Posted: Mon Oct 31, 2011 4:13 pm Post subject: Cooling system mystery
Covered about 1000 miles this year since my 1928 Vauxhall 20/60 had been treated to a top end overhaul. This included a head skim and new copper head gasket. All seemed fine until recently I notice that after a run the top of the radiator is hot but the lower section is cold. The coolant level is just above the radiator header tank, I topped it up once and obviously overfilled it. It has settled at just above header tank level and seems OK. No evidence of milky sludge anywhere either. What could be the problem? Thank you.
Joined: 27 Dec 2008 Posts: 1116 Location: Chesterfield
Posted: Mon Oct 31, 2011 6:25 pm Post subject:
I expect there to be a significant difference in the top and bottom radiator temperatures.
If there was not the radiator would be faulty!
As long as the engine is reaching normal running temperature and not overheating there is nothing to worry about.
Presumably your car has a thermo-syphon cooling system (no water pump) and that temperature difference is what makes the coolant circulate.
However, in Winter it is possible to over-cool such engines because they generally do not have a thermostat. In those conditions a radiator muffler may be wise.
Jim. _________________ Quote from my late Dad:- You only need a woman and a car and you have all the problems you
are ever likely to want". Computers had not been invented then!
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