Saw a bit of steam on the way to work (was stuck in traffic) out of the bonnet, nowhere to stop as I was on a busy dual carriageway, anyway I whacked the heaters onto full blast which cooled the engine down a bit. When I got to work, had a quick look under the bonnet, the coolant was about 2/3rds of the way up the tank and bubbling...I left it idling for a bit longer and the fan didnt come on as it usually does, possible fan switch gone??
Also the rad hoses were hot as was the rad so I think the thermostats ok?
Firstly with the ignition off (!) try rotating the radiator fan by hand - if its stiff or stuck, replace it.
Then short out the radiator fan switch with a bit of wire and the ignition on. The fan should come on straight away. If it doesnt then you've possibly got a faulty fan or you've blown the fan fuse. If the fan comes on ok then you've possibly got a faulty radiator fan switch.
unplug the switch and bridge the female plug which goes to the fan.
This completes the circuit and the fan will remain on all the time.
Over winter your car wont warm up for ages if you leave it so you should get the switch before then.
Just pull the plug off the fan switch and bridge the terminals on the plug - that will tell you a lot about whats happening. Connecting the fan directly to the battery can be a bit dangerous if you accidentaly short out the connection (lots of smoke/burns/fire etc )
My brother had a similar problem with a 1.6i 8v engine in his Astra (basically the same as mine) in the end the thermostat had to be changed as it wasnt letting enough water through to cool the engine, he said the hoses were hot also...I understand te cambelt has to come off to change this?
Hope I can get it sorted, the engine has done 80k FSH.
its no that bad mate, alternator belt off, cambelt cover off, line up the engine, undo the tensioner, take belt off, take off top pulley, then you can get to the thermostat housing, depends if you like spanners though i suppose
well, if you follow the haynes you should be ok, i had a similar thing to this on an astra 1.6 it was the thermostat too, so that would be my guess with yours too, waht temp does it sit at when driving around?