Ford Truck Enthusiasts Forums - How to backflush the heater core?????

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How to backflush the heater core?????

Title says it all. Just got finished watching a coolant flush video where he states to backflush the heater core after doing the vc9, but dosent say how to do such. Can somebody link me or explain it. Thanks

One other thing i forgot. Is it necessary to remove the thermostat while doing the coolant flush if i run the truck with the heat all the way on? By running the truck with the heat on, does that automatically flush the heater core?

I keep reading and reading on the coolant flush and people keep mentioning it, but nobody says how lol.

Quote:

Originally Posted by Bruin008 (Post 12715983)

I keep reading and reading on the coolant flush and people keep mentioning it, but nobody says how lol.

1. Drain coolant
2. Add 2 cans of VC-9 and top off with distilled water.
3. Drive 20 to 30 miles, preferably at highway speeds.
4. Drain radiator at petcock first, then pull lower hose. Then remove block plug on driver side. Not necesary to do passenger side.
5. Remove t-stat. To do this, remove air cleaner. Then 2 nuts on t-stat housing. Pry press. sensor bracket off of studs. Tight fit but it will move. Remove 2 more nuts and pull t-stat and housing from studs.
6. Remove t-stat and put housing back on. Re-assemble everything and fill with distilled water.
7. Run at 1200 rpm's for 3 to 5 minutes and drain as described in step 4.
8. Repeat 4 to 5 times or until water coming at is as clear as water going in.
9. Install t-stat using new O ring. I used vaseline to hold the O ring in place.
10. After everything is re-assembled fill with a 50/50 mix of Ford premium gold or Zerex GO-5.
11. Start engine and check for leaks. This is a lot easier and quicker than it sounds. If you don't remove t-stat then you have to run truck between each flush till t-stat fully opens and then let cool down to work on it.

Highly recommend installing coolant filter kit while cooling system is empty.

ok, I have all that. What about back flushing the heater core? Or does it do it on its own. If that's the case, I',m good to go.

Try this, page 18 or so. This is a good over all read, so, I might suggest having a cup of something and sit back and enjoy the read.

http://home.comcast.net/~lyon.family...ush%20v1-0.pdf

I've been thinking about how to flush the heater core(s) separately.
with the Excursion there is a long coolant flow all the way to the
rear heat unit.. and I think it makes it more work...

Just thinking... about the next time I have to do this

Perhaps using a spare set of hoses, we could bypass the heater core(s)
while flushing the engine/radiator.

Then use the original hoses to flush the heater core(s) separately, in reverse
direction if you pushed water through the other way?

where can I get the valve that fits into the block to drain the water out of the block. I have to change that little EGR cooling hose this weekend and might as well flush the system. I do have the dreaded green stuff in it now.

Quote:

Originally Posted by CR3999 (Post 12718062)

are you talking about the blue or orange hose that connects from the egr cooler to the oil cooler? if so the stealership will have it. might have to check around with them since they proab wont all have it in stock.

Quote:

Originally Posted by amdriven2liv (Post 12716329)

Try this, page 18 or so. This is a good over all read, so, I might suggest having a cup of something and sit back and enjoy the read.

http://home.comcast.net/~lyon.family...ush%20v1-0.pdf

this is what I have been looking for. Sad part is I have it saved in my favs, but I have like 200 other links also so I didnt find it lol. Think its time to clean my favs out lol. Thanks

Quote:

Originally Posted by CR3999 (Post 12718062)

F108N is the valve number.

Here is where one person found them:

Fumoto Engine Oil Drain Valve F108N : 16mm-1.5 / www.OilDrainValve.net

And here:

Search results :: Qwik Valve

Take it apart at the Vac Valve and at the Degass Bottle and Stuff A Garden hose in the Coolant bottle side Turn on High water press let it flush

Hell Stuff the Garden Hose in Each Way in the heater Core Vac Valve too

Oh 1 Catch My Coolant filter Tyes Back into Heater Return that How I can Reverse Flush

Here is How My Coolant filter Ties in

I Stuff the Garden Hose Into these Spots during Flush Does Great Job of Flushing the Heater Core

https://www.ford-trucks.com/forums/p...ictureid=75600

https://www.ford-trucks.com/forums/p...ictureid=75598