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Auto Electrics & vehicle Diagnostics in Tunbridge Wells and Surrounding Area
A11 REPAIRS
Checking the water is again very important as this cools the engine down from the very high temperatures the engine will reach, a basic  cooling system you have a large reservoir “Radiator” a pump which circulates the water , a thermostat which regualtes the flow of water around the engine and a another small radiator in the car behind the dashboard  which is used to warm up your car interior. These days the water is used to cool down other components now such as turbo chargers , egr valves and engine/automtic gearboxes  oil via oil coolers , there are often electric pumps and pre heaters built in to the system which makes it incredibly important that these cooling system are working normally. So how to check usually you will have a small plastic tank called a header tank or expansion tank which will be mounted in the engine bay with flip top cap as there is no pressure in this tank ,Do not confuse this cap with the radiator pressure cap Which are under pressure when hot and will spray hot water at you if opened without caution. Just make sure the radiator is full when cold and engine switched off or check expansion tank when its hot or running. So what can go wrong most common is small water leaks allowing water under pressure to escape and if not topped up will eventually lead to overheatingand premature engine wear and damage, if you have a leak get it checked out ASAP and meanwhile keep a large can of water in the car for topping up “i always travel with a 5l can of water” hoses perish and pop, water joints start to leak , gaskets crack , radiatior cores crack or are hit by flying objects. if you have a minor leak try a radiator leak stopper i recommend “K-SEAL” i have had it seal up two head gasket leaks on disel engines and that is a feat in its own, it wont stop leaks in anything flexible like rubber hoses. So finding a water leak, well mechnics have kits which pressurize the water system to a low pressure, you fill it with water seal the cap and pump up the pressure , the entire water system should hold pressure without dropping if it does its look underneath to see from what area it is leaking from. you look to the highest point you can see water running down, if there is no water leaking down from the engine then it is possible for to be a serious problem such as cracks in the head which will see water fill up in one of the cylinders or egr valve coolers can leak water into the exhaust system or really tricky one is while engine gets upto operating pressure a crack can appear you will often geta lot of water vapour from the exhaust “steam” Lets talk about whats in the water well mostly tap water usually 30/50% and the rest is “summer additive/ antifreeze “ .his stuff is essentially for the lastability of your engine, just because it has water and is sealed it will still rust and oxidise the metals in the engine, if you keep topping up with plain water you will dilute the additives and they will no longer stop the engine components from rusting / oxidising which results in radiator blockages If you look in your header tank or radiator and it looks like sludgy brown muddy puddle water , you should act now, put in a radiator flush and follow the instructions , drain mud water and refill with correct additive for your vehcile which can be red or blue antifreeze or sometimes pre-mixed solutions Try not to mix additives as you dont know what they will do when mixed.