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post #1 of 13 Old 08-09-2013, 01:57 PM Thread Starter
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6 liter getting hot

Lately my 6 liter has been getting hot under no real load to speak of. Has been doing this for like 3 weeks. Oil and coolant levels are fine. It never seems to boil over, just get hot and then cool back down while driving. The problem seems to get worse at cruising speeds like 1750 rpm to 2000. Sometimes if I speed up and get more RPM's the thing cools down, sometimes it gets hotter.

I took it to a local mechanic and he seemed to not be very good at diagnosing the problem. He told me the fan motor was out and fixed that for a chunk of change and that did nothing. He then changed the thermostat and that seemed to do a little bit to help but now it's back to heating up like it was again. He also put some sort of fluid in a container over the inlet for the coolant and said if there were exhaust gasses in the coolant it would tell him and there were none present according to him (fluid never changed color).

Any ideas?
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post #2 of 13 Old 08-09-2013, 02:09 PM
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My guess would be water pump... The impeller is made of plastic and can crack and cause poor coolant flow.

The symptom typically is: "The truck could sit and idle all day long and not overheat, but as soon as you start driving or put RPM in it the truck will run hot and overheat."

Pull the small coolant hose from the intake to the degas bottle, let the truck idle and see if you get a steady stream of coolant. If not then you most likely have a bad water pump impeller.

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Last edited by a2elvis; 08-09-2013 at 02:10 PM. Reason: Welcome
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post #3 of 13 Old 08-09-2013, 02:09 PM
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First off welcome to the site. Are you getting you temps from the guages in the dash or are do you have some sortof after market monitor. The reason I ask is by the time the dash guages are reading that you have a issue, you have had a issue for alot longer. I was suprised recently while pulling some mountain pass's how slow to react the factory dummy guages were. And also the truck has no way (with the factory set up) of telling you if your oil cooler is clogged up and the oil is getting hot.
But one of the issues that the 6.0 has is the water pumps are just pressed on plastic impellers that start slipping over time. I wonder if this might be something that your dealing with.

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post #4 of 13 Old 08-09-2013, 02:10 PM
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Elvis beat me to it!

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post #5 of 13 Old 08-09-2013, 02:12 PM
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Originally Posted by kinnisoj View Post
Elvis beat me to it!
No worries brotha!!

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post #6 of 13 Old 08-09-2013, 02:19 PM Thread Starter
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Quote:
Originally Posted by a2elvis View Post
My guess would be water pump... The impeller is made of plastic and can crack and cause poor coolant flow.

The symptom typically is: "The truck could sit and idle all day long and not overheat, but as soon as you start driving or put RPM in it the truck will run hot and overheat."

Pull the small coolant hose from the intake to the degas bottle, let the truck idle and see if you get a steady stream of coolant. If not then you most likely have a bad water pump impeller.

BTW Welcome to the Org!

Thanks for the advice. I'll be checking that out asap.
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post #7 of 13 Old 08-09-2013, 02:21 PM
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If you do end up changing it check out the Bullet Proof Diesel water pump. Your truck will fall to peices before you'll be messing with the water pump again! Its a dang cryin shame to cover it up.....

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post #8 of 13 Old 08-09-2013, 02:22 PM Thread Starter
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Quote:
Originally Posted by a2elvis View Post
My guess would be water pump... The impeller is made of plastic and can crack and cause poor coolant flow.

The symptom typically is: "The truck could sit and idle all day long and not overheat, but as soon as you start driving or put RPM in it the truck will run hot and overheat."

Pull the small coolant hose from the intake to the degas bottle, let the truck idle and see if you get a steady stream of coolant. If not then you most likely have a bad water pump impeller.

BTW Welcome to the Org!

I'll be trying this test later today!! Thanks again.
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post #9 of 13 Old 08-09-2013, 02:23 PM Thread Starter
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Originally Posted by kinnisoj View Post
If you do end up changing it check out the Bullet Proof Diesel water pump. Your truck will fall to peices before you'll be messing with the water pump again! Its a dang cryin shame to cover it up.....
Great info, thanks. I might just change the pump as this one has about 100k on it.
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post #10 of 13 Old 08-09-2013, 02:26 PM
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Its actully pretty easy to do and while your in there you can do some preventive maintenance like the serp belt and radiator hoses.

BPD OIL COOLER W/COLD WEATHER PACK & BPD oil bypass amsiol filter
BPD WATER PUMP, RADIATOR+ EGR.ARP STUDS
,edge turbo timer
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ATLAS 40
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