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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21615
Experience:  BEng hons Mech engineering, in auto industry 22 years
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iveco strallis 500 putting pressure on water expansion tank

Customer Question

iveco strallis 500 putting pressure on water expansion tank and throwing out water/coolant, dont top up and it will be fine but running hot with fan constantly cutting in, and truck going to limp mode on heavy haulage, fine on light loads, ?????????
Submitted: 3 years ago.
Category: Car
Expert:  Shantal-Mod replied 3 years ago.
Hello,

I'm Shantal and I'm a moderator for this topic.

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Expert:  Matt replied 3 years ago.

Hello

I'd say that the thing to try is a head gasket / block test kit as these take a coolant sample and analyse it for any signs of combustion gas - if present this would indicate the head gasket is on its way out

http://www.uktools.com/block-tester-p-12508.html

then check that the water pump impeller / turbine isn't spinning on its shaft. You should be able to achieve this by removing the bottom hose from the engine and use a screwdriver or similar to feel for the water pump impeller blades, whilst your assistant turns the engine over by hand. If you can stop the impeller with slight pressure from the screwdriver the pump needs replacing.

I'd also suggest ensuring that you've got all the air out of the system as this sort of episode can leave pockets of air trapped and prevent the coolant from circulating properly. So check that the small hoses that run from the top of the engine and radiator that run back to the header / expansion tank are free flowing and not blocked If these are OK then remove the tank pressure cap and run the engine from cold with the heater set to full hot

As the engine starts to warm, squeeze the large hoses running to the radiator to help displace any air - all the time keeping an eye on the level in the header tank, making sure it doesn't drop below the minimum and open any bleed screws built into the top cooling hoses - closing them off as soon as they start to gush water

Once the engine is up to temperature the tank should be quite full. Switch the engine off and leave it to cool Then top up to the mark once its all cold and replace the cap