Last post on Jul 16, 2013 at 4:58 PM
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#2015 of 3676 1999 Blazer Front End Pulse
Mar 19, 2006 (9:03 pm)
I have a pulsing/clunking noise when braking coming from my front right wheel on my 1999 Chevy Blazer 2-door 4wd V6. Normally I would assume that a pulsing means a "warped" rotor, however, I replaced the front two rotors and pads with no change. Then I thought that the guide pins/bushings might be allowing the caliper too much play to "jiggle around" so I replaced the bushings, no change. Then I noticed that the caliper was very rusted, but after changing the right front caliper, surprise, no change. I even tried removing the ABS fuse to no avail. I had the rotor checked to see if it was "true" and it is. The rotor I replaced on the front right side had a lot of glazing and pits on the inner side. Also, the tire has a good deal of wear on the inner tread but not on the outer. After an exhaustive search on the net and this thread, I think it might be either the control arm bushings or the wheel bearing or hub. This only happens when braking. When I go to step on the brake at around 35+mph, it pulses violently and quickly, and as it slows down, a clunking noise gets louder as the pulses get slower. Any suggestions?
#2016 of 3676 Re: Not working 4WD on Blazer S10 1998 [repairdog]
Mar 19, 2006 (11:37 pm)
Hi, Iīve checked switches and sensors, they seems to be ok, and have power. Iīve checked the vacuum actuator, and it seems ok, pulls the wire real strong. Iīve raised the car and, but still no rotation on the front wheels. Since the the vacuum actuator works and pull the wire, should the problem be in the front differential?? I donīt have an exploded view over the front differential. How do the wire activate the differential? Is it possible to fix at home? Is it fixable without taking it away from the car? Could I download an exploded view over the front differential from somewhere? Etc? Have a nice day.
#2017 of 3676 Re: 1999 blazer electronic temp control [pete6266]
Mar 20, 2006 (3:05 am)
Did you flush the heater core? Most Blazers lose this at some point and GM knows that the Blazer line is the most prone to Dex Cool core clogs due to air getting in the cooling system. So, to flush, my method (opinion, not GMs) is to remove the ends of the heater hoses at the engine side (follow the 5/8 and 3/4 hoses from the firewall) and unclamp them, then using a garden hose simple hold the hose end on one hose and let the water run out the other. (don't get the dist all wet so cover with a plastic trash bag if you make a mess like me) Why this way - a chemical flush always takes the core out within a short time (pin hole leaks start) and you will smell the Dex cool in the air vents - not very good for you and Dealer charges about $600 to replace - dash has to come out. This limits the water pressure too so you don't blow the core yourself.
Hope you did a good flush before the new WP, cleaned the reservior out, and changed to an after market cap. Keep the reservior at the Hot level when the Blazer is Cold to ensure no air in the system - and speaking of air - is the temp OK now cause air in the system causes temp swings so watch that - may have to bleed the system.
Next, is this a Climate Conrol Blazer (temps on center dial) cause the electronic blend motors fail and the control head can too big $$ so search earlier posts.
Another thing is rent (free) at an auto store a cooling system pressure tester and pump the system up and see if it does not leak - another possible area.
Let us know what else you need or the fix for others.
#2018 of 3676 Re: 1999 Blazer Front End Pulse [zippo99]
Mar 20, 2006 (3:16 am)
Did you check all 4 discs? Rears can sound/feel like fronts. Rears need turning with the fronts and the single piston calipers are junk so get rebuilts on a brake job. To check the hub jack the Blazer up and support under the lower a-arm so the CV axle can freely turn - you will feel and hear the grating if its bad - really bad can clunk but did you do the lower ball joints yet - #1 Blazer clunk area and you can't usually feel any movement with the front jacked up. Most alignment shops can test these and then alignmnet should help the wear - run at 35 psi and rotate regularly on Blazers. The idler arm can allow wear on Blazers too - frame to tie rod arm and you can see/feel movement with a side to side tire hand wiggle (all have alittle I mean see/feel the arm flex up) -again the shop.
#2019 of 3676 Re: Not working 4WD on Blazer S10 1998 [impalacab]
Mar 20, 2006 (3:23 am)
Yes, there are diagrams on some online parts stores but I am not allowed to give you the links per this sites rules. After looking at the first post, what makes you think the 4wd was not working - will the selector on the dash engage and the light go solid on 4Hi and then 4Lo? Means alot to resolve. On that front axle coupler the cable pulls a gear to connect that passenger side right axle - seen posts of the gear sheared/worn bit again more indications?
#2020 of 3676 Where are oxygen sensors located on '01 Blazers?
Mar 20, 2006 (6:30 am)
Can anyone tell me where all (3) O2 sensors are located on my 2001 blazer? I know where 1 on the air intake is located but I have no clue about the rest of them. Also, does anyone have any ideas on what could be causing vibrations at about 65 mph? I dont think it is suspension or tires, etc. Are CV joints a possibility? What about all this talk about ball joints going bad on Blazers? Well, I am very new to this posting of questions, but I will thank all of you in advance for any responses I get.
#2021 of 3676 Re: Where are oxygen sensors located on '01 Blazers? [taiu476]
Mar 20, 2006 (6:48 am)
That one on the air intake is an air temp sensor, not O2, and the other is the MAF. Look on the exhaust for all the O2 sensors - see them 3" long screwed into it. 1 on each side right below the exhaust manifolds and the other behind the cat converter. The SES light will come on if they go bad normally, so has mileage dropped or what? As to ball joints and vibrations, search the forum for many recent posts on them, in fact scroll up a few pages and many are there.
#2022 of 3676 Re: Not working 4WD on Blazer S10 1998 [repairdog]
Mar 20, 2006 (7:28 am)
The selector on the dash turns to solid light on both 4Hi and 4Lo. When I have the car raised and engine running and put in gear in 2Hi, the rear drive shaft rotate and the rear wheels turning. When I put in a gear in 4Hi or 4Lo, the front and rear drive shaft rotates, but only the rear wheels spin... There are no visable damage anywhere on the front differential, axle, tubes and so. The vacuum activator pulls the wire, and I can pull the wire by hand when I disconnect it from the activator (but itīs hard to move).
#2024 of 3676 Thanks repairdog
Mar 20, 2006 (7:39 am)
Thanks repairdog, for the info. Yes the service engine light has come on and I have lost a lot of gas mileage. Could O2 sensors be responsible for running slightly rough too? Is there any way of testing o2 sensors or do you just go ahead and replace em any way? I have almost 90,000 miles on Blazer so is it a good idea to go ahead and replace em? Also, I am planning a tunep. planning on new spark plugs, New K and N filter element (Old one hopelessly dirty), and replace o2 sensors. Is there anything else anyone can think of that would be a good idea to check into? Thanks repairdog and all else who reply.