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Old 05-31-2005, 02:46 PM   #1
SATURNER
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Default Radiator Flush

I wish to flush the radiator im my '94 SC2. I "know how" but I have not been able to open the drain valve. When I turn it 90 degrees, no flow. It will not turn further for me. The draincock has a small plastic pin on it which rides in a slot. I can turn it until the slot changes direction. At this point there seems to be a barb in the slot. What is the trick to getting past this? Do I compress the barb, cut it off, do something else?

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Old 05-31-2005, 11:50 PM   #2
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1995 SC2
Default Re: Radiator Flush

I believe I remember a long time ago Wolfman saying the plastic petcock (drain plug) is removable. Maybe you can try turning it and wiggling it out? Of course be careful not to break it, it is plastic after all!

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Old 05-31-2005, 11:59 PM   #3
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Default Re: Radiator Flush

The drain tap varied over the years. Turn it COUNTER CLOCKWISE while wiggle/pulling OUT. When it drains it will DRAIN! be prepared.

NOTE: The plug does not actually come "out" of the radiator. It will pull out enough to allow the coolant to flow past it or out the drain nipple below it.

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Old 06-01-2005, 01:24 AM   #4
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Default Re: Radiator Flush

Wolfman, tell that to my drain plug. LOL. The first time I drained the coolant, I turned and turned that thing, and nothing was happening. Eventually it popped completely out of the radiator and coolant, of course, shot back towards the engine instead of straight down in to the drain pan.

It turns out that the drain hole was plugged with dirt that I didn't see. As for why the plug came completely out, I don't know. It never occured to me that it was unusual for that to happen. Either way, it screwed back in. Maybe it's slightly broken. I guess I'll have to look at it the next time I service the cooling system.

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Old 06-01-2005, 10:58 AM   #5
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Default Re: Radiator Flush

Thanks all! especially wolfman!
I was just being somewhat timid with the drain for fear of breaking it. Flush is underway.

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Old 06-01-2005, 11:04 AM   #6
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Default Re: Radiator Flush

Please continue to keep us informed.

As a side note, when I last changed my fluid, after turning the knob 90 degrees, allowing the fluid to fully drain, I was able to remove the knob, to check the rubber washer (O-ring) used to seal the knob.

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Old 06-03-2005, 02:48 PM   #7
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Default Re: Radiator Flush

Task complete.

The radiator drain was so difficult to open because it was sticking. I pulled the drain off, per Luke's suggestion , and found it to be in good condition.
Before reinstillasion, I put a small amount of petroleum jelly, per RAZORBAK, Tiger. WOW what a difference!! Turning force was reduced by a factor of about TEN!! Just wish I had done that after the first draining instead of the ,(well you do not want to know how many)th drain. Drained and filled many times as I was not using the block drain.

Part of my origonal concern was that I had never used a drain of this type before and was expecting it to open at 90 degrees of turn. Thinking that the drain was plugged, I probed with a small screwdriver and saw the slot That led me to post my question.

All in all, it went well, and my engine is now clean, with one gallon of new, proper coolant and distilled water.(Last two rinse cycles were done with distilled water)

My suggestions to people wanting to do this:
Get some ramps as it is somewhat cramped under the car.
Pull the drain out as soon as possible, and check, lubricate the o ring.

Thank you RalliArt16, wolfman, ArghIGiveUp, Luke, RAZORBAK, Tiger and everyone else who posted on the topic of radiator flushing.You helped me do it myself and save some money.

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