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By Grumpy Bear · Posted
Curious @newdude, how does this change when a 6L80 is either fitted with a billet converter OR is behind a V6 whose converter isn't a pile of junk? Oh, and are you saying in the above the 4-5-6 clutch's burning up is the result of the converter/pump induced failure or they are just fragile? Thanks in advance for any feedback you may be willing to give. -
5.3 Sierra with approximately 80,000 miles had a radiator replacement about 6 months ago which required pulling the AC condenser and a vacuum and recharge on the system. AC cooled fine until about a month ago, when it would suddenly start blowing lukewarm air for 5 minutes at a time at various points throughout the day, then suddenly resume cooling again. Sometimes its when stopped at an intersection and other times while moving. I've read about the internal electronics in the compressor going bad on these trucks and not cycling properly, but sounds like many dealers just chase AC issues with a parts cannon. Also wondering if they charged it correctly when the radiator was replaced. Is there an easy way to see if these electronically driven compressors are engaging properly, or to check for freeze up, etc.? Dealer usually wont do much unless they can replicate or I can show them a video of what's going on. -
Apparently it doesn't trigger a fault, at least according to my dealer, but in one month its gone from once or twice a week to several times a day, so you can catch it on video and its likely to be seen by the dealer. I've heard some have replaced only the switch, yet others have required full shifter assembly replacement to the tune of $900+?
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They don’t even try to hide it anymore. The barrel of ticks up, bam so does gas in mere hours. It takes weeks to reverse. 3.39 @ Kroger’s in Montgomery Tx. Up 30 cents. -
8 > 6 Your mechanic needs to have hung around a dealer or transmission shop over the last 5-10 years. He'd change his mind. 6L80 has a higher issue rate for sure. Torque converters, fluid pump gets wiped from converter failure, 4-5-6 clutches burn up, the TEHCM gets wrecked from the clutch debris from converter failure, some burn up hard parts too, etc. 8L90 has its quirks but if you change the fluid regularly and use the right fluid, its been a more reliable unit over the 6L80.
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