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Old 07-22-2016, 10:59 PM
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flushing motor before radiator install

Is there a proper way to flush the engine before installing a new radiator? I'm on a budget currently and will do what I can with a hose!? should I go from both directions or thru the upper hose? I'm assuming the thermostat will be closed if its cold so how would that work? I'm not replacing the thermostat yet. Any suggestions or is this not very effective? Never done this so be easy on me.

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Old 07-23-2016, 12:14 AM   #2
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With my old rad still in place I bought several gallons (like 12 @ .60 ea) of distilled water, drained all antifreeze, filled it up with the water, ran engine to temp, drained, then ran with heater on to flush the core, and repeated each step till it came out clean

Then installed new rad, hoses, thermostat, etc.

Some people use a hose to flush on low pressure and just use the distilled water during the antifreeze fill, but the water is so cheap I figure why introduce any contaminants to the system.

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Old 07-23-2016, 12:17 AM   #3
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I'm assuming the thermostat will be closed if its cold so how would that work?
Use the heater hose nipple at the thermostat housing. That will bypass the closed thermostat.
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Old 07-23-2016, 12:28 AM
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Thanks...I've watched a few vids on YouTube. Always forget about that, haha. Yeah for the cost of water I agree, I'll use all distilled.

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Old 07-23-2016, 04:13 PM   #5
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I had the thermostat, water pump, and radiator out. I sprayed the heck out of the block with a hose, through both the water pump and the thermostat. Once it ran clear, I kept spraying it and sprayed compressed air in there. More crud came out.

I did the same with the radiator and heater core. Remove the heater hoses from the water pump and thermostat and spray through where the hoses went. And spray both ends of the heater core to flush it.
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Old 07-24-2016, 12:03 AM   #6
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I take it that no one uses a good name brand Cooling system cleaner, then flush well and install new Rad..
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Old 07-24-2016, 09:16 AM   #7
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I take it that no one uses a good name brand Cooling system cleaner, then flush well and install new Rad..
Those things are just white vinegar with additives. I put a quart of vinegar in there to flush it before, but once you have the whole system apart it's easy to see how much a flush DOESN'T get out. Spraying it with the hose got so much out that I didn't think was even in there. It'll sit in the block where the water pump is.

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