>> I am Very new to MG's and I am reviving a long mistreated 74 midgit.
>> weekend I took it out for a nice drive and other than some occasional
>> bucking that i attributed to water in the tank (i live in PA) she drove
>> fine. But when I got home I saw that I was leaking antifreeze out from
>> under neath the overflow bottle cap. Once the car cooled i heard a
>> gurgling sound. when it completely cooled I opened the radiator and saw
>> that it was filled. The coolant was nice and clear/green. And the oil
>> was also clear.
That isn't actually an "overflow bottle", it is an expansion tank. The
difference being that the tank is part of the pressurized system. Due to the
nature of the car, the radiator is not the highest point of the water
system, therefore it does not make an appropriate place for air bubbles to
collect or for filling the system. Ideally, the expansion tank should be
about half full when cool and the radiator should be full. The cap on the
expansion tank is, obviously, the pressure cap for the system and it might
not be a bad idea to replace it, since any leakage should have come from the
spout off of it rather than the cap. You might also want to do a compression
check just to verify the state of the head gasket, although I doubt that it
has a problem.
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