Corsa 20XE running too hot

[Steve]

Just had the head gasket done and it runs way too hot, fan doesnt kick in at all, just replaced thermostat, rad and fan switch, bridged out the fan and that works. But why does it run so hot? I drove down to the mot station the other day on a cold day with the heaters on max and the whole way there the gauge was just under 100 degrees!! :confused:

[Adam]

Air lock in the cooling system?
Are all the pipes getting hot

[*Adz*]

as above steve, check all the pipes mate, both rad ones, and heater matrix ones etc...

[REDTOm]

not seen you about in this one yet mate i keep hearing about it though i guess this is why lol

Sounds like an airlock to me. waterpump working alright?

Either that or your gauge/temp sender is up the ****ter...

[Andy]

Shagged waterpump,probably caused original HG failure i would suspect

[Grey]

if the fan cuts in at that temp maybe the thermo sensor could try that 1st then waterpump. could try a cold running thermostat from courtenay. have you tried letting it run on idle till the fan actually cuts in and out? if it does then thermostat is doing its job just a dodgy gauge or sensor......

[AlexW]

Fan should kick in at 96 or 98 depending on which it is (Aircon kicks in at 96iirc).

Check the water pump, depending how its plumbed up you should get constant circulation through the left top header tank pipe.

[Steve]

Didnt have a thermostat in when I got it, put one in an still runs the same, bottom rad hose wasnt getting hot before but now with the new rad it does, got some rad flush to try, see if that makes any difference. Already ran clean water through it several times and it nearly overheated at the mot because the idiot tester ignored the fact I said its running too hot, and the rocker gasket split and made a nice oily mess :/ Gauge goes up to 100 and the fan doesnt cut in, even with a new rad/fan switch.

Gonna run a switch for the fan for time being, waterpump is worth doing as no idea when it was done, but normally they sound rattly when they're worn, this one doesn't. Really don't think its an airlock as ive ran it up with the cap off a few times already so don't see how there can still be air in the system.

[AlexW]

Can you see water circulating at any time?

[Andy]

Dont take rattly as gospel,my 2.08v failed epically and i had no idea as the temp gauge read normal,wasnt pumping at all and it nipped up solid

[Steve]

Havent checked heater matrix pipes but the rad hoses both get hot, when i went to drain the rad flush earlier it pressurised back from the rad to the header tank but how can you see the water circulating? lol

[AlexW]

Through the left top pipe on the header tank, It should be coming through there at least.

[Steve]

I don't think so, tbh, ive been doing so many different jobs on it I didnt really take notice!

[AlexW]

Id check that.

[Steve]

Not coming back through to the header tank, got someone coming to look at it wenesday so looks like new waterpump and cambelt while he's there.

[REDTOm]

Should have brought it to me mate

[AlexW]

Yep id say water pump then bud, As said, prob the cause of the gasket going in the first place.

[Steve]

Would make sense, and explains why there wasn't a thermostat in there!

You wanna do it tom? lol

Wanted to have it on the road before christmas but not looking likely now, and insurance runs out new years day so it doesnt make sense to tax it for 5 months and a few days lol