Advice on super flushing the coolant system

[M91]

I have the coolant system so rusted out and i replaced the the water tank and did two flushes with those coolant flush machines and no luck so far, the rust keep on coming back and i removed the cot and inside of the head is filled with rust :(
I used liqui moly radiator cleaner and not the expexted results and of course all my flushes was without the thermostat, also i did maybe 5 flushes using distilled water, fill, drive around for a day or two until i see the rust in the water tank and flush, any ideas? I want that rust completely out of the coolant system :(

Note:
The heater lines plus the pcv lines are disconnected.
I got the on3 performance cot delete kit plus the rear head fittings but i didn't installed it yet until i find a solution to the rust.
Plus a new custom 4 row aluminim radiator also didn't installed it yet. I dnt think its a good idea to install these parts on a rusted system.

[Turbov6Bryan]

can you remove the thermostat, take a garden hose and fashion it in between the 2 hoses that would bypass the heater core. Then open the drain in the radiator.

Turn on the garden hose and start the car and let the water flow.

Ad super flush radiator and block cleaner if you wish, maybe ad water pump lube when its all said and done.

Ive ran RMI and that is basically a water wetter, but cleans the system and deposits all the crap into the over flow jug. Causing it to float.

The flush kit is avail at most parts stores, its a T with a garden hose attachment.

[justbob]

Remove block drains and rake the rust out with a pick until clear water flows.


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[BAD MERC]

Curious how rust accumulated in an aluminum engine. I'd try pure vinegar and clean water. Bring to operating temperature, drain, refill, repeat as necessary. Change the thermostat and possibly the radiator if the rust has debris in it.

[M91]

can you remove the thermostat, take a garden hose and fashion it in between the 2 hoses that would bypass the heater core. Then open the drain in the radiator.

Turn on the garden hose and start the car and let the water flow.

Ad super flush radiator and block cleaner if you wish, maybe ad water pump lube when its all said and done.

Ive ran RMI and that is basically a water wetter, but cleans the system and deposits all the crap into the over flow jug. Causing it to float.

The flush kit is avail at most parts stores, its a T with a garden hose attachment.

The heater core lines are disconnected and plugged off

[M91]

Remove block drains and rake the rust out with a pick until clear water flows.


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Sorry i couldn't understand, can you please explain more?

[M91]

Curious how rust accumulated in an aluminum engine. I'd try pure vinegar and clean water. Bring to operating temperature, drain, refill, repeat as necessary. Change the thermostat and possibly the radiator if the rust has debris in it.

If it worked tell us

[justbob]

Sorry i couldn't understand, can you please explain more?



There is normally one engine block drain on each side of most engines accessing the coolant passages. Remove the plug and hopefully coolant will flow out, but if it’s as bad as you say it might just be rusty sludge needing to be removed with a pick until it flows. Assuming 4.6’s have drains? Don’t know, never needed to look..

I can’t explain it anymore than that. Go watch a video like everyone else nowadays if need be?


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[M91]

There is normally one engine block drain on each side of most engines accessing the coolant passages. Remove the plug and hopefully coolant will flow out, but if it’s as bad as you say it might just be rusty sludge needing to be removed with a pick until it flows. Assuming 4.6’s have drains? Don’t know, never needed to look..

I can’t explain it anymore than that. Go watch a video like everyone else nowadays if need be?


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I don't know about the block drain first time i hear about it, i tried to look for videos and only found looks like a drain plug l'll look into the MM block n get back to you.

[M91]

Any advice on a good coolant flushes?? Since i have a lot of rust i believe it will take several flushes to remove it all

[Turbov6Bryan]

Any advice on a good coolant flushes?? Since i have a lot of rust i believe it will take several flushes to remove it all

Read post #2

[Zack]

There is only one block drain, and its on the drivers side near the transmission. 3/4" socket needed

[Granddaddy Marq]

We had the same problem on my son's old wrecker. We removed the thermostat and rigged up some pipes and fittings then ran the garden hose through it while it was running. It flushed everything out. Looked good for about a week or 2 and then back to rusty mess. We then tried a trick my daddy did on a 62 Chevy truck. Get a fuel filter assembly off a big truck and plumb it into the heater hose. Instead a new filter and run it. In 2 weeks it cleaned the coolant up. Just replace the filter when the heat quits working.

[Granddaddy Marq]

Oh yeah that 62 Chevy truck is still running.

[M91]

Read post #2

I already had a super flushes only couple of days and the rust comes back but about the water wetter we don't have it in saudi Arabia neither the flush kit i gave it a thought but its a long shot to order from ebay and ship it to saudi Arabia but if is there no other way i'll order it :(

[M91]

There is only one block drain, and its on the drivers side near the transmission. 3/4" socket needed

Thanks for the help i appreciate it man👍👍

[M91]

We had the same problem on my son's old wrecker. We removed the thermostat and rigged up some pipes and fittings then ran the garden hose through it while it was running. It flushed everything out. Looked good for about a week or 2 and then back to rusty mess. We then tried a trick my daddy did on a 62 Chevy truck. Get a fuel filter assembly off a big truck and plumb it into the heater hose. Instead a new filter and run it. In 2 weeks it cleaned the coolant up. Just replace the filter when the heat quits working.

Sounds like the smartest idea i've ever heard of lol, definitely will try it but as for the fuel filter maybe i'll use the biggest one i can get my hands on, thanks for the help i appreciate it.
I'll be back with feedback when am done with it :)

Thank you everyone for your help i really appreciate it 👍