ANYONE HAVE ANY IDEAS?
Heater started blowing cold, wouldn't get even slightly warm unless I revved the tits off of it.
Opens bonnet, sees that coolant is dark red (was clear before) and almost completely filling the expansion tank.
Leaves 24 hours at least - comes back and coolant level still high and to my surprise still slightly pressurized.
Drained coolant, flushed, re-filled and ran for a further week, temperature gauge reacts normally as usual, no overheating / over-cooling or any indication of anything wrong at all apart from cold heater.
Takes coolant system to pieces, flushes everything out again bit by bit and finds that the oil cooler is a little restricted.
Replaces oil cooler and puts everything back together including new thermostat for good measure.
At last heater starts working.
Three days later and blowing again hot cold hot cold with dark red water, engine temp still fine.
HELP this rolling crap-heal lest it be scrapped..