Coolant add, thermostat, housing and rad hose swap - Ford Powerstroke Diesel Forum
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Old 08-09-2014, 12:30 PM
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Coolant add, thermostat, housing and rad hose swap

I need to replace mt thermostat housing, gasket and I might as well swap out my thermostat will I have it all out. Since I am going thru this can I just add coolant to the overflow tank or do I add it somewhere else? Also what coolant to add to 1995 7.3? Thanks
I ordered the Thermostat housing, thermostat, gasket / O-ring & new upper radiator hose from Napa and IO am lost on what type of coolant to buy to at a min top off coolant till I can afford to take it and get a flush, Jiffy-Lube wants $130 is this way too much?

Last edited by pk64f100; 08-09-2014 at 01:36 PM.
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Old 08-09-2014, 06:04 PM
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Yes, you just add coolant to the tank. I use Walmart brand green coolant (SuperTech? ...~$10 a bottle) and distilled water (50/50 mix).
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Old 08-09-2014, 09:14 PM
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I've been through this a few times with my 95 and just recently did it.

Buy DISTILLED water and whatever coolant.

When you remove the old pump clean the gasket area very well. Use a razor blade then some 120 grit sand paper and lightly remove whatevers left.

Apply small dots of rtv in the corners and every couple of inches to hold the gasket on the water pump.

Before installing water pump install the thermostat and housing tube. I always lightly sand the coolant tube and apply a small layer of rtv on the coolant tube where the gasket meets. I torqued to 12ft/lbs and bought stainless bolts to replace the stock ones.

When installing the water pump torque to 16-18 ft/lbs.

I never had leaks after my first replacement but went with a cheap pump which is why I recently replaced it with a life time Murray since the bearings went out on the old and started weeping out the hole.

Edit: install what coolant/water you can into the coolant housing tube then when it stops filling put the hose on and fill the rest in the reservoir. Run it up to temp and it will work the air out. After the next few runs check the level in the overflow to see how much it needs added.
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Old 08-10-2014, 04:12 AM
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Any additives needed to the green and distilled h2o?

Thanks, do I need to add any type of additives to the 50/40 mix? My son mentioned something about an additive? TY
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Old 08-10-2014, 06:04 AM
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If you use typical green antifreeze then yes you must add the sca additive such as Napa Kool or Penray 2000. I highly recommend going with 50/50 fleet charge from Napa. It is what I use plus I just changed over a fleet of school buses to it. It is a life time antifreeze, meaning that unless it gets contaminated it stays in the life of the engine plus it already has the sca (nitrate) additives to protect the engine.
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