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<DIV><FONT size=2>Unless you have a radiator cap that has a higher rated
pressure than it should have, or it is faulty, then the split hose is simply
down to poor quality. Nothing to do with air, if you didn't get all of
that out and coolant was boiling it should simply vent any excess pressure
from the cap. According to Clausager the cap was 10lb until 1976, when it
became 13lb. MGCs had 14lb and V8s 15lb so even those shouldn't cause a
problem.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>You could cause the coolant to boil on a perfect system if the
temps were very high, and you used the car really hard, but that would show on
the temp gauge. However I have found that if the coolant level drops for
any reason, that DOESN'T show on the gauge.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Getting all the air out should need nothing more than filling
the system and first engine run with the nose slightly higher than the rear, and
the heater valve opened. Once that has percolated round and you allow it
to cool and top up as necessary, any remaining air should work its way into the
rad (expansion tank on 77 and later) over the next couple of heat/cool cycles
(normal driving) where you can keep an eye on level.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>However the thermostat can cause a major problem with getting
enough coolant in. They should have a vent, which originally consisted of
a jiggle valve in the outer disc, or a small notch in the edge of the opening
valve. But some here in the UK have had neither, and they trap a huge
amount of air. I've had to drill a 2mm hole in the outer disc of one of
mine.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>PaulH.</FONT></DIV>
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<DIV>Upon raising the bonnet, I saw evidence of a coolant leak, and then found
the split place in the upper radiator hose. The car's been sitting in my
garage ever since as I haven't yet had time to deal with that.</DIV>
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<DIV>Is this the fault of a bad hose, or did I fail to get all of the air out
of the system, or was it just too hot that day to safely be driving the car?
I'm going to assume that I can still find hoses at NAPA, but does anyone have
any suggestions about that?</DIV></DIV></BLOCKQUOTE></BODY></HTML>