Overheating in the Arctic - Defender Source
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  #1  
Old February 14th, 2010, 03:19 PM
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John Crouse
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Overheating in the Arctic

Went skiing yesterday and truck sat in the parking lot all day. It was very cold (15-20 degrees). At the end of the day, I headed up Berthoud Pass, and the truck began to overheat. Once committed, I couldn't turn around (a horrific accident closed the road behind me). I stopped at the top of the pass and let it cool for a bit. Headed down the other side, still hot. Got to a gas station and popped the hood. Coolent was a little low, but not much. I added a bit and started up. Temperature went right to 180. No more problems.

Trying to understand what happened. It doesn't make sense to me. Any thoughts?
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  #2  
Old February 14th, 2010, 03:38 PM
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Kevin Buckley
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How old, what mix is your anti-freeze? Unlikely, but a partial freeze of your radiator could have partially blocked the flow?
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Old February 14th, 2010, 04:27 PM
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Air lock in the inlet manifold? is there a little pipe running from the inlet manifold to the radiator? If that blocks it can lead to air gathering up there which then leads to overheating.
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Old February 14th, 2010, 08:10 PM
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John Crouse
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There was clearly some sort of obstruction. I just don't know if it was air, ice, or something else.

I think it was the act of depressurizing that solved the problem. It was like a switch. It immediatley went to normal.
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Old February 14th, 2010, 11:44 PM
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John Crouse
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Did it again tonight as we were leaving dinner. Ran all day with no problems. I need to figure this out.
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  #6  
Old February 15th, 2010, 12:30 AM
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Check your coolant to see what temp it can go down to.

I would also check that your thermostat is working properly.
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Old February 15th, 2010, 04:39 AM
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Sounds more like a sticking thermostat. I'd change out the Thermostat and put in fresh, known concentration coolant while I was at it
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Old February 15th, 2010, 09:22 AM
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Kevin Buckley
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Stop driving it, these are the last motor you want to overheat a few times.
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  #9  
Old February 16th, 2010, 12:00 AM
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John Crouse
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Replaced thermostat and filled it up. Coolant blew out the intake manifold gasket. Looks like that's the culprit.
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  #10  
Old April 27th, 2010, 02:42 PM
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John Crouse
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Ok, it looks like my cooling problems are finally solved. Intake manifold gasket and then an upper radiator hose seem to have done the trick. Hose had a leak on the underside that I could not see until it completely failed. Truck has been right at 180 degrees since I installed the replacement.
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  #11  
Old April 27th, 2010, 05:22 PM
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Glad to hear it's sorted.
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  #12  
Old April 28th, 2010, 05:47 PM
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If I were you, I would go to NAPA and get a block tester (about $50) that will test your coolant for exhaust gases. This will tell you if you have a porous block or a slipped cylinder---if you do, then your fixes will work in the short run but it may re-pressurize over time depending on how bad the leak. It is a simple test but one that I personally would find valuable since you don't want to be stuck in the middle of nowhere.

I personally had this problem and used a block sealant to solve it for years and years--although it reappeared recently and I rebuilt the engine from a new block.

Not saying that this is your problem, but you certainly had the symptoms and I would rule it out once and for all.

My 2cents.
Chris
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