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help flushing cooling system please

John T
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John T

John T

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I used a flushing kit.. you know the kind where you put the T-fitting in the heater hose and then connect a garden hose.After running a bottle of radiator cleaner for a day, I drained and flushed as directed with heater on high.My question is this: while flushing, does the water really cycle through the entire system? I ask because it never really gets hot , and I'm assuming the thermostat never opens.So I'm gonna run straight water for a day, then drain again (maybe do that twice over a couple days)then add my distilled water/antifreeze.Anybody see any problem with this?Thanks, John

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ISX

ISX

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The heater core is part of the engine circulating part. Water circulates through it whether or not the thermostat is open so this is a good way of flushing it. Trying to flush with say, the top radiator hose, would then face the thermostat problems.

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John T

John T

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Is the hose going right into the t-stat housing?t-stat housing is not quite as accessible on the 12v. Can't say for sure because I never opened it, but i think I have to remove alternator bracket, then it looks like the t-stat sits horizontal. (i think)As long as the T-fitting method works, I'll probably stick with that.I do have another question ... I think my valve cover gaskets are leaking....but that's for another post.

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Mopar1973Man

Mopar1973Man

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In that case just replace the housing cover without the t-stat to run your water through... Another way to do it is take the t-stat out, replace the housing and upper hose but leave it disconnected from the radiator. Leave the lower hose hooked up place your hose in the radiator filler hole and start and let run the water pump will draw the water through the system and back out the upper hose...

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Terry C

Terry C

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oh no there is no drain on the radiators ? you kidding me right :cry: I was gonna do that next weekend.

Yea there is. It is on the drivers side on the back of the radiator. It is only a small drain that uses 3/8" tubing. Maybe drain the antifreeze with the drain then pull the lower hose (at the radiator) if you want to flush the system.
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blk90s13

blk90s13

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Yea there is. It is on the drivers side on the back of the radiator. It is only a small drain that uses 3/8" tubing. Maybe drain the antifreeze with the drain then pull the lower hose (at the radiator) if you want to flush the system.

that sounds better now I can go buy come antifreeze for next weekend's project, this will be my first time changing antifreeze in a diesel which means long wait till coolant bubbles out etc. I use a easy fill funnel that just hooks to the radiator cap and you let the car run till antifreeze blows out all air while bubbling wonder how long I have to wait on the truck next weekend
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Terry C

Terry C

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wonder how long I have to wait on the truck next weekend

Shouldn't have to wait long. On the 12v there is a hose that bypasses the t'stat that works well for bleeding the block. Not sure on the 24 valve though. I seem to recall there is a pipe plug close to the front of the head that can be removed to bleed the air.
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John T

John T

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ok, flushing is done, and new antifreeze added, but I hear water flowing through my heater core.seems to go away after a few minutes driving but returns again after truck sits a while.I see ,from earlier posts, references to bleeding air off,..... what do I need to do for that?

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Terry C

Terry C

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John, that depends on how much driving you are doing. Have you gotten it warm enough to have the t'stat open a few times? That should be enough to get all the air out. If not look for a pipe plug that you can loosen right around the t'stat. I believe you can use a 3/8" ratchet to unscrew the plug.

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