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Running hot
Thread Starter
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Mountain Pass
Joined: Dec 2010
Posts: 217
Likes: 6
Running hot
2004 6.0 290K mileage
Truck Is running hot. Have recently replaced oil cooler and bulletproof egr for second time. Thermostat is removed. She runs around 216 ECT but have seen her jump to 230 plus on a climb. Fan appears to function although the fan speed seems to have little rhyme or reason when monitored on scan gauge. Water pump changed maybe 150K ago with fan clutch
I know that I have a leaking Y pipe and wondering whether this could be causing it
Any ideas.
Mark
Truck Is running hot. Have recently replaced oil cooler and bulletproof egr for second time. Thermostat is removed. She runs around 216 ECT but have seen her jump to 230 plus on a climb. Fan appears to function although the fan speed seems to have little rhyme or reason when monitored on scan gauge. Water pump changed maybe 150K ago with fan clutch
I know that I have a leaking Y pipe and wondering whether this could be causing it
Any ideas.
Mark
Laughing Gas
Joined: Dec 2005
Posts: 972
Likes: 224
From: Linden, Ca.
No thermostat is prolly your problem. Thermostats serve to get the engine up to temp quickly AND to restrict/regulate flow through the radiator. If you don't have a thermostat the coolant is circulating to fast and not spending enough time in the radiator to be cooled back down again.
Put in a new thermostat and monitor temps from there. ALSO, blowout the radiator core with compressed air to get the years bug and dirty build up out of it. B.
Put in a new thermostat and monitor temps from there. ALSO, blowout the radiator core with compressed air to get the years bug and dirty build up out of it. B.
Hotshot
Joined: Jul 2005
Posts: 13,834
Likes: 26
From: Middle Tn.
No thermostat is prolly your problem. Thermostats serve to get the engine up to temp quickly AND to restrict/regulate flow through the radiator. If you don't have a thermostat the coolant is circulating to fast and not spending enough time in the radiator to be cooled back down again.
Put in a new thermostat and monitor temps from there. ALSO, blowout the radiator core with compressed air to get the years bug and dirty build up out of it. B.
Put in a new thermostat and monitor temps from there. ALSO, blowout the radiator core with compressed air to get the years bug and dirty build up out of it. B.
Fleet Mechanic
Joined: May 2010
Posts: 1,480
Likes: 161
From: West by God Virginyuh
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Mountain Pass
Joined: May 2007
Posts: 153
Likes: 2
From: Pheasant Hill, CA
my vote is for plugged Radiator. I have never bought thing from them , just a thought. https://shop.performanceradiator.com...roduct_id=5515
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Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
What are temps after sitting all night, oil and water? First step to see if sensors are good, they are the same part and can be swapped.
Then check circulation and pressure. Get up to temp, slowly relieve degas pressure. Drive some more, see if presume returns if not, it's a circulation issue or plugged radiator. If heavy pressure returns, possibly head gaskets.
Any degas tank puking? What's the level in the tank, just under min mark?
Then check circulation and pressure. Get up to temp, slowly relieve degas pressure. Drive some more, see if presume returns if not, it's a circulation issue or plugged radiator. If heavy pressure returns, possibly head gaskets.
Any degas tank puking? What's the level in the tank, just under min mark?
Fleet Mechanic
Joined: Jan 2012
Posts: 1,668
Likes: 13
From: Saskatchewan
I'm going to throw my $.02 in here. Although I've rairly seen removing a thermostat help with overheating I've also never seen it hurt either. Also blowing out the rad with compressed air could help, I would remove it and wash it out with soap and pressure washer. You would be amazed at how much crap will come out of it. Good luck with your problem.
Thread Starter
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Mountain Pass
Joined: Dec 2010
Posts: 217
Likes: 6
Overnight temps are within a couple of degrees of each other. Don't believe it's head gaskets as I checked before replacing the EGR with the chemical test to see if there was carbon dioxide in coolant and negative.
Was wondering if y pipe leak was causing engine to run hot if turbo not functioning properly because of it
Thanks for all the suggestions
Mark
Was wondering if y pipe leak was causing engine to run hot if turbo not functioning properly because of it
Thanks for all the suggestions
Mark
Laughing Gas
Joined: Dec 2005
Posts: 972
Likes: 224
From: Linden, Ca.
Well, an exhaust leak can add to additional engine compartment heating sure. And that MAY be adding to your issue.
BUT, if your radiator is original and has never been blown out you have a lot of junk plugging up the exterior of the core. It's 12 years old with nearly 300K miles on it. Plus you have the inter-cooler in front of that that is surely also full of bugs and dirt. Plus, you have A/C condenser and oil coolers in front of that that are full of bugs and dirt. Add it all up and you have a potentially substantial decrease in air flow through your cores. B.
BUT, if your radiator is original and has never been blown out you have a lot of junk plugging up the exterior of the core. It's 12 years old with nearly 300K miles on it. Plus you have the inter-cooler in front of that that is surely also full of bugs and dirt. Plus, you have A/C condenser and oil coolers in front of that that are full of bugs and dirt. Add it all up and you have a potentially substantial decrease in air flow through your cores. B.
Thread Starter
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Mountain Pass
Joined: Dec 2010
Posts: 217
Likes: 6
Got home and have had truck worked on. Replaced theYpipe, replaced thewTer pump (which looked in decent shape, no impellers broken no apparent slippage),and removed and cleaned the radiator ( which wasn't particularly dirty). Fan clutch. Inspected the fan clutch which appears to bein good condition and working properly.
Truck still appears to be running hot 212 to 216 under normal conditions rapidly rising to 220 to 226 on any minor hills. Haven't done a steep climb since working on it but on my recent trip temps would rise int the 230's and at one point touched 240. Not much change in what I was seeng before the work.
Outside temps mid 70's to mid 90's. I do have a light tune on the truck by Power Hungry Performance if this makes a difference.
Perhaps I am being neurotic and these aren't that bad. What are others seeing temp wise and do any of you guys have any further ideas or suggestions
Thanks in advance. Mark
Truck still appears to be running hot 212 to 216 under normal conditions rapidly rising to 220 to 226 on any minor hills. Haven't done a steep climb since working on it but on my recent trip temps would rise int the 230's and at one point touched 240. Not much change in what I was seeng before the work.
Outside temps mid 70's to mid 90's. I do have a light tune on the truck by Power Hungry Performance if this makes a difference.
Perhaps I am being neurotic and these aren't that bad. What are others seeing temp wise and do any of you guys have any further ideas or suggestions
Thanks in advance. Mark