This definitely sounds like combustion gasses getting into the coolant.
Probably a seal leak at the heads or a cracked head. Running a leak-down
pressure test on the cooling system is in order at the least. Also a
sniffer test to reveal the presence of exhaust components in the coolant.

Sorry for the bad news.

John Rodgers
88 GL Driver

Richard Ferguson wrote:

> Hi Again,
> Just to recap and try to not bore you with all the details let me start
> by saying I have been back to the dealer six times trying to resolve
> the coolant system problem that is plaguing me...in the process I have
> a new H flange, new radiator, new radiator sensor, new fan switch, new
> coolant reservoir sensor, new battery (due to the fools not replacing
> the sensor on the new radiator and causing the fan to run continuously
> till it killed my battery), new switch that goes on the engine near the
> reservoir, and a new thermostat, the system has been bled
> repeatedly...The problem is persisting. Something is forcing the
> coolant back into the reservoir and then into the overflow tank...after
> driving on the freeway and then coming to a stoplight and idling the
> temp gauge starts rising...the engine is getting too hot...when I look
> in back the overflow tank is completely full and the coolant is
> bubbling on top...can anyone help me discover what this might be? This
> dealership is supposed to be good and the independent shops in our town
> are both ripoff artists. Thank you in advance for any helpful advice.
> Rick
> 85 Westie
> 2.1 upgrade
>
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