Coolant regulates the temperatures of your engine and keeps everything under control. The engine could totally shut down if it overheats and that would be very expensive to fix. This substance is crucial because if the engine overheats, big problems arise. On the other hand, coolant is used to cool down your engine. Oil is a very essential component in keeping a car engine working properly and keeping the entire engine safe. If too much friction occurs, these parts will start to break down. Oil lubricates these parts so they will last longer. Oil is the main component used to reduce this friction. This creates a lot of heat because of the friction that occurs when they are working against each other. Many of these parts are packed very tightly together within the engine. These parts include gears of all different sizes, camshafts, pistons, and bearings. Since the engine is built up of a lot of different parts, oil is very important. Oil is used in these instances because it can still move between the parts no matter how hot they are. Whenever you drive your car anywhere the engine becomes very hot. The oil will fit into small spaces so that friction does not occur. Oil is a lubricant and it is used to cover different parts of your car’s engine so these parts can move easier. They both serve very different purposes for your car. This could damage the entire transmission and the entire thing could potentially need to be replaced.īoth coolant and oil have different functions and the two should never be mixed. The outcome is not good if the coolant gets into the transmission. If this happens you will notice the coolant will turn pink and start to look foamy. Cracks in the transmission cooler can occur, which would allow the coolant to mix with transmission fluid. The majority of times this is a part of the radiator. You want to make sure none of these parts are cracked so when you replace the head gasket, your system starts working normally again.Ī Leaking Transmission Cooler: Many cars have a cooler for the transmission fluid. These two parts could get damaged if the coolant-oil mixture travels through them. Lastly, you will want to inspect the radiator and water pump to see if they are leaking. Once you do that the entire cooling system will need to be flushed to ensure the mixture is gone. The first thing you will have to replace is the head gasket. If you have a bad head gasket you will need to potentially repair several things. If the coolant leaks into the combustion chamber, you will notice a white cloud of sweet-smelling exhaust. You will be able to see this mixture in the top of the radiator and the coolant reservoir. This causes that milky brown color to occur in the coolant. Before you replace it, you should flush out the entire system and then refill it.Ī Blown Head Gasket: If the head gasket is broken or cracked, oil can leak into the coolant. If you need to place this, both the oil cooler and its gasket will need to be replaced. The good news for customers is that replacing an oil cooler is a much less expensive repair. Since the engine will still perform normally, it can be difficult to diagnose this is the root of the problem. If the oil cooler starts to leak or is cracked, the engine will still perform normally. A blown head gasket typically affects the engine’s performance. If you check that and everything is fine, then you should check the oil cooler. Many individuals will think the head gasket is blown. Or maybe something else.A failing Oil Cooler: If the oil cooler leaks, the main symptom is oil in the coolant. Anyway, I'm wondering whether I need to prepare for another LIM job, or will need to go further and replace the head gaskets as well. I'm not sure if coolant entered the oil while driving it lately, or from my pressure testing. Coolant is running down the driver's side of the transmission bell housing. To find the new leak, this morning I pressure tested to 15psi the coolant system using a hand pump. Then the the engine started loosing coolant again. The water pump and bypass fixed the problem for about 800 miles. FWIW, the carpet was still dry, but the padding underneath was soaked. In January 2023 I started working on the problem and replaced the water pump and bypassed the heater core based on dye results. I have not driven it much since last summer. It was a slow leak until last summer, when it became really bad. The longer story: My truck has had a coolant leak for a few years now. I'm wondering whether I need to prepare for another LIM job, or need to go further and replace the head gaskets as well. It was fine 1000 miles ago, June 2022, when I last changed it.Ģ00,000 miles ago, I replaced the lower intake manifold gaskets. The oil in my 300k mile 1999 4.3L now looks like chocolate milk.
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