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Where are you finding this? Diesel and water would normally only mix if water was getting into the fuel tank. Are you sure it is diesel? If you are finding it in the coolant reservoir it is more likely to be engine oil. This usually suggests a blown head gasket.
assuming that it should have been diesel then clean out the fuel lines and replace the filters and a few litres of petrol in the tank will mix in with the diesel
if it is a petrol and you put in diesel then it is not so critical as the diesel will mix with the petrol and the oil in the diesel will act as upper cylinder lubricant so up to 5 litres left will be ok
Radiator may have rust/salt deposits inside, if that is case its cheaper and better to change the radiator. Also for future don't use normal tap water in radiator, use a coolant + ph balanced water meant for radiators to reduce salt buildup inside radiator.
Also check the radiator fan is working ok and rotating in the right direction, sucking cool air inside not blowing out hot engine air to the radiator. Some electric fans can have wires mixed up so they start in the wrong direction. (make sure fan is sucking cool air outside towards the engine).
In some cars, radiator fan has a top cover that stops hot engine air getting sucked by the fan, if your car has it, make sure it is fitted properly and is in good order.
Some cars have a fan fitted on the AC condenser, make sure this fan is working as well.
there is no connection between the coolant reservoir and the diesel tank. However when running diesel fuel becomes hot from the return fuel from the injectors that is used to cool and lubricate the injectors. Diesel tanks are vented to the atmosphere and so condensation forms in the tank when it cools down. This accumulates and is picked up and goes to the filter ( should have a water separator in the system) Left untreated a moss grows in the fuel which blocks filters and injectors Use a diesel fuel conditioner to control the rubbish A method of controlling water in the tank that is used by all long distance operators is to fill to the top every time before shutting down for the night.
This is typical of o-ring "seals" in the injector systemof the 4JX1 engine losing seal quality which will mix oil and coolant together and return both into the fuel tank and radiator. Smell the radiator. Most likley will smell of diesel fuel and perhaps show oil if you dip a timber ice cream stick into the radiator. Often occurs after overheating (towing or low on coolant). Buy an electric "ratchet" pump on eBay if you are going to fix the injectors [1 0-ring] yourself (and the sleeves [2 o-rings] per cylinder. You need a sleeve removal tool also. Instructions are available on Australian 4WD forum. The pump is to pump out of the fuel tank before you start the job. Take the input fuel line and hook into the pump. A plastic tube of the right size onto the outlet side and energise the pump. Drain into a 2 litre container(s) until diesel shows up instead of water. Drain the coolant before starting the engine repairs as some coolant pipes are made with rubber component pipes and could deteriorate if left too long. You need a copy of the manual (free online - do a search). You need to tighten the oil rail and injectors to the routine given to ensure good sealing. New copper washers for the injector ends are essential for good sealing. Ive had good results from using old rings for sizing and replacing with Vitane o-rings from hydraulic supply dealers. Label clearly when purchasing. Do not use standard rubber as they are not temperature rated. O-ring on internal injector plunger is "ceramic" and is not feasible for normal repairers and is usually not required. .RichW
you may have two hoses that hooked into your radiator that help cool you oil. If the radiator breaks down inside than you need to replace the radiator. The radiator probably has four tubes or hoses bolted to the tanks. Two four transmission two for cooling oil. If so you need to replace the radiator and flush out the cooling system and clean out the water jug. Do not wait long cause you could clogg your heater core with oil. and also cause the vehicle to over heat and that is not good for diesels.leave comment
try using the Toyota Factory Pink Fluid (part number 08889-80071)
the bottle says: "Genuine TOYOTA Pre-mixed Anti-rust Anti-freeze / Super Long Life Coolant is a new generation ethylene glycol-based premium engine coolant, offering excellent corrosion formulated specifically for all TOYOTA warranty requirements. For vehicles fitted with Super Long Life Coolant at the plant, it is highly recommended that Super Long Life Coolant be used for maintenance."
I would check the color of the diesel in the fuel tank first. Siphon a small sample out into a clear container. If it has a yellowish apperance to it and is not transparent combined with the fact that you are losing water I would strongly suspect the injector tubes in the cylinder head. The coolant passes around them so when they leak you can get water in the diesel and diesel in the water. That would the most likley cause, the other possibility is a cracked head. The air conditioner does use water at all. It condenses water on the coils from the air and drips down, more so on humid days.
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