A/C

[Jimstepside]

I'm not very happy with the performance with my a/c. It has recently gotten very hot where I live, and just turned the a/c on for the first time on Monday and it pretty much sucks. Can't get any cooler than about 58-60 deg. Anyone else have or had the same problem? Any help?

[Jimstepside]

I'm not very happy with the performance with my a/c. It has recently gotten very hot where I live, and just turned the a/c on for the first time on Monday and it pretty much sucks. Can't get any cooler than about 58-60 deg. Anyone else have or had the same problem? Any help?

[VTSTOMPER]

lower than 58? I didn't even know it went that low...I never tried. That is cold as hell for me! I have been dealing with 90% humidity and 90 degrees up here and my air on 60 has been more than ok.

I know TXSUT has a pulsing in his A/C, but I think he got it all set.

Could it be time for a recharge on it?

[DRTYF? (the imposter)]

My truck is brand new and it sucks sometimes here as well.

[KenP]

Get by the disagreement and read this. It may help.
http://elcova.com/groupee/forums/a/tpc/f/6706011751/m/1131069121/p/1

[HUMMERcustoms.com/TAZ]

My A/C felt week also and I had dealer look at it several times and they said eveything looks good. With learning that I went back to my thoughts of A/C can only lower the temp on average 20 degress from the ambient temp.
But I felt something was wrong.
Before I put the supercharger on I had already before for about a month had an electric fan that fits a 2005 chevy HD truck.
To My amasement the A/C would freeze You out of the rig. I asked the service manager what was gogin on. I had thought I had enough air flow already. He said well this had been a fix to Escalade's for poor air flow that hurt the A/C. He said that it was not a problem that occured very often.
Well it solved My problem so it may be the way to solve Yours. You can get the fan at eadperformance.com.
Then go to nelsonperformance and get the wiring harness that Allen has made for this fan to connect it to the H2. He gives instruction on how to connect it. You will need someone with aftermarket tuning software to turn the fan control in Your PCM and tell it what temp it turns on and off.
INstall is not very difficult if Your fairly handy. the bolts on thf an do not match the H2 so You drill new hole in fan that match. Put a rubber washer between metal and fan and then rubber washer between fan and bolt head to preven the fan shroud from craking . So far I have not heard a complaint on this setup and I love it. You will need to cut tranny cooling lines and take a section out to let the bottom corner of fan to fit into the spot where it locks in at. Just put rubber hose in the cut out section and clamp them down real good. I think like My problem it should solve Yours. I think that Hummer just does not want to recognize this problem with poor air flow through all the H2's. It does seem that it is a problem for some but, not for all. I got no answer from dealer why this is.
Hope this helps
TAZ

[h2sin]

Out of all the vehicle I have driven in the past, H2's A/C has to be the worst one http://www.elcova.com/infopop/emoticons/icon_frown.gif I just learned to deal with it since I love
everything else.

It does do its job with recirculate mode on but I strongly recommand not using it unless its absolutely necessary since it can cause a mildew smell(possible health risk?)over time http://www.elcova.com/infopop/emoticons/icon_frown.gif

[Jimstepside]

I'm glad that im not the only one with this condition. The air good, but it is not great, and I think it should be better. I will look into the electric cooling fans as an option.

[GRZAH2]

I just had my AC start blowing hot air took it to the dealer and they replaced the accumulator. Now it blows colder just not as cold as I have had in past vehicles.

[HUMMERcustoms.com/TAZ]

I would recommend trying the eletric fan. It appears that with trany coolers etc. that there is not enough cool air moving over condenser coils of a/c. The electric fans move about 5000cfm if I remember right, which is way more than the stock fan. If that is the condition then it will just seem like not enough freon but if you do not bring down the temp of freon good enough coming through condensor you will not get cold air of the evaporator coil like you should.
TAZ

[H2 Bill]

My wife is always complaining that ours is too cold! We live in the So.Ca. desert where it gets up to 120 and I have never had a problem with it cooling down in a very short time. It's one of the best systems that we have had down here. Our Suburban take a good 10 mins. to cool down and the Corvette takes about 5 mins. The H2 is cooled down within a couple of minutes on a 95-105 day after sitting in the sun all day and maybe 5 mins. on a 110+ day.

[DavidAragon]

...
along this same line... Does anyone know if the A/C compressor runs when the A/C button isn't pushed or is not on AUTO? Usually, I just have it down on 60 without actually using AUTO or the A/C compressor...

I'd like to continue to do that but if I am indeed using my A/C anyway, I might as well use my recirulate or AUTO mode...

Thanks,
David

[ARH1956]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by DavidAragon:
...
along this same line... Does anyone know if the A/C compressor runs when the A/C button isn't pushed or is not on AUTO? Usually, I just have it down on 60 without actually using AUTO or the A/C compressor...

I'd like to continue to do that but if I am indeed using my A/C anyway, I might as well use my recirulate or AUTO mode...

Thanks,
David </div></BLOCKQUOTE> Default for the system is A/C on. Unless you push the "Snowflake" button to cut it off, the compressor will run when called upon. When you push the button you'll see a "Snowflake" with a / through it telling you the A/C is off.

[madcat]

RLTAZH2, can you post pics of your fan set-up?
I have a SC cooler if front and want to see if it will fit. Thx

[DavidAragon]

Thanks for the info, all this time I never noticed that line through the snowflake...

Thanks,
David

[GeorgeSSSS]

Regarding AC not getting cool enough -- -- I've found that using the recirculation button makes all the difference. This may be too obvious, but it works for me.

George SSSS

[Beastmaster]

To add:

A properly working (read - airflow through the condenser coils and a properly charged and oiled system) R134a system will reduce the ambient air temp about 30 degrees at the air vent.

If you live in an arid and dry area like Arizona, there are many times where the outside ambient air temp is lower than the inside cabin air temp. (Example - when the outside ambient air temp is 110 degrees F, my inside cabin air temp can he as high as 130, according to the little thermometer clipped to my air vent. This is when my truck is outside in the sun for at least 3 hours in the afternoon)

In situations like this, running on recirculate actually ends up being less efficient than running on a non-recirc setting....hence the joke about Arizona residents finally getting cold air out of their A/C when they get to their destination.

A Spal or Flex-A-Lite fan will do wonders. I have a Spal add on fan for my A/C condenser and I get cold air all the time - even when I'm stuck in traffic.

[ira]

TAZ,
my ac doesnt get cold enough.
where did u exactly install the fan?
could you send me some pics?
could i just manualy on and off the fan by switch when i need it?
thanks.

[VTSTOMPER]

i have noticed now that at a stop the AC will blow warmer when it is on Auto. But when I am driving it is much cooler.

[LasVegas]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by VTSTOMPER:
i have noticed now that at a stop the AC will blow warmer when it is on Auto. But when I am driving it is much cooler. </div></BLOCKQUOTE>This is a common problem in extreme temperatures. It's a simple matter of the refrigerant reaching some critical temperatures preventing it from condensing to a high pressure liquid. This all happens in the condenser coil attached to the radiator. Be sure your radiator and condenser coil is clean. Wash it out good with a hose removing all bugs, dirt, etc. and have the a/c serviced to be certain it's properly charged. If none of that helps, replacing your factory belt driven fan with electic fans will improve this greatly.

[Arabian Mullah]

Is there room in the front grill to place a "pusher" type electrical fan? It gets very hot here and the A/C in our Expedition was not as cool as we would have liked. So I had the dealership place a fan in front. That way there is even more cooling power.

[VTSTOMPER]

Thanks Jonahs!

[HUMMERcustoms.com/TAZ]

Guys I'm sorry I have not checked back on this thread. Anytime I have discussed something please feel free to PM Me for more info.
madcat I think if You do a search for electric radiator fans it will come up.
Basicly You remove Your mechanical fan and fan shroud. The electric fan from Eadsperformance with it's own shroud is what I used. It is for a 2005 3/4 ton chevy truck. the wiring harness You purchase from Nelsonpreformance.com He hand makes them. You can find someone with tuning sofware that will allow you to tie the harnees into the PCM harness and program it to come on and off at certain temps. I would take Pics but, My rig is in paint for ghost flames and clear coating.
It is quite simple and You will have to drill new mounting holes in the new shroud to match the prethreaded holes for the shroud screws from old shroud placement. Place rubber washer between the shroud and core support as well as washers between the radiator shroud and flat washer on the bolt to hold shroud on.
You will have to cut out a section tranny lines down on the left bottom side for new shroud to get it to fit. You splice rubber hose from the left metal tranny line and the metal You leave saved in length after cutting the section out leading to tranny cooler.
I'm sorry if I have done a poor job. I have been ill and most will tell You I go indepth to much when explaing things. I will get Pics but, I think You will find them in a search.
Rick

[MUH_HUM]

<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:
Guys I'm sorry I have not checked back on this thread. ....I'm sorry if I have done a poor job. I have been ill and most will tell You I go indepth to much when explaing things. I will get Pics but, I think You will find them in a search.
Rick </div></BLOCKQUOTE>

This is only 1 of about 5 TAZ threads I could get through before he was so over my head I gave up! http://www.elcova.com/infopop/emoticons/icon_biggrin.gif

[h24us]

I was experiencing two problems with the H2 that was purchased approximately a year ago.

1. Problem was with turning the steering wheel in a tight area. It seemed to stick as I attempted to turn the wheel in either direction (same symptom as a lose fan belt) without the squeaking noise normally associated with a lose fan belt. This anomaly occurred before the air-conditioning failed to cool.

2 . The air conditioning would only get cool but not cold as it had prior to the problem.

Tuesday, I drove to the dealer for my appointment and explained my two problems before driving home in a rental. That day, the car was ready and I was informed that air conditioning was checked for leaks and red dye used to determine if there were any leaks. They found no leaks and recharged the system. The service rep and I tested the steering problem and found no sticking while turning the steering wheel in either direction.

I drove the vehicle home with the air conditioning at full blast and it only cooled when I arrived home 25 minutes later. I could not understand why the air conditioning was not delivering crisp cold air as it had when I first purchased the vehicle.

I called the Dealer the next morning to schedule an appointment that day. I discussed my problem with the air conditioning not delivering crisp cold air. He later had me talk to his manager who explained that all the High and low PSIs and cabin output temperature are within specification and said there is not much they can do at this point. He said the air is fine and the lack of coldness is subjective. I asked if they would pay for an independent air conditioning specialist and he said it really depends on what they do.

Later that day I had an independent Air conditioning specialist perform an analysis of the system in question and he found that they were out of specification on internal cabin vent temperature and the volume of Freon was ˝ lbs short. He cleared the system and added Freon to 1.6 lbs. Now the air is cold and crisp as it should be. He said the analysis showed that the system was being under utilized and that all three areas must be checked: PSI, cabin vent temperature and Freon volume.

I returned to the dealer (by his request) and explained what they did and we took it for another test run to measure the ambient temperature and the internal cabin vent temperature and found only 5 degree temperature difference. He asked if I was happy with the cooling system and I said yes (now that it’s working properly) and to provide customer satisfaction he reimburse the cost charged by the independent air conditioning specialist. However he did warn me that I could void the warranty on the air conditioning by taking it to a specialist with less training and qualifications as the dealer.

Approximately a week later I returned to the dealer with cool air as before. The dealer found and replaced a leaking orifice tube. They EVAC and recharged the A/C system.

On my way home the air conditioning did not perform as expected and returned to the dealer a few days later. They inspected the system and found everything to be within specification. I asked if they could check the Freon level and he said they would not spend the additional time to check the Freon level.

Concerned about voiding the warranty I took the H2 to Mr. GoodWrench and found they do not cover warranty work on H2 vehicles. Since there is no other H2 dealer in the area, I had no choice but to use Mr. GoodWrench.

They found the system PSI and cabin vent to be in specification. However, they recovered 1.27 lbs of Freon and recharged to specification of 1.6 lbs. They also found a possible fan clutch poor engagement.

The system continues to work well but not as well as it did when I took it to the independent A/C specialist.

I received a call from Towbin Hummer to call then if I was not completely satisfied with the service department. I explained my problem to the caller and they in turn had the same manager call me. I return his call and informed him that I had taken to GM service center and they found the Freon to be at 1.27lbs, he said “how can that be” I informed the dealer that they did all that they can do.
Dealer follows process and procedures disseminated by the upper echelon, chief engineers, project manager and their team leaders. This is why I am writing to you.

In final review, I find that your process or procedure concerning this matter should be re-examined to obtain the best quality product to your customer. I have been face to face with the service manager and he has dug his heel in. His process does not allow him to think outside the box or Initiate CPI (Continues Process Improvement). With only one dealer in town, I as a customer is stuck with no warranty coverage with a standoff such as this and an out of pocket expense of $139.17

I return the survey on how they did with a two page letter. In turn they called and the guy on the other end was rude. Again I find myself at a dead end street. I suppose my next step would be to sent it to the CEO.

[GeorgeSSSS]

h24us:

Sorry to hear about your trouble. You would think the H2 dealer would be the MOST knowledgeable person about AC in a place like Las Vegas where keeping your car cool is critical. Unfortunately, AC sometimes seems to be a weakness of the H2 based on other posts I've seen. I'm thinking about installing Flex-A-Lite dual 19" electric fans that come attached to a shroud that exactly fits the brackets on the H2 radiator. I am told this solves the problem. I've heard it also improves gas mileage about 1 mpg by decreasing drag on the engine by about 17 hp.

A cheaper solution might be to buy a replacement fan that has flexible blades attached to the vanes. At low speed, the blades have a sharp angle of attack and move alot of air past the radiator/condensor. At higher speed the flexible blades flatten out and let the air pressure in front of the moving vehicle do the job. I installed a system like this on my car about 35 years ago when I had an overheating 396 Chevy and it solved the problem. Don't know if it would work for you, but I don't believe it would be too expensive to give it a try.

Don't know whether GM would give you warranty grief if you make any of these changes.

There are other people on this forum who know alot more than I do. Maybe some of them will weigh in.

Good luck,

George SSSS