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post #1 of 6 Old 11-20-2013, 03:12 AM Thread Starter
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Water pump replacement ?

Hey folks

During the summer I had a coolant leak at the thermostat housing. I had the two thermostats changed along with the gasket. I also changed upper and lower hoses with the new two ring style. Flushed and refilled with rotella ELC coolant / distilled water. All is good with no leaks however using heat more now and finding that heater output is better when not at idle. I have no overheating issues no loss of coolant (I check level everyday since). And no issues with lack of power (at least as far as I can tell). My truck has the supplemental electric heater and I have not seen any evidence that it is working as in the morning I'd expect at least a little bit of heat until coolant gets warm. Are these two issues related ? Might I have a water pump issues with respect to seeing more heater output at higher RPMs ? How hard is it to do the water pump myself ? Did some searches prior to asking however did not find anything specific to my situation
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post #2 of 6 Old 11-20-2013, 05:25 PM
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Make sure the cap is good, first.

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post #3 of 6 Old 11-21-2013, 03:01 AM Thread Starter
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I replaced the cap as part of the thermostat / hose work.
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post #4 of 6 Old 11-21-2013, 07:33 PM
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Heater core restriction possibly. Try flushing just the heater core.

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2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
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post #5 of 6 Old 11-22-2013, 06:28 AM Thread Starter
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Is the process for flushing just the heater core different from that of flushing the whole system ?
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post #6 of 6 Old 11-23-2013, 08:17 AM
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To be honest, I'm not certain there's a procedure for flushing just the core.

I kind of devised my own system/procedure for doing it.

I use an intercooler pump from a SVT mustang, disconnect both heater hoses and install the pump in line. I use a small degas bottle (SVT mustang also) add flushing solvent and some water and supply the pump power. Once it starts flowing, add fluid until it's closer to the full line in the degas. Let that run for awhile.

Then remove this cobbled together system, and hook a garden hose to one of the hoses. Turn it on, let it run.

Switch the garden hose to the other heater hose, let it run.

Hook up system, fill and bleed, hope for the best.

Always obey all environmental and disposal laws.

Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.
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