Iveco 18 tonner cooling system being weird

[Al Cormack]

Cooling system on my lorry was being weird today. All was fine, then blower started blowing out cold air, temperature gauge climbed right up, then dropped back to about 50, then started warming up back to 85ish, and blower blew out warm air again.

It did this a few times today, but not always with the temperature gauge right up. Cooling system is just standard radiator, header tank, thermostat and water pump.

Any ideas what is failing?

 

Cheers

Al

[dumper]

Have you got correct level in radiator?

[Al Cormack]

Just below max on header tank. It’s like an air bubble moving around the system, or lump of muck?

[openspaceman]

4 minutes ago, Al Cormack said:

Just below max on header tank. It’s like an air bubble moving around the system, or lump of muck?

Air bubble or combustion gases?

[Al Cormack]

2 minutes ago, openspaceman said:

Air bubble or combustion gases?

Hopefully air bubble! 

[dumper]

Have you run the engine with the lid off the header tank see if it bubbles?

[Baldbloke]

Definitely bleed out the system and if it’s as cold where you are as here check the antifreeze strength

[wicklamulla]

looks as though Al has found a fix for this from what i have seen on Facebook marketplace.

[Al Cormack]

looks as though Al has found a fix for this from what i have seen on Facebook marketplace.

Leaky pipe letting air in. Tightened jubilee and bled system, all good.

It’s up for sale because I’ve found the same thing in a 26t version that’s coming on the market soon [emoji1360]

£8500 + vat if anyone is interested, complete with grab and 2 bodies. Big chip bin and a flat bed with bolsters and 5t tie down rings.

[monkeybusiness]

1 hour ago, Al Cormack said:

 

Leaky pipe letting air in. Tightened jubilee and bled system, all good.

It’s up for sale because I’ve found the same thing in a 26t version that’s coming on the market soon

£8500 + vat if anyone is interested, complete with grab and 2 bodies. Big chip bin and a flat bed with bolsters and 5t tie down rings.

 

Any pics/details of age/mileage/payload etc?