Electric Fan on 2007 Hummer H3

[GreatDaneHummer]

Anyone install the PCM NC electric fan yet? How do you like it if you have etc? Noticeable power difference?

 

[humvee]

Haven't yet heard of someone who's successfully done that.
Amrg is in the middle of installing a dual efan setup to cool his LS3. He should chime in when its done and tested.

The Spal fans came stock on SA H3 Alpha models in addition to the clutch fan, at a time when the H2's got their Cfans completely replaced with a dual efan setup.
I think Hummer tried and ditched doing the same with the 3.

 

[amrg]

Simply stated, throttle response with an efan is extremely different. Much quicker and noticeable.
As for cooling, Im NOT running a pcmofnc setup so I cant tell you if it cools properly.

 

[digglesworth]

ive heard they dont keep up with cooling. a custom setup might be a better route to go...
If you're looking for a little more pep in your H3s step, check into the super modulation ported and polished throttle body. It was just over $100 when I got mine and you just send him your old one. He's over on the 355nation forum. That's a Colorado forum...

 

[rsc]

AMRG is 110% correct. (I know from experience)

 

[Best4x4]

DO NOT INSTALL THE PCM Efan!!!!!!!!!!!!!!!!

The fact they still sell that thing is a mystery to me! I installed one 6 months after getting my H3 Alpha. I took a road trip to San Antonio, TX (about 4.5-5.0hr trip from my house) shortly after installing it (all other driving was just short trips into town). Well once out on I-10 the temp started to climb (I use a Scangauge II to monitor stuff). Just before I got to Houston, TX the temp went out of it's normal range and continued to climb slowly. My wife wanted to make a stop, so I pulled over and while she was inside the store I popped the hood and crawled under my H3 Alpha to investigate. Nothing at all was wrong, but it was running hot. My wife came back to find me laying under the H3 so my gig was up as far as acting like everything was ok.. I removed my lower skid plate to help get some of the heat out, and I left the hood open to let it cool back down. After that I got back out on the road and now both of us had our eyes glued to the Scangauge. It went 210, 213, 216, 218, 220, 224, 226, 228, 230, 235, and the highest I saw was 237F.....

I'm 100% sure if by a miracle it hadn't started to rain on us (it was during a massive drought in TX) that my lovely 5.3L V8 would have died a horrific death due to that POS Efan! We got to our destination, I monitored the temps as we cruised around San Antonio, and on our return trip I left after the sun had gone down. We made it, and I immediately removed that Efan, and installed all the OEM stuff back (thank goodness I saved it!!!). My temps went right back to normal and I had no more issues after that.

I emailed PCM of NC ASAP, and they honestly didn't seem to care, and said well we tested it here in NC without any issues. I can tell you right now NC and TX temps are nothing alike and that setup is NOT up to the task. I told them how it almost caused a perfect V8 to almost blow up, and that I'd like my $$$ back. That was like pulling teeth, and after going back n forth with them I gave up....

Issues with the PCM Efan:

1. Fan does not sit centered and I believe it makes hot spots (they redesigned the shroud shortly after with louvers on the offset part, but I was never emailed back with an offer to send me a free replacement for my terrible experience...)

2. The Efan itself DOES NOT pull enough air thru at cruising speeds to keep up with the heat being generated. (at idle it could keep up well)
3. Sounded like a 747, but it certainly wasn't pulling as much air.
4. PCM of NC lost my PCM that I sent in to have the Efan option enabled (took em two weeks to finally locate it and send it back) I couldn't drive my H3 in the meantime...


The only good thing about the Efan setup was the wiring harness and relay. It was very well made and wrapped. It's the only thing I kept of the entire kit (I later wired in an aux efan of my own along with the OEM fan clutch setup, and I am using a 96-98 Ford Explorer 5.0L V8 Metal Fan Blade vs the GM Plastic Fan Blade).

IMHO avoid that kit like the plague, and find something else or do like I did and leave the OEM setup, get a new fan clutch, and wire in an aux pusher fan to help.

 

[Hopkins86]

I just installed it on my 2006 h3 and it runs like 24/7 and my hummer is actually running a little warmer then it use to when I have the ac on its like it don't shut off at all

 

[Hopkins86]

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[Hopkins86]

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If I Cruz thru town it gets hot in the pic above and when it sits at a ideal it kicks off and on I can actually turn the fan off and on with the ac I'm confused about that if I turn the ac on it runs pretty much the whole time any ideas on what to do


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[Bigunit]

Something is definitely wrong but I have no idea what since I don't have an E-fan.

 

[JPaul]

It runs while the ac is on because it has to cool the ac condenser down as well as cooling the engine coolant in the radiator. If it's not constantly cooling the condenser your ac isn't going to cool very well.

If you're having problems with it just switch back to the stock clutch fan, there really isn't anything wrong with the stock setup.

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[Hopkins86]

I'm going to make a video in the morning and post it maybe that will help you guys think with me I'll hook my scan tool so we can see actual temp numbers on it


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[Hopkins86]

It runs while the ac is on because it has to cool the ac condenser down as well as cooling the engine coolant in the radiator. If it's not constantly cooling the condenser your ac isn't going to cool very well.

If you're having problems with it just switch back to the stock clutch fan, there really isn't anything wrong with the stock setup.

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I wanted to run the e fan 4 a lil more hp pcm of nc said I could get 10 more hp and 1-2 mpg I fig that would help with the other stuff I did to lug the 35s


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[GreatDaneHummer]

There has been a lot of talk about their E-fan already and I think most would agree that it is not adequate to keep up with the demands of the H3. If you want to do an E-fan setup correctly the problem is it costs money, much more than the $500 or whatever the PCM is.

 

[Hopkins86]

I wonder if I can just buy the better fan and use the pcm harness or maybe put a lower temp switch


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[rsc]

The PCM e-fan looks like a nice bit of kit. It only moves 3500 cfm, they say, compared to around 8-10k cfm with the mechanical fan. It seems to work well unless you are in extreme conditions. As would all e-fan setups.

 

[Hopkins86]

I just don't understand why it's not kicking in why I drive around town like it does when it sits I'm not sure it even does when I run high way speeds if I don't turn my ac on in town it will go 3/4 of temp gauge if ac is on it runs at operating temp


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[rsc]

I just don't understand why it's not kicking in why I drive around town like it does when it sits I'm not sure it even does when I run high way speeds if I don't turn my ac on in town it will go 3/4 of temp gauge if ac is on it runs at operating temp


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Is your PCM reprogrammed for the e-fan if you have an 08-10 H3? Or do you have the other version with the temp sender?

 

[Hopkins86]

Is your PCM reprogrammed for the e-fan if you have an 08-10 H3? Or do you have the other version with the temp sender?

I have a 06 I sent my pcm in 4 the tune and they told me they would do the patch also why they had it


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[rsc]

Hmm, interesting. I had thought the 06-07 needed the temp sender ring installed inline with the radiator hose and only the 08-10 models could use the pcm to trigger the fan. :/

 

[Hopkins86]

I did put a sensor spliced into the bottom rad hose I think what pcm did was turn of some code it would throw due to the mod


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[rsc]

Gotcha. I was reading the other thread, sounds like it is working right.

 

[Lunesta2]

I have a supermodulation dual electric fan setup sitting in my garage if you want it. It was on my H3 for about 6 months. It would be a real pain to ship I think. There is a temp sensor that goes in the lower rad hose. It worked fine. I put everything on my H3 back to stock though. The most noticeable part of the electric fans will be the engine is quiet from outside when they aren't on.

 

[Hopkins86]

I have a supermodulation dual electric fan setup sitting in my garage if you want it. It was on my H3 for about 6 months. It would be a real pain to ship I think. There is a temp sensor that goes in the lower rad hose. It worked fine. I put everything on my H3 back to stock though. The most noticeable part of the electric fans will be the engine is quiet from outside when they aren't on.

Get a ship quote to send it to 47558 that's my zip code and let me know what it cost and send me some pictures of it my cell is 8127992831 I'll give you something 4 it


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[Best4x4]

The PCM wiring harness is the only part of that kit worth a darn. The fan shroud leaves gaps, the fan can't be centered (water pump pulley is in the way), fan is loud, and doesn't move enough air. It is a complete and total joke.

Like I posted earlier in this thread I bought one I tried it and it was a massive disappointment to me for several reasons. PCM of NC almost completely lost my PCM, I almost blew up a perfectly good V8, and PCM of NC DID NOT stand behind their product at all (never issued me a refund or even tried to make me the customer happy)

I went back to the OEM setup, kept the PCM of NC wiring harness, and since my PCM was programmed for an efan I added a 12inch efan in front of the HVAC condenser. Then I replaced the plastic GM fan blade with a Ford Explorer 96-98 5.0L V8 Metal Fan, and installed a new fan clutch (easy to look up using the Ford Explorer as they share the same fan clutch and when you tell them V8 H3 they normally always come back with an I5 Fan Clutch).

This summer marks the first time I haven't seen my 5.3L V8 H3 Alpha with an ARB Bumper and Warn Winch running hot down the road at idle or in traffic. My Temp gauge is dead center down the road and at idle it goes maybe 3mm above half. Before 100% OEM it was 3-5mm past half going down the road, and it would get to 220F range pretty quickly at idle or in traffic. The PCM of NC Efan was 216-237F = A JOKE...

So my advice is if you have an 08-10 get someone to enable the efan option add one in front of the HVAC Condenser, grab a Ford Metal Fan Blade if you have the V8, and certainly get a brand new fan clutch. I'm also running green 50/50 coolant vs dexcool.