Any one using this I6 Trailblazer Plug and Play Fan Kit from PCM OF NC?

snoozer

Active Member
I have been trying to decide if I want to go with this fan kit or just install a fan clutch for a 2008 into my 2003 Trailblazer. I am getting tired of dealing with the electric fan clutch, looking for alternative solutions to it.
I know either way I would have to get the PCM setup so I don't get any fan codes, but I noticed on a couple of the reviews on this electric fan kit mentions of upgrading the alternator to a higher output one.
Is this really necessary to go with a different alt, I don't have any extra stuff drawing from the electrical system?
Here's the link to the kit:
http://www.pcmofnc.com/product/i6-trailblazer-plug-and-play-fan-kit-3/

Thank you,
Mark
 

Mooseman

Moderator
Go with the thermo fan and tune. A lot cheaper than the e-fan setup and less troublesome. There have been some issues with them, including fan motor failure and there is no easy way to activate them with the A/C.

Trust me. I used to be on the e-fan Kool-Aid and went with the thermo clutch. Best decision I ever made.
 

Mektek

Well-Known Member
Go with the thermo fan and tune. A lot cheaper than the e-fan setup and less troublesome. There have been some issues with them, including fan motor failure and there is no easy way to activate them with the A/C.

Trust me. I used to be on the e-fan Kool-Aid and went with the thermo clutch. Best decision I ever made.
Sure there's an easy way. Connect fan power to the AC clutch connector and both will run together. I converted a Nissan pathfinder to dual electric fans that way and it worked well for many years. The relay running that circuit is rated for 30a - more than enough to power everything. You could also switch a separate relay from that source and power it independently if your fans draw a lot of power.

Just as a FYI I drove the TB 20 miles through moderate city traffic with no fan at all. The temp needle crept slowly upward at long stops, but nothing to be concerned about. If your cooling system is in good condition, electric fans will do fine.

I have a experiment I plan to conduct eventually - powering the fan from the fan clutch power and rigging up a hall effect sensor on the efan. That should make it work without setting codes. Just a theory for now.......
 
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HARDTRAILZ

Moderator
The real issue is the efan will not flow enough for the completely unbalanced cooling system in the 4.2. Forget the triggering of it and realize it will never move as much air as the system is designed to need.
 
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snoozer

snoozer

Active Member
Go with the thermo fan and tune. A lot cheaper than the e-fan setup and less troublesome. There have been some issues with them, including fan motor failure and there is no easy way to activate them with the A/C.

Trust me. I used to be on the e-fan Kool-Aid and went with the thermo clutch. Best decision I ever made.
Thank you very much. I most definitely don't need any more fan headaches.

When installing the thermo fan clutch in place of the electric one do I still use the same fan that's in my 2003?
The shop who installed the clutch has finally agreed to refund my money for the part & install whatever clutch I want if I bring it in.
So after clutch is replaced will it cause any issues driving it for awhile until the PCM can be tuned?

Once again thank you
 

Mooseman

Moderator
Sure there's an easy way. Connect fan power to the AC clutch connector and both will run together.
If you want to kill your alternator and wreak havoc with your voltages, sure. You have the clutch AND the fans cycling with the A/C. You don't want your fans cycling with the clutch.

When installing the thermo fan clutch in place of the electric one do I still use the same fan that's in my 2003?
Yes, exactly the same setup except you don't plug in the fan connector.

So after clutch is replaced will it cause any issues driving it for awhile until the PCM can be tuned?
You will get a CEL for the fan being disconnected, that's all. Everything will work and run as before. Only issue is that you won't know if another code comes up behind it so you should get the tune done ASAP or check the codes once in a while.

Again, I'd stick with a good name brand (not Dorman or parts store house brands) like Hayden for the clutch. For the tune, lime-swap.com (@limequat ) is good and cheap, $99 shipped. Might as well get other stuff done at the same time like shift firmness and a performance boost. He is very well versed with our platform.
 
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snoozer

snoozer

Active Member
If you want to kill your alternator and wreak havoc with your voltages, sure. You have the clutch AND the fans cycling with the A/C. You don't want your fans cycling with the clutch.



Yes, exactly the same setup except you don't plug in the fan connector.



You will get a CEL for the fan being disconnected, that's all. Everything will work and run as before. Only issue is that you won't know if another code comes up behind it so you should get the tune done ASAP or check the codes once in a while.

Again, I'd stick with a good name brand (not Dorman or parts store house brands) like Hayden for the clutch. For the tune, lime-swap.com (@limequat ) is good and cheap, $99 shipped. Might as well get other stuff done at the same time like shift firmness and a performance boost. He is very well versed with our platform.
That is my plan then. I will get a hold of limequat & go from there.
Thank you very much for all of your assistance.
Back when I used to fix my own vehicles & help others with theirs I always used name brand parts, but when you forced to rely on someone else to do your work who knows what cheap garbage they are installing.
 

Mooseman

Moderator
Glad we were able to help. :2thumbsup:
 

JPutnam

Well-Known Member
Mooseman, do you have a part number for the clutch? I was going to buy that kit but now you have me leaning to the thermal. Never had a problem with the one on my Tahoe the 18 years I have have had it, and she takes a beating! Im afraid of going to jail for spousal abuse for all the things I have done to poor Christine!
 

Mooseman

Moderator
Hayden 2851, $75 on Amazon. Same on RockAuto but shipping not included.
 
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snoozer

snoozer

Active Member
Mooseman, do you have a part number for the clutch? I was going to buy that kit but now you have me leaning to the thermal. Never had a problem with the one on my Tahoe the 18 years I have have had it, and she takes a beating! Im afraid of going to jail for spousal abuse for all the things I have done to poor Christine!
Here's a link to the Hayden on Amazon:
https://www.amazon.com/dp/B00276J4ZW/_encoding=UTF8?coliid=I1YUWRJ8W36JPU&colid=IGA65576047L

Link to ACDelco for $98.82 on Amazon: https://www.amazon.com/dp/B0016HZY2K/_encoding=UTF8?coliid=I118EDD205ADBQ&colid=IGA65576047L

I myself I am ordering the ACDelco it's a little bit more money, but figured to go original equipment this time around.
 

Locksmith

Well-Known Member
Go with the thermo fan and tune. A lot cheaper than the e-fan setup and less troublesome. There have been some issues with them, including fan motor failure and there is no easy way to activate them with the A/C.

Trust me. I used to be on the e-fan Kool-Aid and went with the thermo clutch. Best decision I ever made.
Brother Mooseman, Please explain how, if I swap out to a 08 thermal fan clutch on my 03 4.2, do I get Lime-Swap to get rid of the codes and bring up performance? What do I have to send them? Please explain in plain English, so an old guy with 1978 mechanic technology can comprehend!
 

Mooseman

Moderator
@limequat would be the one to talk to. Basically, you send him your PCM with what you want done and he returns it to you to reinstall. No more fan codes.
 

rufusthedog

New Member
I installed the pcmofnc Plug and Play kit this weekend. I didn't want to have to send out my PCM to get re-programmed and I didn't want to $250 for a PCM programmer so I took the harness off the old clutch fan and wrote a simple program for a $5 Arduino uno to test if I fake a pulse to the PCM would the light go out......and it did. I have to do more testing but it looks promising.
 

Mike534x

Well-Known Member
@rufusthedog I was going to say, if you had to send out the PCM they (PCM of NC) give you a free voucher to have it programmed for the kit. All you're paying is the return shipping on it.
 

rufusthedog

New Member
@rufusthedog I was going to say, if you had to send out the PCM they (PCM of NC) give you a free voucher to have it programmed for the kit. All you're paying is the return shipping on it.
I knew about their PCM programming for free, I just didn't want be without my Saab for the time it would take to ship to NC from CA. I was also curious if would work or not.
 

Mektek

Well-Known Member
I'm not sure, but I think that if there is a mismatch between the commanded speed and actual speed it will eventually set a code.
If it doesn't you could make the arduino do double duty - reading a temperature sensor and AC clutch power to control the fan while sending the fake pulse signal.

Keep us posted - this may be the best efan solution so far.
 

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