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Chevy Blazer GMC Jimmy Maintenance and Repair

3311 messages,  Last post on Nov 19, 2008 at 8:53 PM

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#863 of 3311 2000 Blazer - Vibrations at Highway speeds- Normal!? by donsmy Nov 18, 2003 (8:59 am)
I have a 2000 Blazer LT 4WD with 44K miles on it. I recently started experiencing vibrations at highway speeds. My dealer verified the problem. According to a GM document, there is no fix to this problem. According to GM Document ID# 1381844. The document is entitled "Vibration at Highway Speeds - Suspension Wheel #PI01273B - (09/15/2003). The document explains the problem & Symptons exactly as described in many of these discussions. There is a line in this document that reads: "This vibration is considered a normal characteristic for these vehicles and no repair attempts should be made." This document covers 2 & 4WD drive GM vehicles with the same body types (i.e. blazers, Jimmy, Bravada, S-10, Envoy) and covers years 00 - 03. This is absolutely ridiculous!! If this was "normal" why didn't the vehicle do this when it was new? I called Chevy's customer service line and they verified the document. They told me to take it to another dealer for a second opinion After that I guess I'm out of luck. My dealer found the document at the following URL: http://service.gm.com/servlets/BlobShtml?ShtmlFile=1381844.   Has anyone had better luck from GM in getting this problem fixed?
#864 of 3311 98 Blazer NO HEAT by kpann Dec 01, 2003 (11:00 am)
My Blazer has been running about 20 degrees cooler than normal and now that the mornings are in the 30's I have no heat so I put in a new thermostat. It is now running back at normal (200 degrees) but still no heat. I looked for a valve in the heater lines but didn't see one. Any suggestions. Looking to try cheap fix first before I go the dealer.
#865 of 3311 No heat by cage47 Dec 01, 2003 (4:30 pm)
...sounds like your heater core is clogged and you're going to need it flushed. That Dex-cool crap will clog your core if it jells up. SO you know, you can put in the green coolant and it won't cause any problems. I've done it and it's fine. Going on 5 months. Replies to this message: asare200 (Nov 08, 2004 10:34 pm) cage47 (Jan 16, 2005 7:14 am)
#866 of 3311 No Heat by kpann Dec 02, 2003 (3:59 am)
Thanks cage47, for the heck of it I flushed the Heater Core last night and this morning I had heat. I tried to get the bottom radiator hose off to flush the entire coolant system but couldn't get the hose off. What is the best way to flush the system, does the thermostat need to come out first?
#867 of 3311 cage47 antifreeze by broph Dec 02, 2003 (1:33 pm)
I was thinking about flushing out the jello & replacing it with the green stuff. Did you do it yourself or did you have it done. I curious as to how much it will cost to do the change. I just had the waterpump replaced in my '99 w/ 51K on the odo. I feel that that was a little premature. Thanks for any input.
#868 of 3311 Gave it up--99 Jimmy by richinraleigh Dec 03, 2003 (5:45 am)
Finally had enough. 76,000 miles and in my opinion, could not be trusted as a day to day vehicle. Cooling system failures(transmission coolant lines, heater core) a pending $750.00 bill to replace the intake manifold gasket, door bushings needed to be replaced...etc etc plus the inadequacy of my local dealer to fix anything right. Too bad, was a good truck but it will definately nickel and dime you to death. Shouldn't be having the problems it is considering the milage and care it has had.   On the positive side....I love my new 4runner!!!
#869 of 3311 Change antifreeze by cage47 Dec 03, 2003 (3:12 pm)
I did it myself. I picked up one of those backflush kits from Autozone, one that you install an adapter in the coolant supply line to the heater core. SUre enough a week after I changed the fluid I found that my water pump was bad also. I had green fluid trickling out of the little pee valve hole. Turns out the old Dex cool had jelled enough it had worn out my water pump but it was gelled enough that it didn't leak. And a week of the green stuff flowing through it cleared it out enough for the fluid to start leaking. Fortunately it was the easiest water pump I've ever replaced. No I didn't take out the thermostat. There are directions on the kit. It cost me $5 for the kit and $7 for the antifreeze/coolant (twice after replacing the pump). Oh and my 98 has 72k miles on it. YMMV But you'll probably want to replace it again in six months since you probably won't get all of the old Dex cool out. When I replaced the water pump, after one week it went from bright green to a definite brownish tinge. Not bad but you could tell it wasn't totally clear. I checked it last month and it's still bright green. And Heat is good and warm.
#870 of 3311 Change antifreeze by broph Dec 06, 2003 (12:17 pm)
cage47: Thanks for the info, I'll have to give it considerable consideration.
#871 of 3311 98 Blazer by rogerm4 Dec 07, 2003 (6:40 am)
Every few months, my 98 Blazer will just refuse to start. Acts like it wants to start, just wont turn over. If I let it go for 15 minutes and try again, it starts right up. Happened 6 times in last year or so. Dealer replaced egr valve, still happens. Now dealer "thinks" it may be ignition switch being locked out by the security system. Any similar problems or ideas? Thanks
#872 of 3311 Switching Coolant by cliffwilson Dec 09, 2003 (7:19 pm)
Before switching from DexCool (orange coolant) to standard (green) coolant, be sure your Blazer is no longer under any factory warranty. GM considers it a breach of warranty to replace DexCool with standard coolant. Since DexCool is subject to coagulation well before 5 years, I understand the reservations expressed. Personally, I drain and refill my system with fresh DexCool each year. I also recommend using distilled water when cutting your DexCool or standard coolant to its 50/50 ratio. Even though GM's service manual permits the use of good quality tap water, the limited additional expense for the distilled water is worthwhile insurance. Since the 4.3 liter is all iron (block and heads), I perfer playing it safe.

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