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Chevrolet Blazer Engine and Performance Problems

142 messages,  Last post on Nov 11, 2009 at 9:09 PM

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#31 of 142 2001 blazer over heating problems by sbalsano Jun 11, 2007 (3:13 pm)
Back in march the dealer repaired coolant leak from intake,replacing lower manifold and gasket. they also performed complete cooling system flush, 10 days later had to have it towed back because it started to blow hot from the a/c and temp gauge reading over heat.the dealer said i blew upper rad. hose,they replaced that. 6 weeks later same problem, this time i let it rest about 4 hours checked for leaks, it cooled and drove fine. i took it to another gm dealer, they could not find a thing wrong, they did pressure tests found no leaks, changed the thermostat just in case. now 10 days later same problem, i never had this before the first dealer visit. any ideas? Replies to this message: tidester (Jun 11, 2007 5:42 pm) repairdog (Jun 12, 2007 2:31 am)
#32 of 142 Re: 2001 blazer over heating problems [sbalsano] by tidester HOST Jun 11, 2007 (5:42 pm)
Replying to: sbalsano (Jun 11, 2007 3:13 pm) It doesn't sound like quite the same problem but you may want to check this out: No Heat And Overheating   tidester, host SUVs and Smart Shopper
#33 of 142 Re: 2001 blazer over heating problems [sbalsano] by repairdog Jun 12, 2007 (2:31 am)
Replying to: sbalsano (Jun 11, 2007 3:13 pm) You said a new thermostat but did you get a new radiator cap - the GM ones can clog and not work and the advised fix is buy a Stant one - when these clog expanding coolant cannot go into the overflow tank and then when cools be sucked back to rad or do not hold the 16lbs pressure so coolant boils at lower temp. 50% mix in coolant. Then also possible the radiator has many of the small tubes clogged that run thru it as the flush sometimes pulls the crap out of the heater core and block and it can then clog the radiator. Next would be water pump but said no leaks. Then fan clutch going. Is AC compressor good and not a big rpm drop or drag. The final thing that could cause is a leaking heat gasket if you got the engine really hot before the intake job and they can be pinhole size that reseal and only blow open at higher temps (with AC on) and dealer can pull plugs and look and run a compression test if it comes to that but these motors don't normally do this.   For all - 3/36 or 3/50 on coolant change do not believe the Dex Cool 5/100 crap. At same time always a new thermostat and Stant cap.
#35 of 142 95 Chevy Blazer HELP! by cathys0715 Aug 04, 2007 (11:41 am)
Hi all, my Blazer has really got my husband and I stumped. Wasn't driving well (very sluggish) and he changed one of the O2 sensors. Then, it overheated so first he changed the thermostat. Not long until it overheated again and he changed the fan clutch. It was running very nicely for a few days! Now it is not overheating but is continueing to run very poorly and will still smell hot? It is very sluggish, has a loud roaring noise, almost like an airplane taking off, and misses some when driving...or maybe hesitates is a better way to describe it. Occasionaly there is white smoke out the back, which I have mostly noticed after driving on the highway vs. in-town. Occasionaly the check engine light comes on, primarily when it is hesitating and having to "work". Any and all help would be greatly appreciated! Replies to this message: tidester (Aug 04, 2007 12:15 pm) cathys0715 (Aug 04, 2007 12:43 pm) tidester (Aug 04, 2007 12:46 pm)
#36 of 142 Re: 95 Chevy Blazer HELP! [cathys0715] by tidester HOST Aug 04, 2007 (12:15 pm)
Replying to: cathys0715 (Aug 04, 2007 11:41 am) The "white smoke" means that water or antifreeze is getting into your cylinders. You may have damaged your head gasket when the engine overheated.   tidester, host SUVs and Smart Shopper Replies to this message: cathys0715 (Aug 04, 2007 12:43 pm) tidester (Aug 04, 2007 12:46 pm)
#37 of 142 Re: 95 Chevy Blazer HELP! [tidester] by cathys0715 Aug 04, 2007 (12:43 pm)
Replying to: tidester (Aug 04, 2007 12:15 pm) Thanks for the reply! 2 things: the white smoke was happening before all the changes, too. It's rather infrequent, also. Could a bad head gasket be the cause of the other problems, too? And I just thought of this when reading the response up there to someone else's problem: my a/c compressor doesn't kick on about half the time. I have to open the hood and "jiggle" the little cable thing that is attached to the compressor and then it kicks on and I have cold air. Could this be related to the other problems? Replies to this message: tidester (Aug 04, 2007 12:46 pm)
#38 of 142 Re: 95 Chevy Blazer HELP! [cathys0715] by tidester HOST Aug 04, 2007 (12:46 pm)
Replying to: cathys0715 (Aug 04, 2007 12:43 pm) The answers to your questions is "possibly" but I will leave it to the experts to jump in and advise. Anyone?   tidester, host SUVs and Smart Shopper
#39 of 142 Mass Air flow Sensor by grose67 Jul 31, 2007 (9:04 am)
#40 of 142 Mass Air flow Sensor by grose67 Jul 25, 2007 (6:04 am)
I have a 95 Blazer withe the 4.3 Vortec Vin number "W". The fuel injection system is commonly reffered to as a spider.I don't know the proper term for it.Does this set up use a Mass Airflow Sensor? Where is it located? If it doesn't, what does it use and where is it located? Replies to this message: tidester (Jul 25, 2007 12:07 pm) grose67 (Jul 31, 2007 9:04 am)

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