Why you don't buy cheap parts - 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 5.3L V8 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 12-25-2017, 06:23 PM
jimbo7 jimbo7 is offline
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2004 Chevy TrailBlazer LS
Midnight Blue Metallic 4.2L I6 4X4
Join Date: Oct 2015
Location: st. louis
Posts: 71
Why you don't buy cheap parts

The past few weeks my I6 hasn't been reaching normal operating temp like it should. Of course this happens when it starts to get cold out. I've gathered all the parts and decided to get it done this weekend before it gets any colder. Everything came from NAPA (fan clutch, water pump, thermostat, coolant, and hoses). I got lucky and borrowed the pneumatic tool to remove the fan clutch from a friend. All went pretty well, but I had to fight fan shroud/clutch assembly in and out. I filled it back up with coolant a little differently than in the past. After installing the lower hose, I only connected the upper to the engine and then filled it up through the hose. After it was full I did the radiator. This seemed to get most of the air out as I only had to top off a solo cup's worth (I alternate back and forth with coolant and water then just throw it away). Now it warms up so much faster it's scary. Plus it's way quieter with the new fan clutch.

So it turned out my problem was this:


The bottom is the crappy Oreilyzone part and the top is the Napa/ACDelco part. Notice the difference? The rubber seal came off and jammed up the thermostat.

Don't buy crap.
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  #2  
Old 12-25-2017, 06:54 PM
Dr_Fiero Dr_Fiero is offline
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2005 Chevy TrailBlazer LT
Cranberry Red Metallic 4.2L I6 4X4
Join Date: Dec 2017
Location: Southern Alberta, Canada
Posts: 27
I've seen similar problems with other 'cheap' thermostats.

The Fiero has a T-stat that that has a larger metal arch. The good ones, the arch is stamped, and has ribs in it for rigidity. There are cheapies though, where the metal of the arch is flat! As soon as you get pressure under it a few times, the arch collapses, and you get a similar effect as this.

At least on the Fiero it's a roughly 45 second job when the engine is cool.
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  #3  
Old 12-26-2017, 10:59 PM
jimbo7 jimbo7 is offline
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2004 Chevy TrailBlazer LS
Midnight Blue Metallic 4.2L I6 4X4
Join Date: Oct 2015
Location: st. louis
Posts: 71
Forgot to add that the cheap t-stat was 1.5yrs old
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