![]() I flushed it by removing the lower hose, I didn't want to mess with the drain plug due to the advice given earlier in this thread. I flushed out everything, and there was definitely alot of brown that came out while I was running the heater. So I just bought a t-stat, they didn't carry the powertech one, so I just bought the Napa premium one for around 22 bucks. Seems like it is starting to crack, though I do not believe it leaks at all now. On the phone they said they carried the overflow container, but once I arrived, I was informed that it was a dealer item, so that will have to be replaced later. I went to NAPA, was planning to buy a replacement overflow container and my thermostat. When I removed the thermostat, I noticed that some grime was sort of stuck in the coil there, no doubt causing my trouble. I don't know the last time the system was flushed, but seems like it had been awhile and something I should have done a lot sooner. As I was draining it, I took off the overflow tank because that really needed special attention, it looked like it was lined with mud. So Saturday 1/23 I set out so do my flush. There are two fans there, and one is probably for the AC.and yes I do get hot air when running the heater, but maybe even more hot when running the vent. If I get back in the car to drive, it just stays running hot. Same thing this morning, temp seemed fine, then shoots up when I turn it off. When I turned my car off, it shot up to 260. Last night I was able to drive home and the temp stayed where it should, right in the middle, maybe around 180. When I started driving again the temp shot up near 260 and the light came on and stayed on the entire way to work. I drove to work the next morning, and stopped at a gas station about 5 miles into my trip. I made it home with the temp right about 250. Going uphill it would go into the red and my light would come on warning me it's hot. When I turned the heater off, it would shoot back up. I turned on my heat hoping to cool it down, and it went down to about 240. About half way home I noticed that my gauge was showing that I was running hot, about 250. I was driving from Flagstaff to Phoenix and it was snowing. No thanks.Thanks! Ok, here is the update.well the full spectrum of my problem. 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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