Cooling System

Engine thermostat, how to test.

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The engine thermostat is an important component to the engines cooling system, but for some reason, its removed due to over heating issues.
Engineers have proved that the humble thermostat is necessary to regulate a constant and control temperature range to protect the engine from overheating.

This short video, produced by Darren Gow-Brown Virtualmechanic.com.au, demonstrates an easy way to test an engine thermostat.
Even in a perfect environment, the engine of your vehicle works very hard to maintain a desired operating ...

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Toyota Camry 1990 Temp gauge on high

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In all my time is founder of Virtual Mechanic the following issue with a Toyota Camy tempreture gauge reading high after a short drive would make most people think the repair may lead the a costly repair.
But I cannot take the credit for a very good outcome proving that the real problem was a poor earth connection.
It was Neil Gray of Brisbane that found this problem by going to the trouble of locating a vital earth connection that ...

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COOLING SYSTEM – Welsh plugs

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PURPOSE
Welsh plugs are part of the engine block and the head.  When the engine block and head are manufactured, part of the casting process is that these parts have the welsh plugs fitted where the machines are able to enter and then when the casting is finished a welsh plug is fitted to seal off the cooling or oil system.

THINGS TO LOOK FOR
Welsh plugs can leak at normal operating temperature.  When this happens, stop the engine and get ...

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COOLING SYSTEM – Water recovery bottle

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PURPOSE
The water recovery bottle is designed to recover expanded water and store it and when it has cooled down, the water flows back into the radiator.   Check radiator and the water recovery bottle at the same time. It is best checked when the water is cold. 

THINGS TO LOOK FOR
The water recovery bottle is part of the cooling system.  For this reason caution should be taken when checking the levels as the bottle, if warm, is under pressure.  The ...

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COOLING SYSTEM – Water pump

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PURPOSE
The water pump is designed to circulate water around the cooling system when required.  The water pump is usually driven by a pulley that’s connected to a fan belt and it may also have a fan blade attached to it.  The water pump is usually cast aluminium and designed to operate under a temperature parameter of 13-16 lbs per square inch (psi) at normal operating temperature. 

THINGS TO LOOK FOR
A water pump, over time, may start to leak at ...

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COOLING SYSTEM – Water or Coolant !!!

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PURPOSE
Water is designed to maintain normal operating temperature.  Water will only perform this function if all other components are operating correctly.  Water should include an additive to prevent corrosion and erosion.  If your vehicle is driven in either a very cold or very hot climate it may be necessary to add either an anti freeze or anti boil solution.  This will only work effectively if the corrosive inhibitor is changed every 12 months.

THINGS TO LOOK FOR
The colour of ...

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COOLING SYSTEM – Viscose fan

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PURPOSE
The viscose fan is attached to the water pump and designed to cut in and out depending on the temperature of the water.  The fan will last at least 5 years or 100,000Kms.  After this the fan should be checked periodically every 10,000Kms for its effectiveness.  The viscose fan is a fluid substance that changes its viscosity depending on the heat, allowing the fan to freely move or lock up on a one to one ratio with the pulley.

THINGS ...

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THE NOISE – Thermostat stuck or sticking

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THE EFFECT
This type of problem will give the same affect as a blown head gasket.  It will cause the cooling system to appear unstable.  It may also cause the upper radiator hose to tear apart as the thermostat decides to open with a great force of hot water.

THINGS TO LOOK FOR
If you decide to put another radiator hose on.  What you  need to do is feel the upper and lower radiator hoses at normal operating temperature, very carefully, ...

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COOLING SYSTEM – Thermo fan switch

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PURPOSE

The thermo fan switch when it reaches its designed temperature is designed to switch on and when it reaches a lower temperature, it is designed to switch the power off.  The thermo fan switch receives power from the fuse box.  When it reaches a temperature the switch will bridge the terminals thus turning the thermo fan on.

 

THINGS TO LOOK FOR

Check that the connections are secure and observe that the thermo fan is switching on and off.  Sometimes this may not ...

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COOLING SYSTEM – Thermo fan relay

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PURPOSE
The thermo relay is a heavy duty switch to prevent the request switch from overloading with excessive current or heat. 

THINGS TO LOOK FOR
As the thermo fan operates over years the internal mechanisms may start to wear and cause a resistance in the thermo fan relay causing an overload on to the relay and the fuse.  A common sign is a faulty relay.  Melted terminals on the relay indicate that the thermo fan may be overloading the system or ...

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