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Coincidentally, I had a near-catastrophic coolant loss last Friday. Babied it home with the heater full open, and the AC off, since I was only ~ a mile from home when the needle pegged. Let it coll, checked fluids, and added water. Ran an 8-mile test circuit with no problem, but then checked the rcoolant tank...empty!
Tried adding H2O again, and it poured out of the heater hose area behind the block, right near the heater control valve. Figured it was the hose or the valve...parked the car untill Monday, when my mechanic was open.
On Monday, dropped off the car, and gave him my armchair diagnosis (THANKS TO THE BrickBoard). He called back and said the diagnosis was right on...the valve was shot. It was available, and he replaced it with a unit that looks exactly like the one pictured here.
Thanks, BrickBoard!
Harry
1989 745GL, 192K mi
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