engine overheatin problem

[Shea]

the other day was driving and after about 20 mins the engine temp had rose to about 3/4 and was still rising, after staying just short of the line at the top for a few seconds it dropped straight to half way.... short journeys it seems to be ok... or doesnt raise any more then 3/4 of the way... but as soon as i start going faster or longer it will raise and drop again.... just to top it off today it rose to 3/4 then droped to 1/4 in a matter of seconds :S had a mate with a 106 tell me its ether my head or my thermostat ???
before anybody suggest head gasket, theres no mayonaise around the filler cap, no water in the oil, no smoke from the exhaust and no water on the inside of the car ( thinking could be heater matrix?)

PLEASE PLEASE PLEASE HELP.... Seems To Be Problem After Problem :wall:

[Shea]

p.s sorry bout fat essay

[huricane]

air block in your water works :oops:

[shezzo]

my temp goes up over 3/4 but only wen im at a stand still wiv engine running even at traffic lights sumtimes but wen i drive no matter how far it stays at half wat could this be??

[Lew_C]

my temp goes up over 3/4 but only wen im at a stand still wiv engine running even at traffic lights sumtimes but wen i drive no matter how far it stays at half wat could this be??

called an old french engine lol, mines the same.. don't worry.
could fit a lower temp thermostat though.

If you read any manual anything in between overheating and cold is normal running temps, some engines to just run hotter, my HG has been done twice now with 2 head skims, fair bit more temp etc.

[rosco27]

Could be an air lock. Have you tried bleeding it? I would maybe try that first as it won't cost you anything and could fix it?

[geoffgti88]

Is the radiator fan working? it should automatically start when temperature reads 3/4

[shezzo]

ye that works m8 it kicks in but i afta have heatin turnd rite up n boot it down the road before it cools down

[Shea]

overheating problem sorted :)
took the old thermostat out and it was ... well ruined and siezed . so replaced that and changed all coolant, bled it through and now its not been over half for more than a 1min n av bin drivin all nyte (y)