Converter - Coolant issues.

[101RRS]

Driving around in the 101 today on petrol and filled up with LPG and switched over to it. Engine started missing about 10 minutes later with typical symptoms of a frozen converter - the coolant for the converter is on the same line as the heater and I had turned it off as it was a warm day and had not turned on the bypass. I switched on the bypass but the engine was still missing due to a frozen converter but there was no hot water flowing through the system. I turned on the heater which still had no hot water running through it. All pipes were cold - water level is correct (I have a very sensitive low water alarm) so it would seem the LPG converter was blocking the water flow.

I switched back to petrol and all was OK and then parked for some lunch. When I started up heat was back to the heater, switched to LPG and all is OK.

So is there anything in the converter than can stop water flow or can the converter freezing get so cold that it actually freezes the coolant when the coolant is not circulating?

Thanks

Garry

[bee utey]

Propane evaporates to atmospheric pressure at minus 40°C so is perfectly capable of freezing coolant even with anti freeze added.