![]() Only a chemical flush will remove the sludge. ![]() The residue left behind by the breakdown is very sticky and thick like mud. According to complaints received by Consumer Affairs, Dex-Cool reacts with the plastic sealing surfaces, causing the intake manifold to leak. Unfortunately, this new technology hasn’t worked entirely to the desired design purpose. This coolant was designed to last longer than normal antifreeze, only needing to be changed every five years instead of two. If left untreated, overheating and leaking can lead to very expensive repairs.ĭex-Cool – Some vehicles require a coolant called Dex-Cool. This sludge can block the flow of coolant through the lines which causes the engine to overheat and leak. Once the corrosion begins, rust, sludge and scale build up through the entire cooling system, including into the engine. As it degrades, coolant loses its protective qualities, PH levels change, and corrosion sets in. Radiators, like most parts in your engine, are made of metal. A breach in the system can contaminate coolant with transmission fluid.Ĭorrosion – this is the most common cause of sludge build-up in a radiator. Vehicles with automatic transmissions, the engine-cooling system cools the transmission. Mixing of mismatched coolants can cause the additives to “drop out” of the solution and form sludge or slime.Ĭontaminated coolant – a bad head gasket or cracked cylinder head can allow oil and coolant to resulting in sludge. These additives are supposed to guard against corrosion, cavitation and scaling. The base of the coolant is primarily responsible for providing a protection from freeze and boil-over. Since one of the leading causes of roadside breakdown is cooling system failure, pay attention to the condition of your radiator.Īdditives – coolant consists of a base (typically ethylene glycol or propylene glycol) mixed with additives and water. However, your engine probably overheated because of sludge build-up. You might have noticed it now that you noticed your engine has been overheating. I'm not a shopper but I did shop until I dropped.and so far, my new ***** alternator is working just fine.Have you seen sludge? That thick, brown-colored substance you can see after you open the cap on your car’s radiator. My alternator was cheaper than ebay or auto store prices by buying online from a nationally recognized distributor. Prices on ebay are generally lower due to a lack of overhead costs that stores like Autozone/Advanced Auto/NAPA/Pepboys/etc charge so we reap the savings. Its cheaper than removing the head and finding out you're wrong.And here's a kicker if oil is found in the cooling system, the service manual says to replace the t-stat. If you are concerned about a possible blown head gasket then use a compression gauge to determine whether a head gasket is blown or not. Once all this is worked out, drain and refill with the 50/50 mix. Instead of using more Dexcool, just use plain water for flushing and running until you're assured the heater and cooing system is working and no engine oil is contaminating the cooling system. Spending the time now instead of complaining later about a lack of heat this winter will give you the heat you'll need this winter. Heater cores have coolant circulating all the time with the temperature blend door in the HVAC box closing off air flow into the heater core so heated air doesn't come into the interior. If the cooling system was never flushed right and the heater checked for functionality (whether its hot out or not), how do you know the heater core or one of the heater hoses is blocked? Why not remove the top layer of coolant with a turkey baster or better yet go back and attempt to figure out if the heater is still blocked or not. Finding chocolate milkshake fluid floating scum on top of coolant may be just the blockage suddenly being freed up and purged out of the heater coil. If you never fixed the lack of heat problem then its possible for blockage to leave air in the system. Is there anything else this I should check before I tear the head off this sucker?. Dip stick oil appears normal have not drained oil from crankcase yet to inspect. ![]() ![]() Refilled with Dexcool, drove for 10 minutes, took reservoir cap off to find chocolate milk looking scum floating on top of coolant. Last week coolant level dash light went on. Suspected clogged heater core but not checked (summer came). Heat intermittently came back but was not reliable. Thermostat and Dexcool changed 6 months ago to fix no heat availability in winter. Intake manifold gasket changed 2 years ago to stop high idle, check engine light on and codes being thrown. ![]()
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