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The 740 turbo made it to town and back yesterday, with about 10 miles of running around while up there. Total mileage about 65 to 70 miles. I let the car sit over night, about 11.5 hours, before checking the coolant and it was only about a pint below where it had been before the trip. So, possibly a bubble from refilling.
However, here is what really confused me: After sitting for 11.5 hours, the thing still had pressure in the cooling system! No way to tell how much, but I don't think it was the full 150KPa, but still considerably more than just a little "pffft" when I opened the expansion tank cap to top up this morning. And it was, beyond doubt, positive pressure, escaping from the tank.
Is holding pressure all by its self that long good or bad? I am in Florida, it was in the 90+ degree range when the car came home yesterday evening, and never went below about 72 in the garage overnight. And the insulated hood was closed over it. Could the core of the engine been kept warm enough to keep that much pressure? Does this indicate that a pressure test is not necessary because it did hold pressure for so long? Is it a bad sign of head gasket or head damage? Or does it depend on whether or not it is low on coolant when it comes home this evening.
BTW, it is running perfectly, no roughness, there is no milkshake under the oil cap, oil on dipstick is fine, all gauge indications are normal, no idiot lights, etc. Am I just freaking out here for nothing but a sloppy fill job that got a huge air bubble in the cooling system on Sunday? This is driving me nuts, and even if it clears up, stops needing little bits of coolant, etc., I'll probably take it in for pressure and compression checks this week.
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Scott Cook - 1991 745T, 1985 RX-7 GSL-SE, 1986 Toyota Tercel (Don't laugh, it is reliable, faithful AND gets 41 mpg!)
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