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Old 09-22-2017, 03:26 PM   #1
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2003 26' Land Yacht 26
Portland , Oregon
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Radiator flushing

I am a total newbie to the RV world. Just bought a 2003 Land Yacht, 26' with a Vortec 8.1L V8 and I want to flush and replace the coolant. So I crawled under the bus but could not find any petcock. (It's been a long time since I did something like this and maybe things have changed.)
I read on another forum that I may have to disconnect the lower radiator hose and then remove the drain plug on the engine block. I could do this if I knew where to look. It's really busy down there.
Anybody have pictures, a link to a video, or general instructions that would direct me to the right places? If so, I will be forever in your debt.
Thank you very much. Really.
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Old 09-22-2017, 03:31 PM   #2
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Oswego , Illinois
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Going from ancient memory here. Pull the lower hose. IIRC, you'll find the block plug on driver side about centered in the block and about half way from the head gasket and oil pan mounting flange.
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Old 09-22-2017, 06:02 PM   #3
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1981 31' Excella II
New Market , Alabama
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Most radiators have a petcock on the lower tank. Pulling the bottom hose is good as well. I just did this on my Excursion. I pulled the thermostat and flushed with tap water while the engine is running. I put it back together without the thermostat and let the tap water flush all the junk out. Then I drain and fill with distilled water to get all the tap water out. Drain then fill with 50/50 antifreeze distilled water mix. Tap water has lime in it that will plate out and clog up the radiator. Also a good idea to fill the block through the thermostat housing to get the block full before buttoning it back up.

If you can find the block drain you might can skip the distilled water flush.

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