any load behind it. Running empty it'll run 205 degrees give or take but put any load behind it and it'll get hot enough to shut down if I keep my foot in it. Its been in the shop since monday and they are at a loss. It runs great otherwise. Have you guys experienced this or have a place to start? Sent from my SAMSUNG-SGH-I547 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/39575-running-hot/ Share on other sites More sharing options...
mrsmackpaul Posted April 5, 2015 Share Posted April 5, 2015 if it had a few years on it I would say radiator sounds like its blocked in the tubes I'd pull the tanks off and rod the radiator core if it was mine is the fan clutch thingo working properly ??????????Paul Quote Link to comment https://www.bigmacktrucks.com/topic/39575-running-hot/#findComment-285430 Share on other sites More sharing options...
gearhead204 Posted April 5, 2015 Share Posted April 5, 2015 i would sugest they check water pump pressure, it sounds like a no flow issue the rest of the truck is too new for other cooling issues for the most part, 1 Quote Link to comment https://www.bigmacktrucks.com/topic/39575-running-hot/#findComment-285432 Share on other sites More sharing options...
turckster Posted April 5, 2015 Share Posted April 5, 2015 I would make sure there is good air flow through the radiator and the fan clutch is engaging. Most common fan clutch I see is the electronic viscous fan. There are two types of electronic fans: the Behr and Borg/Warner fan clutches. The Borg/Warner is the most common used in the past few years. To test the B/W fan simply unplug the fan wire harness connector, start the engine and within 30 seconds the fan should fully engage. If it doesn't then there is the problem. To test the Behr, diagnostic software is needed. To tell the difference between the two fans, the Behr is about 12" in diameter (give or take) while the B/W is about twice the diameter. Another possible reason is the thermostat hanging in the closed position, I've seen that a few times here and there. By what you describe, though, it sounds like a fan clutch issue. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/39575-running-hot/#findComment-285494 Share on other sites More sharing options...
mowerman Posted April 5, 2015 Share Posted April 5, 2015 isnt it still under warranty????bob Quote Link to comment https://www.bigmacktrucks.com/topic/39575-running-hot/#findComment-285496 Share on other sites More sharing options...
elabay Posted April 5, 2015 Author Share Posted April 5, 2015 It only has 40000 miles on it. That shouldn't be enough miles for any problems. I'm going to call again in the morning and make sure they have checked those things. After reading the water pumo pressure comment, I remember a few times under acceleration I would hear a squealing sound. Now I wonder if it has something to do with the water pump or fan maybe locking up. Thanks guys. I will post updates.Sent from my SAMSUNG-SGH-I547 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/39575-running-hot/#findComment-285511 Share on other sites More sharing options...
turckster Posted April 6, 2015 Share Posted April 6, 2015 It only has 40000 miles on it. That shouldn't be enough miles for any problems. I'm going to call again in the morning and make sure they have checked those things. After reading the water pumo pressure comment, I remember a few times under acceleration I would hear a squealing sound. Now I wonder if it has something to do with the water pump or fan maybe locking up. Thanks guys. I will post updates.Sent from my SAMSUNG-SGH-I547 using TapatalkAge has nothing to do with it nowadays. There is a lot of technology in these trucks, sometimes I think a little too much. I think the manufacturers push the technology out too soon without proper real world R&D. For example, I've seen bunches of these fan clutches fail on fairly new chassis, Volvo and Mack. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/39575-running-hot/#findComment-285621 Share on other sites More sharing options...
elabay Posted April 7, 2015 Author Share Posted April 7, 2015 Well you guys that said fan clutch are right. Its been over a week but hopefully I will get it tomorrow morning. Sent from my SAMSUNG-SGH-I547 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/39575-running-hot/#findComment-285810 Share on other sites More sharing options...
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