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Date: 09 Jul 1999 14:43:23 GMT
From: gfjohn0751nopsamcomnospam (George F. Johnson)
Subject: Re: Boil over problem


Robert Brown wrote: >Can you explain "boil over" in a bit more detail - i.e. is there a large >surge in >gases from the coolant when you remove the resevoir cap? In that case you may >have >exhaust gases being pressed into the coolant via a leaking head gasket or >cracked >head. A mechanic can analyse the coolant for traces of CO to confirm this. > >If your problem is due to the above, there is often a slight increase in >coolant >temperature (due to high temp of exhaust gases), and the radiator fan should >start >coming on sooner than you'd expect. Have you confirmed that your fan is >starting >up as it normally has done? A broken fan or thermostat switch is a common >cause of >cracked heads on the 8V (I have had bad fan -> cracked head on my 1983 99). >Since >you report _no_ increase in temp, then the problem can be due to something >else >instead. After turning off the engine, the coolant begins to rise in the reservoir. Soon it begins to boil up through the hose and then overflows the reservoir. Enough coolant will be expelled so that the reservoir is empty when the car cools down. The cooling system seems to be functioning properly otherwise. The fan will come on as usual and the gauge reads normal. Occasionally in very hot weather the gauge has read on the high side but never has it gotten into the red. The leaking head gasket/cracked head (I hope not) idea sounds like a possibility. I will check it. Thanks for the info. In the meantime, any other ideas are appreciated. George F. Johnson

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