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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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#133 of 142 Thermostat housing by duntov May 29, 2009 (3:37 am)
It is likely the water pump leaking. The water pump has a hole in the casting under the impeller shaft which will leak if a water pump bearing seal fails. That indicates that the wtaer pump needs to be replaced.   Another more common source of a leak is the thermostat housing to intake manifold gasket. Sometimes they leak a little after they have been replaced until the gasket swells and seals. Especially if the gasket was installed wihout any Permatex High Tack sealer or it was tightened incorrectly or not tightened enough. Many car owners or shop technicians will not tighten those enough after the thermostat has been replaced and the two thermostat housing bolts will need to be snugged up a little to stop a coolant leak. The aluminum thermostat housings are easy to break if they are overtightened. I wish shop technicians were as cautious with oil pan drain plugs.   Other common sources of coolant leaks from the front ot the engine are:  1.) Upper radiator hose to thermostat housing connection.  2.) Lower radiator hose to water pump connection. 3.) Heater hose connections to the water pump and intake manifold. . Replies to this message: uniqorn2009 (May 29, 2009 12:57 pm) jlflemmons (May 29, 2009 9:21 pm) jlflemmons (May 29, 2009 9:19 pm)
#134 of 142 Re: Coolant Leak-2001 Chev Blazer [jlflemmons] by uniqorn2009 May 29, 2009 (12:54 pm)
Replying to: jlflemmons (May 28, 2009 7:37 pm) I'll try to see if it's the intake manifold. Autozone stopped checking codes for you Thanks for your help
#135 of 142 Re: Thermostat housing [duntov] by uniqorn2009 May 29, 2009 (12:57 pm)
Replying to: duntov (May 29, 2009 3:37 am) the motor is so tight I can't hardly see anything in there. I was thinking maybe it's the engines drain plug that has worked itself loose.   Thanks but it more than likely a intake manifold problem Replies to this message: jlflemmons (May 29, 2009 9:21 pm)
#136 of 142 Re: Thermostat housing [duntov] by jlflemmons May 29, 2009 (9:19 pm)
Replying to: duntov (May 29, 2009 3:37 am) 2001 4.3L engine does not use a thermostat housing gasket. The thermostat itself has a heavy rubber seal that compresses between the housing and the intake manifold and uses no sealer.   My bets are still on the water pump.
#137 of 142 Re: Thermostat housing [uniqorn2009] by jlflemmons May 29, 2009 (9:21 pm)
Replying to: uniqorn2009 (May 29, 2009 12:57 pm) You might try reaching around to the underside of the water pump and see if you get antifreeze on your hand. I would definitely check that before going after the intake manifold.
#138 of 142 2000 Blazer coolant by djo611 Aug 25, 2009 (10:20 am)
I have heard that you should only use dex-cool in the 4.3 engines, yet some mechanics suggest flushing the system and using a 50/50 mix of atifreeze because of gasket eating problems with dex-cool. Is this true?
#139 of 142 Dex-Crud by duntov Aug 25, 2009 (11:18 am)
There was a class action law suit pending against GM concernng people who used Dex-Cool anti-freeze which allegedly ruined their engines. Sadowski/Bertino vs General Motors Corp.   The class action suit has settled and the suit is closed. The claims were affected by the GM Chapter 11 bankruptcy. ( www.dexcoolsettlement.com )   Why risk using Dex-Cool when the green stuff is a tried and true antifreeze when used as instructed? Replies to this message: jlflemmons (Aug 25, 2009 11:27 am)
#140 of 142 Re: Dex-Crud [duntov] by jlflemmons Aug 25, 2009 (11:27 am)
Replying to: duntov (Aug 25, 2009 11:18 am) "Why risk using Dex-Cool when the green stuff is a tried and true antifreeze when as instructed?"   Because if you don't get every bit of that Dex-Cool out of the system, you will have problems. Like gasket issues and blocked cooling passages.   The big issue with Dex-Cool isn't so much the product, as the change interval that GM published. No way do you leave this stuff unchanged for 5 years 100K miles. I have not come across any issues with 60K changes. The 4.3L intake manifold gasket issue is not coolant related, but an issue with the proper torque of the intake manifold and it's flexing/distortion over time. Not all engines are affected (I have two such engines, one with over 90K and no issue) but some have failed in less than 60K miles, most around 70-80K.   I agree that the standard ethylene glycol antifreeze is good, and has been for years. As long as it is changed at least every 30K or 24 months, it will provide good service. What some folks don't realize is that the antifreeze properties are not the issue, it is the anti-corrosive chemical breakdown that causes problems. Nowhere was this more evident than in the mid-80's GM cast iron engines where the freeze plugs would rust out and start leaking. PITA to fix that "little problem". The parts would cost a couple of bucks, the labor hundreds!
#141 of 142 help by marblaze Nov 11, 2009 (2:07 pm)
how do i programm the remote for my 99 S-10 BLAZER Replies to this message: tidester (Nov 11, 2009 9:09 pm)
#142 of 142 Re: help [marblaze] by tidester HOST Nov 11, 2009 (9:09 pm)
Replying to: marblaze (Nov 11, 2009 2:07 pm) The Chevy Blazer GMC Jimmy Maintenance and Repair topic might be a better fit to your question.   tidester, host SUVs and Smart Shopper

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