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Thanks for all your input. It was the head gasket. Pressure test carried out and found to be ok. Still blows a little white smoke after repairs but great improvement. :) :) :)

Thanks all for the feed back. The smoke from the exhaust is blue but there are occasions when you get plumes of steam. :( :(

My Ford Orion 1.6 LX, Petrol, 1992 model has started to throw out great amounts of smoke from the exhaust and water level dropped dramatically. The oil level also appears to have risen as well. I have looked through the fault diagnostics section in my Haynes manual but unable to find anything...

Thanks brumylad. No the system does not appear to have an automatic bypass valve, i will look into it or remove one of the rad thermostat valves. The Grundfos pump has 3 speed settings 750 rpm, 1100 rpm, 1750 rpm. system comprises of 12 rads 2 which are double. Can you suggest which speed...

Thanks for all your input so far. :P The system has had additional rads added by qualified plumber and been running ok for 12 months with them. All rads have thermostat valves. Put only the hot water on this morning, after 20 mins sounded like the system was going to blow up as it vented...

Yes, two Honeywell v4043 valves, one appears to control the hot water and the other the heating. :?

No room stat or zone diverter valves. Do have valves that divert between heating and hot water. :?

After my heating system has been running for either H/W,C/H or both, the pump stops running after approx 20/30 mins.The boiler continues to fire up.I am unable to get the pump started again unless i switch the system off and leave it for approx 30 mins. All rads have thermostats. Grundufs...