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overheating?

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Bobtail:
on the way to work this evening noticed the temp gauge getting
very high so turned heater on full blast and heating on full temp
and there was only cold air coming out
so pulled over and released water filler cap and water bubbled out
and i could hear loud bubbling sounds from header tank
when it had finished bubbling removed top and filled up water
started engine and refilled water again
put cap back on and started off again 2 miles down road the temp
gauge started to rise again pulled over again and now the funny thing left
in ticking over to check under bonnet and temp gauge started to go down
left it for ten mins and all seemed ok started off again and temp gauge
started to rise then fell back to normal running temp and heater
started to blow hot air  
any ideas?

head gasket?
thermostat?
air lock?

help very worried :-k

muddysteve:
sounds like an air lock if all is well now, could have had an airlock in the heater matrix

Steve

bilge rat:
as said before sounds very much like an air lock ! ,the concerning thing is how did it get there ,have you had any of the coolant drained down recently. iff not could be cause of head gasket gone between cylinder and water jacket, ive heard though this is un common as 300s normally go on no4 at the back of the block. dont know weather it works on deisels but you could take the water pump belt off ,brim the header tank making sure no air in system first and run for about 10 to 15 seconds (you dont want it to hot)see iff you get a stream of air bubbles ,hopefully you wont ! .iff ya do good chance of gasket trouble, hope this may be some help...

Niel:

--- Quote from: "BOBTAIL" ---on the way to work this evening noticed the temp gauge getting
very high so turned heater on full blast and heating on full temp
and there was only cold air coming out


head gasket?
thermostat?
air lock?

help very worried :-k
--- End quote ---


Check the plug in the rad hasn't split, BTDT.

RS sell some nice chrome plated brass ones that fit ;-)

Niel.

Mace:
The bubbling could be the sound of water boiling coz it's got too hot. They then get stuck at a high point i.e the heater matrix. Releasing the cap releases the pressure and releases the air. I would have thought an air lock alone would have presented itself earlier than this. That said, you've just had the cam belt done so maybe the air got in then.

You may have a blockage in the coolant system, radiator is a good point or a partialy seized water pump. This would have caused the orginal rise in temp. The pressure build up could have blown it clear so things are now as normal.

Check your oil filler cap for water residue and keep and eye on the coolant level. If all seems well in a couple of days it's probably past, if not it's something serious.

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