Coolant flush
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Tuned
Joined: Jan 2022
Posts: 274
Likes: 12
Coolant flush
Hello all I have a 94 f150 5.0 I need to replace water pump and wanted to do coolant flush, question is which better flush before pump change or after pump change. What is best and safest coolant flush that y'all know of. Also coolant is circulating in radiator water pump just started leaking from hole on top. And help greatly appreciated.
Cross-Country
Joined: Aug 2011
Posts: 85
Likes: 19
From: South Puget Sound
I did this in 2016 on my 1994 F150 5.0:
Flushed with two bottles of Prestone AS-105Y; then flushed with distilled water.
R&R a bunch of coolant system parts:
-water pump Duralast CWP-657 lifetime warranty
-thermostat - Duralast 15359
-heater hoses - ⅝ inch
-bypass hose
-upper radiator hose
-lower radiator hose
-all miscellaneous coolant rubber hoses
-Stant 10329 13lb levered radiator cap
-Prestone ethylene glycol AF2000 - 2 gallons - topped off with distilled water
No overheating before or after this maintenance.
Flushed with two bottles of Prestone AS-105Y; then flushed with distilled water.
R&R a bunch of coolant system parts:
-water pump Duralast CWP-657 lifetime warranty
-thermostat - Duralast 15359
-heater hoses - ⅝ inch
-bypass hose
-upper radiator hose
-lower radiator hose
-all miscellaneous coolant rubber hoses
-Stant 10329 13lb levered radiator cap
-Prestone ethylene glycol AF2000 - 2 gallons - topped off with distilled water
No overheating before or after this maintenance.
More Turbo
Joined: Sep 2012
Posts: 739
Likes: 256
From: Zimmerman, MN
Personally I would flush before the pump changeout, as who knows what that old crud can (will?) do to the impeller and seals.
If it helps, I'll be installing a new radiator in my '67 F250 when it arrives, and same thing- flush before the install. Give it a clean start!
If it helps, I'll be installing a new radiator in my '67 F250 when it arrives, and same thing- flush before the install. Give it a clean start!
Cargo Master
Joined: Mar 2007
Posts: 2,848
Likes: 1,034
Never buy a lifetime part from those box stores. Unless you like replacing them regularly. Lifetime means little if you have to do them every 6 months. Good OEM that will last years is better than a lifetime warranty part that might last months.
Beware that the mounting bolts may be seized and break. Have a plan B to replace the entire front cover, thermostat housing, and seized bolts.
Beware that the mounting bolts may be seized and break. Have a plan B to replace the entire front cover, thermostat housing, and seized bolts.
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Frozen_Joker
1987 - 1996 F150 & Larger F-Series Trucks
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Nov 19, 2013 06:27 PM
