![]() At the same time, coolant/antifreeze flows into the cylinder head through the leak in the head gasket. In the case of a blown head gasket, air enters the cooling system and causes bubbling. Cooling systems are pressurised to raise the boiling point of the fluid, with the pressure cap and the overflow helping to raise the temperature at which the coolant/antifreeze boils. When there’s a leak in the cooling system, the pressure of the liquid drops and so does the boiling point of the coolant/antifreeze. Why does air in the cooling system cause overheating? This escaped air causes bubbling in the coolant/antifreeze reservoir, which can often be mistaken for boiling.Īside from a blown head gasket, there are several other causes for air inside in the cooling system, which we’ll come to later. One of the most common causes is a blown head gasket, in which the air pressure inside the cylinder heads is transferred to the cooling system. When air gets into this sealed system, air pockets can form and cause blockages, which can lead to bubbling and overheating.īubbling indicates rising air pressure in the cooling system, which is a sign that the flow of liquid is blocked by a pocket of air. No thanks.Cooling systems in most cars are pressurised, and rely on a leak-free closed circuit of hoses to pump coolant/antifreeze around the engine. I would not use Dexcool in a vehicle where it came with something besides Dexcool from the factory.Ī flush at PepBoys would likely get you a flush using tap water and universal coolant added. And change the coolant as listed in owners manual. And you have to make sure cooling system is air tight. There were issues with a few engines that needed some new design gaskets. Your article and the discussion of problems is very old news. Peak Global Lifetime is the same coolant minus that chemical. Https:/ / news04/ 2006/ 08/ gm_dexcool.htmlĭexcool contains an aggressive plasticizer chemical. GM has been having problems with Dexcool since they started using it in 1996. Lets say you keep cruising with Dexcool mysterious problems will happen like a leak in the radiator.a leak in the coolant reservoir.etc. Pepboys seems best equipped around here to perform these fluid flushes. The best thing you can do is get the "Dexcool" coolant flushed and replaced with Peak Global Lifetime. Im in the livery ed to own a Suburban.know a lot of people with these vehicles. The system is still clean all round with zero issues at 135,000 miles, which is stil less than half that of the Avalanche. I flushed out the factory coolant on the Envoy when I replaced the factory thermostat at 56,000 miles and again when I replaced the water pump at 115,000 miles. I no longer have the Avalanche, but I personally know the person who now has it with 293,000 miles now and he's got no issues with it either. thermostat or water pump, the system was thoroughly flushed and back flushed and refilled with premixed Dexcool. Whenever a cooling system repair was performed, e.g. The LM7 5.3L I had on an old Avalanche didn't cause me any grief, nether did the LL8 4.2L in my Envoy, both of which have been running Dexcool since they left the factory. I, personally, have never had a problem with Dexcool. Newer gasket material, primarily HNBR with aluminum frames addressed the problem, but until that point both GM and some aftermarket manufacturers were paying for warranty claims. The plastic would soften, swell and eventually leak. The root cause was air in the system, which caused acid to form when mixed with the coolant and attacked plastic carrier gaskets. By the early 2000s, manifold gasket failures on the 3.1L/3.4L as well as 4.3L, 5.0L and 5.7L using plastic carrier gaskets with moulded silicone was common. Back in '96, GM made the "mistake" of calling Dexcool a "lifetime" coolant. ![]()
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