GM HD 2500 P/U Fans Installed

[Fubar]

The fans are wired correctly and running the correct direction.

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by KenP:
Fubar, did they wire the fans incorrectly? </div></BLOCKQUOTE>

[Fastest H-Town Realtor]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Fubar:
Ken,
They say yes and promise an explanation when I go pick up the truck.

honestly I don't know.

I mean you can put your hand down by the fans in the engine bay and yes there is air movement towards your hand but at the same time there is air coming out the bottom front grill. ??? I'm lost.

Maybe there some hyperventilating chipmunk thats taken up residency in my engine compartment/grill area?



<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by KenP:
Fubar, did they wire the fans incorrectly? </div></BLOCKQUOTE> </div></BLOCKQUOTE>


The air coming around the shroud is turbulance. Not a major thing to worry about. If you feel around about any fans ends, you will feel the same thing.

The repair of the dysfuncional rotation should fix the overheating prob. If it is truly a capacity item, then look to Fluidyne to fix that issue. Quality radiators at a reasonable price. Custom built if needed.

So,in recap:

1-Overheats at low/slow speed-Fan/thermostat/coolant delivery prob.
2-Overheats at speed-Capacity prob.
3-Overheats always-H2O pump/engine tune(way off)

[Fubar]

I got my truck back once again from the dealership (only 3 weeks away this time)

Taz,
I am going to assume that I am still going to have problems based on what you've said in this second paragraph.

The fans are running or operating in the correct direction, i.e. blowing air towards the block.

With the truck idling in the driveway the fans came on at just about 200-210 they ran for a bit then shut off. I let if idle a little bit longer and they repeated this function.

Unless I'm not understanding you correctly my normal operating temp now that the 160 t-stat is installed should be somewhere between 160 and 180, correct? And if that true then I still have a problem because normal seams to be just under 210 by the width of the needle.

I leave for Ca in a couple of hours so hopefully it will be an uneventful trip.

I want to tank everyone for there support and advice.

Fubar


<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by HUMMERcustoms.com/TAZ:
Congrats Fubar
As best i can tell from Pics it looks like they did a good job and did it correctly. My eyes are not great but, if You would like to send Me some more detailed pics blown up more in size I will be glad to look the install over real close for you. You know how to get into touch.
Did they get the T-stat wire hooked into the harness at the H2 computer and set Your turn on and off temp?
Well i really feel Your trouble will be over now.
With My setup I have to make 6 WOT runs during tuning without rest in between, to get the rad temp to go to 200 degrees. I'm taking hard runs with no metanol or CO2 spray.
Let Me know if I can help with checking the Pics closer.

Fubar You are right on Allen. Is He not the most accomedating guy You have dealt with. He is just a great guy and I would encourage anyone to ask for help from Him. He is a small shop but, You would not know it by the amount of work He turns out. He does most everything Himself so He makes sure it is done right. He has onw helper and His wife cracks the whip I think.
Well again congrats Fubar!!!!!!!!!!! </div></BLOCKQUOTE>

[HUMMERcustoms.com/TAZ]

Fubar the fan sounds programmed correctly. Unless they just hooked it to the ac switch and then the fan will get power as long as A/C is on. If You turn off A/C and just let it idle and if fan does not come on ever then it is not hooked or programmed to turn on and off at correct temp.
I'm waiting for My new software from HPTUNERS so I have My fans running only when ac is turned on. Once the software gets here I will tune it to come of and on at temps without A/C. If weather is nice and moving 25 MPH or more i turn A/C off and let air from forward movement do the cooling. You just have to remember to turn A/C on.

Fubar You can only do what dealer wants but one of the best examples of putting the 160 drgree t-stat on is Ligenfelter. They do it on every ride. My normal temp run just in 100 degrees not pulling hard is usually 180 degrees. I think at some point You will need t-stat. but, with cool weather coming play their game a while.

Fubar also if You want to come My way go ahead and caravan with KenP and PARAGON.

[Fubar]

Since it is a GM product. GM Parts Guy on this forum should be able to get you a price.

Any Hummer Dealership should be able to install the fans.

However as I am finding out and as it was admitted to me by the service manager and a GM master mech, the H2 even in it's stock form has a very inefficient cooling system. Put a Super Charger on along with it's inner cooler which blocks 1/3rd of the front grill and you have a cooling issue.

Last summer here in town there were non supercharged H2's being towed into the dealership with cooling issues. This I personally witnessed. I've been on the phone with Corporate and customer service for Hummer for countless hours and they seam to think it is an isolated problem here in Nevada during the summer months. This doesn't explain why 2 1/2 weeks ago when it was in the mid 80's on my way back here from Ca and the truck over heated on one of the two 4000 foot climbs over a mt. pass. Nor does it explain why I got a "Hot Transmission" warning indication from the dash display while traveling to Big Bear Lake with an ambient air temp was in the low 60's, Big Bear is at 8,400 feet but I wasn't towing anything or racing up the mountain.

While my dealership is taking forever to do anything with my truck, mostly because they don't know what the trouble is they are covering it under warranty.

I am going to look into a different radiator, oil cooler, trans cooler and possibly a high-out water pump. I need to find a way to dissipate more heat. I agree the t-stat change probably isn't going to solve anything. I also don't believe that any one thing is causing my trouble.

[Fubar]

Ok, went out to the garage, opened the door and started the truck. Lifted the hood to be able to watch the fans although they are loud enough to hear with it closed.

The motor is running the ac is on and the fans (both are running) I turned off the ac and both fans stopped, so I let it idel. It reached operating temp (just below 210)a couple of minutes later both fans kick on so I let it run and a couple minutes later both fans cycled off. So I'm going to assume that the fans are set or programmed to come on at or around 200. The stock thermostat is 195 or 200 isn't it?

So it would appear that the fans are programmed to cycle on and off without the ac being turned on. That's good right?

If I change the t-stat I'm going to need someone to reprogram the cpu to turn the fans on at the proper temp..



<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by HUMMERcustoms.com/TAZ:
Fubar the fan sounds programmed correctly. Unless they just hooked it to the ac switch and then the fan will get power as long as A/C is on. If You turn off A/C and just let it idle and if fan does not come on ever then it is not hooked or programmed to turn on and off at correct temp.
I'm waiting for My new software from HPTUNERS so I have My fans running only when ac is turned on. Once the software gets here I will tune it to come of and on at temps without A/C. If weather is nice and moving 25 MPH or more i turn A/C off and let air from forward movement do the cooling. You just have to remember to turn A/C on.

Fubar You can only do what dealer wants but one of the best examples of putting the 160 drgree t-stat on is Ligenfelter. They do it on every ride. My normal temp run just in 100 degrees not pulling hard is usually 180 degrees. I think at some point You will need t-stat. but, with cool weather coming play their game a while.

Fubar also if You want to come My way go ahead and caravan with KenP and PARAGON. </div></BLOCKQUOTE>

[Fastest H-Town Realtor]

Ok,I will bite...what does the thermostat change have to do with the fan programs? The stat opens at a predetermined temp,usually full warm up,then the ECM shuts off the choke program(rich). So,if the stat opens at 170,and this is "closed loop",then the truck should not need the fans until the temp runs up to whatever temp the ECM has the fans programed for(200?). No heat,no fans. A seperate device from the mechanical stat.

[Fubar]

Just got a call from the dealership where my truck has been for the last two weeks, again.

They are installing the 160 t-stat today and asked if I was using synthetic oils in the trans, motor and difs? I calmly said to the service writer you all have done every bit of work that has been done to this truck you tell me if I'm running synthetic oil...

I know I'm not but the point is they should know.

Anyway it will be interesting to see if the 160 t-stat helps any with the over heating issue.

Oh and they claim that the air coming out from the bottom grill area is just air circulating around the fan, that not all of it gets channeled by the fan shroud. ? I don't know if I believe them. If the fans are running the correct direction why would any air be moving forward, past the radiator and out the front grill?


<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Fastest H-Town Realtor:
Ok,I will bite...what does the thermostat change have to do with the fan programs? The stat opens at a predetermined temp,usually full warm up,then the ECM shuts off the choke program(rich). So,if the stat opens at 170,and this is "closed loop",then the truck should not need the fans until the temp runs up to whatever temp the ECM has the fans programed for(200?). No heat,no fans. A seperate device from the mechanical stat. </div></BLOCKQUOTE>

[Fubar]

FREE!
Covered under warranty.

Since the dealership has done all of the work that has been done to my H2. They installed the flex-a-lite fans and they weren't working or getting the job done so the dealership covered this entire thing under warranty. I know they have several other normal non super charged H2 that are also having over heating issues. So I'm being used as a test subject. It just sucks that it took 8 weeks to get to this point.

I know the wiring harness they used from Nelson Performance was $90.00.

I know this only because I called Allen at Nelson Performance in my efforts to find a solution to my over heating problem. The dealership was just sitting on my truck they hadn't done anything with it for 6 weeks. Once I got them talking to Nelson it took another two weeks of sending out pcm's (which they f*** up) by sending out a generic unit for programming not thinking about the fact that I have a super charger and there would be not program to run it, so they had to send out my pcm and that took additional time.

Anyway there is a long post "dealership problem" on the forum where I bitched about my problems.

You could probably get a price for the fans at GM price guide or isn't there a GMParts guy here on the forum?

The truck is now running at around 200 (210) was its normal operating temp. We'll see what happens next summer when the air temps get to 120. For now I'm simply happy that I'll be able to go to Moab and have a fun trip.



<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Dan:
What was the total cost, if you don't mind my asking. </div></BLOCKQUOTE>

[Fubar]

Taz,
I appreciate your insight and support.

My problem with Allen and or the dealership is that while Allen can change the programming on the PCM so the fans work correctly it is my understanding that in the process of him programming the current program gets wiped out.

The problem with that is one, Allen doesn't have a replacement program to manage the Magnacharger's flue management needs and two neither does the dealership. So this means another month or two of waiting while my pcm gets shipped from place to place.

When I get the truck back I'll see if Magnacharger will allow me to send them my pcm for reprogramming. The best thing would be if Allen could send Magnacharger the PCM after he gets done programming the turn on point for the fans.

I don't know I need to call Allen and speak directly with him because I'm getting conflicting advice from everyone I speak with. You are telling me one thing, the dealership says something different and from my last conversation with Magnacharger they don't see how there product is causing any problems. I can't make them understand that I'm not having problems with the SC it's just that I need to have multiple programs installed on the PCM and no one wants to accept responsibility for some other companies actions... I tell ya if I could afford a $500-$800 monthly payment again I'd sell the rig and buy another one and leave it stock. But I can't so that's not an option and I'm still not convinced that even taking that action would solve anything since I've seen stock H2's towed into the dealership with over heating issues.

You or John (hummersgonewild) need to open a shop out here so I don't have to travel to the East coast to get my problem resolved.


<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by HUMMERcustoms.com/TAZ:
Fubar sorry I did not follow the situation as You got further along. I did not think to check comments on the Pic section. Fubar, Allen programmed Your fans on the PCM He did for the dealer. He sets it for any rig that He is told will have electric fans. He set it to match what ever t-stat the dealer told Him You had. If going to 160 degree which I recommend He would reprogram it again or if He has a copy of Your program which He most likely does, He will be able to change the fan to match the 160 and swap PCM's with You.
The purpose of a t-stat is to get the engine to a temp that the factory wants before it opens and let's the coolant flow through the system and hold usually what ever the t-stat rating is. If the engine starts to cool down then a 190 t-stat will close till the engine temp is back to the 190 degree or higher. Well the same reasoning goes in why You run a 160 degree t-stat on the engine so that if You are having cooling problems or just want truck to run cooler to prevent detonation and yes an engine running to hot with the wrong grade of gas will have or can have detonation. The purpose of the 160 is so that the t-stat opens sooner than a 190 which allows the coolant to begin the cooling process sooner in this case 30 degrees sooner and it has to work with the fans as the fan has to be told that you need it to come on sooner with a 160 t-stat than a 190 t-stat. If You do not then You lose the efficiency of the t-stat and fan working together. The point is to not let it get hotter and have to let the fan work harder to keep the coolant temp low. Let the fans get as early a jump as they can starting to move the air through the radiator once the t-stat has opened to let water flow. Sooner water flows and sooner the fans blow You get cooler temps and everything runs better and lasts longer.
Same thing with many drag racing rigs. They will pull t-stat out completely and I had done on a 1968 Mustang that I raced and I had no t-stat, water wetter, and a higher mix of anti-freeze to keep it cooler so i did not blow a head gasket. Back in those days water wetter was just pouring some denatured alcohol into the radiator. Temp being to high can cause many problems but, one of those is a blown head gasket but, the real concern with cooling is to prevent detonation so that you can run bigger cams, carbs., and eveything else to get more HP.
The only place I would not be in a hurry to lower t-stat temp is in the case of a desiel engine. The fuel already has a high tolarence against combustion so cooler temp on it means jelled fuel if not careful. Everyone has their opinion and when You talk to people like LPE and other major engine and performance upgrade companies and they highly recommend 160 t-stat then it is just a matter of doing what You think You know is the right versus what some others say is the way to go. I personally have run a 160 t stat on My 5.3 Silverado with handheld tuning set a 93 octane runing 87 octane since 1999. Have not had any timing retard by nock sensor's and I did the same thing on the H2 for 12,000 miles and no problem's. So when i got MY sponsored HPTUNERS software i checked the way i was running and it should no problems with what I was doing and this software is at least as good as You can use. Once I up boost to 12 to 15 lbs. I have already seen on tuning that i will have to go up to 93 oct. fuel. Holding the temp low as possible to prevent detonation will no longer work by it self in running low octane and allot of timing advance etc.
Fubar it is MY feeling and many years of experience You have done the right thing by going to 160 t stat but unless the fan is programmed to work with it You do not get all the benefit. If or when you change t-stat call Allen and He will make arraingements to get you an adjusted PCM to work with the cooler t-stat.
There are going to be different and radicaly different opinions on all the different things in the workings of an engine from the oil pan to the carb. or fuel injection. BUt, it seems to Me to look at what the large companies do and recommend as in LPE for one and look at rigs that have followed a different MO and talk to as many as You can to see what is the predominate consensus amoung those who are and have dealt with this problem.
Fubar looks like You have done the things to correct the problem. I wish I had been smart enough to get My dealer to make My change to cover it under warranty instead of Me footing the bill but, I did not hesitate spending My own money because I had a problem with the AC not cooling and temp running to high on the gauge so rather than worry with it I spent about $500 to make the change and have never been happier with the temp. situation. So I hope Yours will be OK come next summer Fubar. Well Fubar My apologies for not thinking about checking quotes on the Pics board.
TAZ </div></BLOCKQUOTE>

[Fubar]

Hey anyone have any experience with this product?

http://www.h2store.com/Shop/ViewProd...eIndexID=38449

Any thoughts?

Thanks

[h2co-pilot]

Fubar, I can't get into the nerd talk. But I know it makes you feel better that they are in- and it looks shiny and pretty. Very cool that the warranty covered it also.

[KenP]

Fubar, did they wire the fans incorrectly?

[HUMMERcustoms.com/TAZ]

Congrats Fubar
As best i can tell from Pics it looks like they did a good job and did it correctly. My eyes are not great but, if You would like to send Me some more detailed pics blown up more in size I will be glad to look the install over real close for you. You know how to get into touch.
Did they get the T-stat wire hooked into the harness at the H2 computer and set Your turn on and off temp?
Well i really feel Your trouble will be over now.
With My setup I have to make 6 WOT runs during tuning without rest in between, to get the rad temp to go to 200 degrees. I'm taking hard runs with no metanol or CO2 spray.
Let Me know if I can help with checking the Pics closer.

Fubar You are right on Allen. Is He not the most accomedating guy You have dealt with. He is just a great guy and I would encourage anyone to ask for help from Him. He is a small shop but, You would not know it by the amount of work He turns out. He does most everything Himself so He makes sure it is done right. He has onw helper and His wife cracks the whip I think.
Well again congrats Fubar!!!!!!!!!!!

[Fubar]

Taz,
I'll call Allen at Nelson Performance tomorrow and ask what programming he put into my cpu. It would still be nice to have your number so that we can talk once I'm on my way to Moab.

[Fubar]

has anyone dealt with Adventure Accessories which seams to be an extension of the parts department for Lynch Hummers out of St. Louis Missouri?


the photos didn't load but they can be found at http://www.h2parts.com

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