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

 

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.

 

Agree 100%. The engine needs a T-stat.

 

Removing the thermostat was the first response to the problem rightly or Wrongly. The problem
Existed to the same degree with the thermostat in

Mark

 

Could be that the thermostat was stuck open and that started the problem.

 

that's what I thought you would say about tstat LOL
were said sensor tested for consistency

 

Sensor good? Radiator blocked? Coolant leak? Head gaskets?

 

my vote is for plugged Radiator. I have never bought thing from them , just a thought. https://shop.performanceradiator.com...roduct_id=5515

 

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?

 

Pull the radiator and intercooler and wash out the air side. I have seen a couple trucks plugged up pretty bad.

 

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.

 

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

 

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.

 

well do they rise consistent ect eot not jumping around


Impellar can also slip on water pump in addition to needing cleaning radiator

 

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