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By Steve Barragan
I have a 1997 chevy suburban 4wd and while in 4wd it was making a loud clanging noise when accelerating in 4wd hi or 4wd lo. Anyways everything underneath was tight and no play. I couldn't figure it out. It has the dash 2wd 4wd hi and 4wd lo electric switch it wasn't flashing while in 4wd hi or low and you could hear an engagement sound when 4wd selected. I thought it maybe it was the front crown and pinion gear missing a tooth. I took it to the mechanic and it was the 4wd actuator! I guess it was gimped up and engaging and disengaging while in 4wd and making a horrible clanging noise. Anyways I replaced the actuator myself a few years ago (which was possibly the easiest repair ever) but the 4wd light was flashing and it wasn't engaging at that time. Anyways it cost me a fair bit more to have a mechanic diagnose and then replace the actuator but if it happens again I'll know what it is. Also I may be able to help someone else searching online for an answer. It's a fairly cheap fix to do yourself and super simple to do. About $60 from 1aauto! Hope this helps someone out.
By The Cowardins
2014-2018 Chevy Silverado's and GMC Sierra's have a problem with cycling of the thermostat that causes stress fractures on the radiator leading to coolant leaks. Attached are GM bulletins on the 2014 and 2015 models. As one can see they have provided special coverage on the 2014 models to 5 years or 100000 miles for this problem.(Bulletin 15829) This is not true of the 2015 like mine although they use similar verbiage in the bulletin P11513A and P11513F. This problem can also exist in 2016-18 models according to what a mechanic told me. It should be noted that Bulletin P11513A and F also applies to 2015 Cadillac Escalade Models, 2015 Chevrolet Suburban, Tahoe, 2015 GMC Sierra Denali, Yukon Models, Yukon Denali Models Equipped with 4.3L, 5.3L or 6.2L Engine (RPOs LV1, LV3, L83 or L86).
Anyone regardless of year and mileage with this problem needs to report this to the National Highway Traffic Safety Administration (NHTSA) using the compliant form ( https://www-odi.nhtsa.dot.gov/VehicleComplaint/) or calling the hot line at 1-888-327-4236. With enough complaints the NHTSA may force GM to issue a recall or provide extend coverage. Even if you have had this repaired filling a compliant may get you reimbursed for your costs.
Another option is to file a compliant with the Better Business Bureau. They have a compliant form on line just type in BBB Car-Truck Compliant in your search engine. It will not hurt to file a compliant with both the BBB and NHTSA. Although If you are going to do this file with the BBB first as they will not accept your compliant if you file with the NHTSA first.
2015 Radiator PI1513A.pdf
2014 Radiator Special Coverage 15829.pdf
GM Bulletin P11513F January 2019.pdf
Contributing Writer, GM-Trucks.com
General Motors has announced that NHTSA is mandating a safety recall for the following vehicles:
2014-2018 Chevrolet Silverado and GMC Sierra Pickups (1500 / 2500 / 3500) 2015-2018 Chevrolet Suburban, Tahoe, GMC Yukon vehicles 2015-2017 Cadillac Escalade
NHTSA reports that the amount of vacuum created by the vacuum pump may decrease over time. The group says that as the vacuum level drops, the brake assist decreases, and that this increasing braking effort, extending the distance required to stop the vehicle, thereby increasing the risk of a crash. This new recall covers 3.4 million vehicles.
The Problem: The brake pump uses engine oil to lubricate itself. If the pump becomes clogged with engine oil sludge the units ability to create vaccum is diminished over time. As a result, braking force and ability also drops. The issue is usually accompanied by a "Service Brake Assist" warning message in the dash.
The Fix: GM will reprogram the computer that controls the secondary brake assist pump. The secondary pump will now activate at lower speeds and different situations quicker to compensate for any lost output from the main pump. Since the pumps are not failing, GM has decided not to replace them.
GM's number for this recall is N192268490. In compliance with federal law, GM will notify owners, typically by snail mail. GM says that its dealers will reprogram the Electronic Brake Control Module. However, GM has not yet provided a notification schedule. Owners may contact Chevrolet customer service at 1-800-630-2438, Cadillac customer service at 1-800-458-8006 or GMC customer service at 1-800-462-8782.
If you own one of these vehicles and wish to check to see if your vehicle is included (or not) you can do so at this link immediately.
As with every safety recall, customers will not be charged by GM for the needed repairs or modifications.
NHTSA's public information on this issue indicates that many accidents have been reported to NHTSA including some with injuries. This recall is the result of a NHTSA investigation that lasted nearly a year. In its investigation report, NHTSA noted the following details about the problem:
I know the 6112s are semi-new to the community. My question is what would be the lowest possible notch I can install these and still have enough clearance to fit 275X 65R 20 KO2s. I’d imagine the notch settings are similar to the 5100s accept there is 1 extra notch I believe. I have been searching online for the past week and cannot find anyone that confirms the lowest possible setting to fit these tires. I know I can install them at the highest setting and fit just fine, But I am trying to keep rake in the rear due to occasional towing and i do not want to add a leveling block to the rears. I was thinking the third notch (1.25” of lift) would work but I’m not sure if It will get rubbing. Does anyone have any idea on this? I currently have a 2.5 inch leveling spacer but do not want to install it when I switch to the Bilstein 6112s. Thanks!
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