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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 > Engine Tunes/Mods

Engine Tunes/Mods Performance Engine Tuning/Engine Modifications

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  #1  
Old 07-01-2018, 12:34 PM
clockmanbill clockmanbill is offline
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still overheating

When I got my 2005 tb, after a few trips it started overheating. It was fine till
I got on the highway and ran around 70. Than the gauge would go up about 3-4 marks over the center. I replaced the water pump, thermostat, coolant temp sensor, fan clutch and radiator. Now it goes up to 2-3 marks. When I slow down or stop it goes back down. I'm going to be pulling a camper this year , should I worry about it? Any help?
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  #2  
Old 07-01-2018, 12:43 PM
miketexas miketexas is offline
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2003 Chevy TrailBlazer LS
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Put a scan tool on it and see what the actual temp says.
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  #3  
Old 07-01-2018, 02:39 PM
clockmanbill clockmanbill is offline
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over heating

Ill try that. where should I take readings?
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  #4  
Old 07-01-2018, 06:18 PM
miketexas miketexas is offline
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2003 Chevy TrailBlazer LS
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Where you hook the tool up at the OBD port under the dash, driver side.

It looks similar to this:

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  #5  
Old 07-03-2018, 01:33 AM
Cctb Cctb is offline
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2006 Chevy TrailBlazer LS
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I had some issues with overheating. If it's leaking coolant, you may have a bad hose or hose clamp somewhere.

Sent from my SM-G950U using Tapatalk
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  #6  
Old 07-03-2018, 12:59 PM
clockmanbill clockmanbill is offline
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leak

not leaking coolant, put on a new lower hose when I put in new rad. The gauge does go back down , It's been over 100 here for the last 3 weeks. Could it just be to hot to keep the temp down?
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  #7  
Old 07-04-2018, 07:45 PM
thelcpl87 thelcpl87 is offline
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[QUOTE=clockmanbill;1590665]When I got my 2005 tb, after a few trips it started overheating. It was fine till
I got on the highway and ran around 70. Than the gauge would go up about 3-4 marks over the center. I replaced the water pump, thermostat, coolant temp sensor, fan clutch and radiator. Now it goes up to 2-3 marks. When I slow down or stop it goes back down. I'm going to be pulling a camper this year , should I worry about it? Any help?[/QUOTi had the same problem with my 08 envoy just installed a transmission oil cooler that helped drop the temp a couple of degrees
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Old 07-04-2018, 11:43 PM
regionvoices regionvoices is offline
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[QUOTE=thelcpl87;1590785]
Quote:
Originally Posted by clockmanbill View Post
When I got my 2005 tb, after a few trips it started overheating. It was fine till
I got on the highway and ran around 70. Than the gauge would go up about 3-4 marks over the center. I replaced the water pump, thermostat, coolant temp sensor, fan clutch and radiator. Now it goes up to 2-3 marks. When I slow down or stop it goes back down. I'm going to be pulling a camper this year , should I worry about it? Any help?[/QUOTi had the same problem with my 08 envoy just installed a transmission oil cooler that helped drop the temp a couple of degrees
The gauge has a stepper type motor that are notorious for being inaccurate. Perhaps you should try a laser hand held temperature gauge and see if the temperatures match or are close to the same. My guess is the stepper motor on the gauge is faulty
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  #9  
Old 07-05-2018, 12:31 PM
Atoy Atoy is offline
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2004 Chevy TrailBlazer LS
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Electronic cooling fan clutch

These vehicles have the terrible electronic fan clutch that apparently was so troublesome that GM abandoned it and went back to a mechanical fan in 2008.

My 2004 TB will not pull a small camper in weather above 80 degrees without overheating and I tried almost everything, including a overhaul of the entire cooling system and exhaust. The only fix that finally worked was a Fan override that requires bypassing the computer to force the fan to run full speed.
Someone said they put a 2008 mechanical clutch on the 04 and it worked. I have not tried that one.
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  #10  
Old 10-25-2018, 04:02 AM
denisbill denisbill is offline
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I got on the highway and ran around 70. Than the gauge would go up about 3-4 marks over the center. I replaced the water pump, thermostat, coolant temp sensor, fan clutch and radiator. Now it goes up to 2-3 marks. When I slow down or stop it goes back down. I'm going to be pulling a camper this year , should I worry about it? Any help?
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