Engine coolant change - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain

02-09 Vortec 4.2L I-6 Engine and Drivetrain Q&A forum for engine and drivetrain repairs/modifications/tuning.

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  #1  
Old 06-08-2007, 09:27 PM
DaveH DaveH is offline
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2002 Chevy TrailBlazer LT
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Engine coolant change

At what miles or time interval do most of you change your engine coolant. Owners manual says it is good for 150,000 miles. That seems an awful long time. My TB has 72,000 miles and was six years old on May 26, 2007. Should I change it? Any thoughts?

Dave
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  #2  
Old 06-08-2007, 09:35 PM
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MAY03LT MAY03LT is offline
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I would do it because of the age. Ill be doing mine next year (will be 5 yrs old) and I shouldn't have more then 50K on it by then.my


150K does sound reaaaaaaly long
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  #3  
Old 06-09-2007, 12:45 AM
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ehall0527 ehall0527 is offline
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I'd say change it now. Better safe than sorry. It's pretty easy to do yourself and the materials don't cost too much. It's really easy since the 2002's have a drain cock in the bottom of the radiator.
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  #4  
Old 06-09-2007, 01:53 AM
ScarabEpic22 ScarabEpic22 is offline
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My 02 was built 11/3/01, so it is time for a coolant change now, but I plan on doing it when I get back from my trip this coming week (Orlando and then to the Bahamas ) along with a set of brakes.
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  #5  
Old 06-09-2007, 02:28 PM
ssilicon ssilicon is offline
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Quote:
Originally Posted by DaveH View Post
At what miles or time interval do most of you change your engine coolant. Owners manual says it is good for 150,000 miles. That seems an awful long time. My TB has 72,000 miles and was six years old on May 26, 2007. Should I change it? Any thoughts?
Assuming a properly maintained Dexcool system... I would change it at least every 5 years. If you go higher than the 150 miles do it sooner (not likely). The chemistry starts to change in the fluid and not for the better. So freshening it up after 5 years is important.

As far as "properly maintained", do not let air get into the system any more than you can help. Regularily check the coolant color consistency etc. Keep it leak free and good hoses and pressure cap etc.
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  #6  
Old 06-11-2007, 09:04 PM
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Sparty Sparty is offline
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I changed mine after five years with just under 50K, it doesn't cost that much, better save than sorry.

Buy about five gallons of distilled water,
1. drain radiator,
2. top off with distilled water
3. warm up engine
4. let engine cool
start over at step one until radiator drains clear.

Buy two gallons of FULL strenght anti-freeze, drain water from radiator and refill with anti-freeze. Warm up engine, let cool and check for 50/50 strenght. If strenght is too low drain radiator some and add more full strenght A.F.
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  #7  
Old 06-11-2007, 09:09 PM
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ehall0527 ehall0527 is offline
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Originally Posted by Sparty View Post
Buy two gallons of FULL strenght anti-freeze
Anti-freeze?? Dex-cool is what the Trailvoy's use and the two cannot be mixed. I don't think I would recommend the change. Just my
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  #8  
Old 06-12-2007, 09:25 PM
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Sparty Sparty is offline
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Originally Posted by ehall0527 View Post
Anti-freeze?? Dex-cool is what the Trailvoy's use and the two cannot be mixed. I don't think I would recommend the change. Just my
Anti-freeze can be any type.....

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  #9  
Old 06-12-2007, 09:42 PM
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ehall0527 ehall0527 is offline
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Thanks for the clarification
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  #10  
Old 06-12-2007, 10:38 PM
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I would change it around 5 years or 100k. It wouldn't hurt to replace the serpetine belt, water pump, thermostat and hoses then also.
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