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Mechanic Martyn
Mechanic Martyn, Mechanic
Category: Car
Satisfied Customers: 1002
Experience:  Advanced trade certificate in Automotive engineering
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The cooling water system, a blown hose on the radiator..V8

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I have excessive pressure in the cooling water system, a blown hose on the radiator and have been loosing water on my Range rover 4.6 V8 96 model. what could cause this ?

Hello excessive build up of pressure in the radiator is usually caused by a blown head gasket or a cracked cylinder head.

This causes combustion pressures to overload the cooling system and symptoms such as you describe to occur.

You can test for this with a combustion gas leakage test kit available from your local parts store. It consists of a tube that attaches to the filler neck and inside you place a little of a special indicator fluid.

You start the car and generally on most types squeeze a rubber bulb on the tube to draw gases from the cooling system into the tube. If there is a blown head gasket or cracked head the fluid will change color. The kits cost about twenty dollars and are readily available - even through amazon or ebay.

regards

Mechanic Martyn

Mechanic Martyn, Mechanic
Category: Car
Satisfied Customers: 1002
Experience: Advanced trade certificate in Automotive engineering
Mechanic Martyn and other Car Specialists are ready to help you

The Rover v8 has been known to demonstrate the signs you have explained when a head gasket has failed or a cylinder sleeve has slipped. With the age of your vehicle I am going to lean towards a head gasket leak. Either way the truck should not be driven until proper diagnosis is executed. I recommend taking the truck to a mechanic and paying for 1 hour of labor time for a compression test... All cylinders should be 130 or higher and deviate less than 10 percent between cylinders. Keep us posted.

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