Question about 2001 Ford Explorer Sport

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What causes pressure to build in a radiator?

Noticed my explorer was losing fluid. So i got a new radiator cap and topped off the fluid. I noticed it getting hot and before I could shut it down the radiator burst on the top hose. I changed the radiator, water pump and thermostat. I refilled the system to check for leaks and everything is solid. I started the truck to burp it and it still overheats. could it be a problem with the thermostat?

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What causes losing fluid? Water will expand in volume as it heats up. It is supposed to do that. So cooling systems are designed with an air space to compensate for the water volume increase. If you fill it all the way up it should vent out a bit of water when it gets hot. But then the water will collapse when it cools down again. So you can see the cool down water level and don't put more than that in when you refill. Some times an air pocket will be trapped inside the engine if you completely drained the coolant and it will take several over fill and leak out cycles to flush out the air pocket. And as always, if you have weak or deteriorated hoses, they will burst as the water heats up and the pressure increases. The radiator cap should relieve this pressure at about 15 pounds or so. Your hoses need to stand that pressure.

Posted on Dec 12, 2014

  • Tobaris Avery
    Tobaris Avery Dec 12, 2014

    I was burping the system and it was starting to overheat again. the hoses are in good shape. i bought a replacement cap and it was rated for my car, but with the new cap it doesn't pressure escape and coolant pass to the overflow tank

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Cracked head maybe,and are you sure you put the thermostat in correctly ?blown head gasket

Posted on Dec 12, 2014

  • Tobaris Avery
    Tobaris Avery Dec 12, 2014

    The thermostat is seated correctly and its oriented the same as the one 1 replaced.

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Posted on Jan 02, 2017

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