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Old 12-08-2011, 03:55 AM
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Thermostats Replacement

Well after about two months of having faulty thermostats I took the plunged last night and replaced the t-stats. I really wish I would have done it sooner. I know it was probably so bad for my engine and honestly it wasn't hard at all. It took about 2 1/2 hours and now it's so nice to have heat!!!


Anyways, this whole time I am positive the high temp t-stat is stuck open. Well I was wrong. The base of BOTH t-stats are suppose to be covered with rubber and the ones I removed did not. It had deteriorated and left a bunch of tiny holes for coolant to flow through. I'll post pics later.
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Old 12-09-2011, 09:31 PM
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What were your symptoms? Just no heat, or were your temps way off? I just want to know what to look out for on mine. Still running original T stats.
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Old 12-09-2011, 09:48 PM
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Well I could drive for two hours and the coolant and oil temps wouldn't reach 120* F. And yes that means no heat. If I turned the heat on it would start dropping the temps down. Basically it acted just like an over extended t-stat. My truck has 133k on it.
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Old 12-11-2011, 06:50 AM
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Mine did the same thing. Couldn't get temperature over 150. All of the rubber gaskets on both thermostats was missing. Wonder where that ended up?
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Old 12-11-2011, 06:53 AM
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Just a quick de-rail: why 2 thermos on a 6.4?
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Old 12-11-2011, 02:02 PM
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Just did my thermostats when doing my egr delete. For some reason my truck would get to about 160 degrees and that was it. Thought i had a stuck thermo. Turns out they werent stuck at all. Rubber was also still intact. Put the new ones in along with the updated upper rad hose. Now it gets up to about 188-192 driving. They must have been opening early. Still only about 170-180 degrees on high idle though. Anyone elses truck not get up to temp just idling? Maybe i need to get a winter front.

Also i couldnt imagine trying to change those thermostats with the egr coolers still in the truck. What a pain in the a$$ that must be. Having to remove all that junk just to get to the housing.
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Old 12-11-2011, 05:05 PM
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Does anyone have a "How To" list to change the thermostats? I would like to do mine, thanks
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Old 12-11-2011, 05:47 PM
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This shows how to change them without removing the egr coolers. Let me know if you have questions being that I just did them under 3 hours taking my time.
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Old 12-11-2011, 05:51 PM
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Oh fyi you don't have to remove all the parts in that video. Just the battery, degas tank, upper radiator hose, and loosen hot side charge pipe. Very simple.
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