There are at least two petcock valves in the area of the water pump that I can see. Just got notice from UPS that the pump has arrived in Tyler (1am last night) and is out on the truck for delivery as of 4:05am, so should have the pump sometime today and will begin the R&R process. Removed the rest of the old coolant yesterday afternoon. I have 12 gallons of Power Cool sitting in my trailer along with 12 gallons of distilled water ready to go in as soon as I can get the new pump installed.
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