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Volvo MD2020 - Found coolant in our bilge
We have a 2002 Volvo MD2020 w/ Sail Drive. This past winter, we had the sail drive seal replaced (routine maintenance). Engine had to be unbolted and moved to allow this.
Recently, after motoring at ~ 3000 rpm for ~1 h, I noticed our bilge was laden with green antifreeze coolant. What does this mean?
I had no overheat alarms (however, I do not fully trust the "idiot lights" on our indicator panel). I had topped up the heat exchanger reservoir with Volvo coolant prior to this event.
Question: What could this mean?
1. Could this mean exhaust gases entering the heat exchanger? If so, how do I test for this?
2. If the thermostat was not opening, could this result in a boil over? Even if I had not seen an alarm or indicator light?
3. Could this simply be a case of the coolant equalizing its volume after I had topped up the exchanger?
The engine has no coolant overflow reservoir, so any excess goes into he engine bilge.
Advice is welcome.