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2007 chevy trailblazer_ls
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Discussion Starter · #1 ·
Here is how I installed a C6 Corvette efan on my I6 Trailblazer. I hope these come out large enough to read.

Mark
 

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2003 gmc envoy_slt_xl
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Hi,
It's an interesting subject. I wish I could do it here. The outside temperature here (I work in Saudi Arabia) is around 40 - 49 C. Do you think it will do here. Are the tools you mention cheap to buy?
BTW, nice pics and elaboration.
 

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2003 gmc envoy_slt_xl
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What happens if...

Hi again,
I searched the market and found a regular fan clutch (not electrical) that fits on the Envoy water pump. Its fan inner diameter is a little smaller than the Envoy's. I can fix that in a workshop making an adapter to use the original Envoy fan on the regular clutch. My questions are as follow:

1- What codes will I have after completely disconnecting the electrical clutch?
2- How can I disable them?
3- If I don't disable them and decided to live with the CE light, will the PCM decide to put the engine on Reduced Engine Power?
If you're interested, the clutch is any Ford model 1995 or 1996. It has the same big nut and distance to the Rad.
I appreciate your quick response.
 

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2006 chevy trailblazer_lt
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Hi again,
I searched the market and found a regular fan clutch (not electrical) that fits on the Envoy water pump. Its fan inner diameter is a little smaller than the Envoy's. I can fix that in a workshop making an adapter to use the original Envoy fan on the regular clutch. My questions are as follow:

1- What codes will I have after completely disconnecting the electrical clutch?
2- How can I disable them?
3- If I don't disable them and decided to live with the CE light, will the PCM decide to put the engine on Reduced Engine Power?
If you're interested, the clutch is any Ford model 1995 or 1996. It has the same big nut and distance to the Rad.
I appreciate your quick response.
You might, have many codes from the computer as though you took something off that isn't supposed to be there, and if you don't put anything on there you will overheat in a second and just destroy the whole engine. The computer may decide to go into reduced power mode, especially if the fan is not doing its job right, and you set off more codes. You cannot "disable" the codes, as that is part of the computer's job to let you know when something is not working right, so you can turn them off using an OBDII code reader, but they will come back on. Good luck, let us know!
 

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2007 chevy trailblazer_ls
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Discussion Starter · #7 ·
You cannot "disable" the codes, as that is part of the computer's job to let you know when something is not working right, so you can turn them off using an OBDII code reader, but they will come back on. Good luck, let us know!
What? I turned off the codes using Hptuners. Do it all the time with the race cars we tune. A code reader will just clear the code and the cel will come back on if the parameters for setting the code return.

Mark
 

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What? I turned off the codes using Hptuners. Do it all the time with the race cars we tune. A code reader will just clear the code and the cel will come back on if the parameters for setting the code return.

Mark
Easier said than done on 02-05 I6s, the 06+s are easy but Im not sure HPT can do the 02-05s. Dont quote me on it though. I know for a fact EFILive can kill all efan related codes.

Honestly I see no reason or benefit to swap over to a purely mechanical fan clutch, but if you want to get one off an 08-09 I6 because they're not controlled by the ECM.
 

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2003 gmc envoy_slt_xl
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Honestly I see no reason or benefit to swap over to a purely mechanical fan clutch, but if you want to get one off an 08-09 I6 because they're not controlled by the ECM.
I live in a terribly hot city. Temperature sometimes reaches 50+ celsius. The electrical clutch engages a little bit and then releases the fan while the engine is boiling. In addition, I noticed that when the gauge indicates 220+, the ECM doesn't send any orders to the clutch to engage, as if the truck is running very normal. The mechanical clutch behaves according to the heat it senses. I assume it's going to run more efficiently than the original one. Some improvements in the car industry aren't necessary, they are only to pull more money out of your pocket.

How can I get that HPtuner? Can a Tech2 do it?
Thanks a lot for the replies.
 

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Discussion Starter · #10 ·
Tech 2 will only clear the code(s), not prevent the cel from turning back on. For example, if you unplug a sensor and the ecm sees it, it will turn on the cel and store a fault code. The Tech 2 is able to turn off the light, but when the parameters are met to turn the light back on because the sensor is unpluugged, the cel will come back on. My understanding is, using a program like HPtuners and turning off the code, the ecm ignores the fact the sensor is unplugged, therefore not turning on the cel.

You can go to www.hptuners.com for more information and see if their program will work on your year truck. My suggestion is after confirming hptuners will work on your truck, find someone that already has hptuners AND tuning experience, buy the credits for your vin ($100 or so) and have them turn off the codes. However, if you have the time and desire, buy the hptuners program and learn about how to tune cars. That would a steep learnin curve if you're not experienced in tuning. I guess to get the most bang-for-your-buck from doing your own tuning, you would need access to a dyno. I found it easier to spend the $100 and have my tuner do it for me.

Maybe pcm4less can sell you a tune with the codes already turned off.
 

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2002 chevy trailblazer_lt_ext
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Great How-To. Thanks. Do you, or anyone know the CFM the C6 fan pushes? I read on a corvette forum it's under or around 2000 cfm. If that's true then why not use a taurus fan or even a lincoln mark viii fan. I've read that tons of people, especially offroaders use the lincoln mark viii efan. They are supposed to push 4500 CFM. I've found some on ebay for about $60, I'm going to try the local junk yard and see if they have any. I'm replacing my radiator so I thought now would be a good time to do a efan conversion as well. Once I get it done I'll post some info. Thanks again for the great how to.
 

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2005 gmc envoy_slt_xl
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So what is the total cost minus removing the codes? thanks
 

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2005 chevy trailblazer_lt
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Am so sorry does anyoner tell me the parts number I need to do a efan on tb 02. I found some fan timer or saometing on advance auto parts what do esactly do I need thanks ?
 

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2004 chevy trailblazer_lt
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Great How-To. Thanks. Do you, or anyone know the CFM the C6 fan pushes? I read on a corvette forum it's under or around 2000 cfm. If that's true then why not use a taurus fan or even a lincoln mark viii fan. I've read that tons of people, especially offroaders use the lincoln mark viii efan. They are supposed to push 4500 CFM. I've found some on ebay for about $60, I'm going to try the local junk yard and see if they have any. I'm replacing my radiator so I thought now would be a good time to do a efan conversion as well. Once I get it done I'll post some info. Thanks again for the great how to.
RimoniManu.....
Just wanted to know if you found out why no one uses the taurus or lincoln mark fans on the trailblazer .or if you finally put one on your self? My neighbor has a ford junk yard an has some .if you got one to work . would love some info.....thanks
 

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Hey lint...
Yes I finally put my lincon mark viii fan in and it's AMAZING. I used the stock fan cowling and trimmed it so I could mount the mark viii on it, that way it will fit the edges of the radiator perfectly and pull air through the entire face of the radiator. I used a fan controller from DC Control the model is 2sp. It's just for the 2 speed ford/lincoln fans and it works great. The controller comes with all necessary parts. You can wire it to the AC compressor to turn on when your AC is on. It can also be wired to stay on for a little while after the engine is shut off. My theory for using a corvette fan is people think that if the efan can keep a high performance engine cool then it will be the best for any engine. Infact some members here have said that's why they go with the corvette fan. But after researching offroad site's, corvette forums, and other high performance sites; they all mention the lincoln mark viii fan as being the best. I can't compare it to a corvette fan because I don't have one, so I can't say if it's better or not, however; This fan pushes huge amounts of air. When I say huge, I mean HUGE. It's hard to describe, but I'm amazed with it and am glad I used a lincoln mark viii fan.
 

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Discussion Starter · #16 ·
One thing you are overlooking by using a fan shroud that covers the complete radiator- all the air must now attempt to go throught the radiator limited by both the fan and the shroud. By using something like the C6 fan, there is a lot of open space to allow the air to pass through the radiator. The purpose of the fan is to keep both the coolant temperature and a/c temps acceptable during idling, stop and go driving, and low speed, high load conditions. After the vehicle is above 40 mph, the fan is not doing much, if anything, to control coolant temps.
FWIW, I proved this on one of our C6 racecars that the 2006 and newer fan cools better than the 2005 fan. The 2005 has a closed shroud whereas the 2006 and up ais opened to allow air to pass through the radiator more easily. The car manufactures must build their vehicles to work in all conditions, whereas we can choose to use whatever components meet our specfifc needs.
 

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This is what my fan looks like


So you're saying that because the shroud covers the entire face of the radiator it does not allow air to move "freely".... If that's true then why does the stock shroud cover the entire face of the radiator? I understand at high speeds the fan will restrict the air flow through the radiator if all the air has to go through the fan, however; my tb can't go anywhere near as fast as a C6 racecar. My tb is also more for around town stuff and eventually offroading. That is something I can try though, to see how an "open" shroud compares with my "closed" shroud. As soon I rebuild my tranny I'll work on it. Thanks
 

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Discussion Starter · #18 ·
This is what my fan looks like
So you're saying that because the shroud covers the entire face of the radiator it does not allow air to move "freely".... If that's true then why does the stock shroud cover the entire face of the radiator?
For stop and go traffic and to keep the a/c blowing cool air during those s & g conditions.

If you find that your set up works to your satisfaction, great! I enjoy reading how some one, like you, did it differently. Your train of thought and execution of doing it, along with my way, may have someone else build upon our installs, come up with even a better way. That makes another proven alternative to what I did. I used the C6 fan because of my relationship I have with some GM engineers for techincal help.

I've experienced neither high coolant temps during s & g driving (above 190*f by my Stweart Warner temp gauge) or any rise in a/c duct outlet temps ( the DCControl fan controller turns on the fan any time the a/c compresser is engaged). If I should encounter any adverse s & g coolant temps, the fan controller gives me the option of having the fan on any time my Tb is running.

Keep us updated on what you experience when you get it up and running.
 

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2008 chevy trailblazer_ss_3ss
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Guys,
I'm often on another site, but I thought I would share what I did, as it's sort of in line with yours.

First off, I have a DC Controls unit in the box, and have had it for over three years. It's supposed to go on my Taurus fan and into my '65 GTO, if I ever get around to it.

Not wanting to steal from that car, I really wanted an efan on my TBSS, and I like the variable speed option.

So, after a long while, I got a C6 setup, but I wasn't that impressed with the fan itself.

I am currently running a large, powerful, single 18" fan that is being controlled by the C6 fan module wired into my ECM, and programmed through HPTuners.

I've had in for about five weeks, and it's working great, but I must admit that it just hasn't been very hot here...to say the least. It's the coolest year I can remember, and I have a fantastic memory, and I've been here about as long as my Goat.

Anyways, my plan is to upgrade the wiring in the terminals as I want to go with 12 gauge wiring, and take it from there.
 

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2003 chevy trailblazer_ltz
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My corvette e-fan is on its way to my house. Cost me $205 shipped from eBay. New, OEM too. The Delta Current Control controller is on its way too, $155 shipped. This should be fun!

07TB, how many miles have you put on your truck since you have had it installed? Is it working as well now as the day you put it in? Great thread! :thumbsup:

Any other thoughts?
 
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