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Old 02-17-2012, 09:49 AM
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Trucks over heating? Need advice

Ok today I noticed my truck making a loud blowing noise under the good and it got louder as I accelerated. Like a monster fan blowing. It quit for a bit then half way home it started back. Then 5 min from home my check gauges light came on and the temp gauge shot through the roof. It's appears to have coolant and haven't lost any. The coolant is really nasty and due a flush. My coolant gauge seemed to be running cool. 170 ish which is weird. Would think it would be hot. I was gonna change my thermostat thinking it was stuck open and now this happens. Any ideas?
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Old 02-17-2012, 09:51 AM
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Probably the thermostat...


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Old 02-17-2012, 01:40 PM
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First off I am a little confused, you say the temp went thru the roof but then its running at 170.

The problem is it can be a lot of things. Sticking thermostat; clutch fan malfunction; restriction of air thru the radiator; oil cooler restricted causeing a flash boil int the EGR cooler; blown heads or gaskets.

What is puzzleing is no loss of coolant. I have to wonder if what you heard was the clutch fan actually kicking in an out, they sometimes are real loud especially if they have a chipped or cracked blade.

But then we are back to the temp gauge going nuts.

You really need to have it scanned on live data with a good scanner that can log data while driveing.
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Old 02-18-2012, 02:50 PM
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Replaced te thermostat. Ran the motor. Temps are fine. I know for a fact the Motor isn't over heating but he gauge is through the roof and the check gauge light is also on with a check engine light. Scanned it and it threw a temp sensor code. My fuel pressure is also higher probably because the temp sensor is bad. Bought a new sensor and the threads are way bigger. Everyone has the same part but it's way bigger???? Guess I'll have to go to the dealer Monday.

Now to the noise. It's not anything kicking on and off it stuck on. You know how loud a semi is taking off from a dead stop?? Te loud blowing noise. That's what my truck sounds like. Now my truck is a 6 spd and the more you get in the kettle between shift the louder is gets. When you clutch it you can hear it winding down??? Hopefully if I can get the right sensor in it will fix the problem. A mechanic I talked to told me the motor is built to do that when it start to over heat(or think it is)
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Old 02-18-2012, 03:02 PM
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Can you watch EOT? Bet that's what made the fan kick on if the ECT was low enough.
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Old 02-18-2012, 06:29 PM
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My eot gauge is not hooked up. I think the truck thinks its over heating because the sensor went bad. I wish I knew my delta but the trucks not over heating. No loss of coolant, no coolant in oil or in intake manifold? As soon as you crank the truck it pegs the hot mark within 30 seconds. After I get the sensor in I'm gonna eventually buy a new oil Cooler an flush the crap out of it. Start fresh with my eot gauge hooked up
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Old 02-18-2012, 07:56 PM
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Oh if it pegs right away I'd do sensor first.
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Old 02-18-2012, 08:10 PM
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Is there white chalky staining around the coolant bottle, if so for what it is worth replace the cap but not to concern you contact me for recommendations if it turns out to be the EGR Cooler or worse head gasket. Pull the EGR valve and see if it dry baked soot or mushy black caramelized soot. If there is signs of coolant there you will be likely replacing the cooler or the recommended delete. I see a lot of Powerstroke EGR Failures scroll to the bottom.

Dave
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