- #26 of 105
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Re: Humming Noise [repairdog]
by lincoln6echo
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Jan 24, 2007 (4:35 pm)
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Replying to: repairdog (Jan 24, 2007 2:24 pm)
Yeah, Timken is what I bought to replace my bearing.
One other question for you. Is there anything else I should be ready for to go next that is common?
-2002, 2dr. 2wd. blazer 4.3L 51,900 miles
Thanks, Lincolnsixecho
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- #27 of 105
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Re: Humming Noise [lincoln6echo]
by repairdog
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Jan 25, 2007 (2:35 am)
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Replying to: lincoln6echo (Jan 24, 2007 4:35 pm)
Possible alternator and ac compressor around 75k but varies. Flush the cooling system 3/36 or 3/50k min (not 5/100 GM BS) or the Dex cool will clog things up and get a Stant cap and new 195 thermostat at the same time. Keep the overflow to Hot line when cold so no air gets in the system and you should be good. Do not forget the trans filter soon also (every 50k). Spray the door pins/bushings with white lithium lube to save those too. Finally when you do the brakes for those rears buy "loaded" brakes so you get rebuilt calipers/bracket/slides/pads cause the rears like to stick after just pads - good news fronts are tougher so just pads OK. Good news is the ball joints on 2wds are much bigger than the failing 4wd ones!
They have a few problems but handle well, take a crash pretty well with the frame under them, and ABS works well.
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- #28 of 105
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Re: Humming Noise [repairdog]
by jlflemmons
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Jan 25, 2007 (10:45 am)
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Replying to: repairdog (Jan 25, 2007 2:35 am)
repairdog, you are a wealth of information. I deal with a lot of questions over on the Hyundai board, but since we bought the kid a '99 2wd 4dr Blazer, I have been reading through your posts.
We bought one with 77K miles, but looks to have been well maintained. Swapped out the shocks (original) idler pulley and belt, and, of course, the stupid door hinge pins. I have never owned a car or truck where the pins have worn out. I guess oiling them a couple of times a year helps, but every Blazer/Jimmy we looked at had the bushings worn out. Strange. Next will be tranny service and coolant, then probably a muffler/tailpipe. Sounds like a baffle has let go in this one (also original). Engine is smooth, and tranny shifts as it should, so we will see where we go from there.
Once again, thanks for all your posts!
Jim
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- #29 of 105
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Re: Humming Noise [repairdog]
by lincoln6echo
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Jan 25, 2007 (12:33 pm)
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Replying to: repairdog (Jan 25, 2007 2:35 am)
This is great info! This will be on my "to do list". Can you tell me what this means tho--> Flush the cooling system 3/36 or 3/50k min (not 5/100 GM BS).
-Thanks. 
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- #30 of 105
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undercarage noises
by firstshirt1sg
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Jan 27, 2007 (9:12 am)
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Replying to: lincoln6echo (Jan 25, 2007 12:33 pm)
When I start my 2000 Chevy Blazer in the morning there is a loud ratting noise underneath as if something is loose but after the the vehicle idles for a minute or so the sound stops and is not heard during subsequent starts unless the vehicle sits for an extended period of time, it sounds as if it is coming from the exhaust but my investigations have revealed no leaks or loose part. Can anyone help?
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- #31 of 105
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Re: undercarage noises [firstshirt1sg]
by lincoln6echo
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Jan 27, 2007 (12:04 pm)
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Replying to: firstshirt1sg (Jan 27, 2007 9:12 am)
maybe check to see if there is a heat shield on the cat. convertor. that maybe loose...and when you first start it up, the heat shieled may be rattling off of the catalytic convertor. It's happened to me like that. Try checking that maybe.
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- #32 of 105
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Re: Humming Noise [lincoln6echo]
by repairdog
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Jan 28, 2007 (4:43 am)
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Replying to: lincoln6echo (Jan 25, 2007 12:33 pm)
3 years/36,000 miles etc.
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- #33 of 105
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Re: undercarage noises [firstshirt1sg]
by repairdog
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Jan 28, 2007 (4:50 am)
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Replying to: firstshirt1sg (Jan 27, 2007 9:12 am)
Could be exhaust or you are lucky you have one of the 99-01 Blazers with secondary air injection that has a pump under the radiator that blows air into the exhaust each start for about 1 minute. Also has check valves on the exh manifolds that always internally fall apart and the L hoses (dealer only) burn thru. Look there. Then if a rattle/humming sound open the hood and look at the PCV on drivers side behind the air intake on the valve cover and feel the hose and see if its vibrating - due to throttle cable mount broken, clogged PCV, or vac leak. Next if lifter tap then after oil pressure comes up it stops - change filter and oil and see if that stops it and check the coolant levels cause this often is the first signal that the lower intake gasket is leaking Dex cool into the top of the engine. Hope that helps.
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- #34 of 105
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Hear sound when I turn wheel on my 97 jimmy
by 97jimmy3
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Mar 20, 2007 (12:42 pm)
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- #35 of 105
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Hear sound when I turn wheel on my 97 jimmy
by 97jimmy3
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Mar 15, 2007 (9:59 am)
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Hello, I am new to this forum. I just purchased a 97 GMC JImmy SLT and when I back out of my driveway and turn the wheel to cut my back end in the direction I wanna go, or if I am just making a random turn on a street, I get a bang or thump under the truck?? Any Ideas??
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