My 03 D'Max did not cool on hot days over 80+ http://www.dieselplace.com/forum/smileys/Cry.gif , but seemed fine otherwise. Here is what the work order says they did :

Perform A/C System Check per 02-01-38-007A.
Recalculate Actuators per ST Doc #904666.
Evacuate & Recharge system using 1.6# R-134 per bulletin 02-01-38-007Now it's a meat locker!! http://www.dieselplace.com/forum/smileys/Clap.gif

<H1>Poor A/C Performance - A/C will not Blow Cold Enough (Perform A/C System Checks) #02-01-38-007A - (06/05/2003)</H1>
<TABLE>
<T>
<TR>
<TD>Table 1:</TD>
<TD>A/C Performance Table - 6.6L (http://service.gm.com/servlets/BlobShtml?ShtmlFile=1341169&amp;evc=numSrch#tab3-1341169)</TD></TR></T></TABLE>Poor A/C Performance -- A/C Will Not Blow Cold Enough (Perform A/C System Checks)


2003 Chevrolet Silverado


2003 GMC Sierra


with 6.6L Diesel Engine (VIN 1 -- RPO LB7)


This bulletin is being revised to update a temperature reading under Condition and to change the A/C Performance Table under Correction. Please discard Corporate Bulletin Number 02-01-38-007 (Section 01 -- HVAC).<A name=ss1-1341169><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1341169&amp;evc=numSrch#ss1-1341169" target="_blank">
<H5>Condition</A></H5>


Some customers may comment on less than desirable A/C performance, especially when ambient temperature is above 32°C (90°F).<A name=ss2-1341169><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1341169&amp;evc=numSrch#ss2-1341169" target="_blank">
<H5>Correction</A></H5>


If normal diagnostics do not lead to a correction, then perform the following A/C system checks.

<LI =1>Re-calibrate the actuators. Refer to Recalibrating Actuators in the HVAC System - Manual/Automatic sub-section of the Service Manual (SI Document ID #904666).
<LI =1>Inspect the lower A/C condenser deflector for proper installation. The deflector should be positioned at the lower part of the condenser and extend forward into the top of the front bumper and below the two fresh air intake holes.
<LI =1>Check the engine cooling fan clutch for proper operation. Refer to Fan Clutch Diagnosis in the Engine Cooling sub-section of the Service Manual (SI Document ID #774320).
<LI =1>If the vehicle is equipped with a front license plate, inspect for proper installation. If the license plate bracket is installed upside down, it will block part of the two fresh air intake holes in the bumper. When the license plate bracket is installed correctly, the writing on the back of the bracket will be upside down.
<LI =1>Some improvements have been found by lowering the A/C charge from 0.82 kg (1.8 lbs) to 0.73 kg (1.6 lbs). When recovering the A/C charge, recovery must be pulled for at least 45 minutes.
<LI =1>Check the low pressure cycling switch for proper operation. The low pressure switch opens at 148 kPa (21.5 psi), which stops compressor operation and closes when the low side pressure reaches 276 kPa (40 psi). This enables the compressor to turn back on.
<LI =1>When performing the refrigerant system performance test, refer to the updated specification chart listed below. </LI>
<TABLE width="100%" border=1><A name=tab3-1341169><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1341169&amp;evc=numSrch#tab3-1341169" target="_blank">
<H4>A/C Performance Table - 6.6L</H4></A>
<T>
<TR>
<TH vAlign=bottom align=middle rowSpan=2>


Ambient Air Temperature</TH>
<TH vAlign=bottom align=middle rowSpan=2>


Relative Humidity</TH>
<TH vAlign=bottom align=middle colSpan=2>


Service Port Pressure</TH>
<TH vAlign=bottom align=middle rowSpan=2>


Maximum Discharge Air Temperature</TH></TR>
<TR>
<TH vAlign=bottom align=middle>


Low Side </TH>
<TH vAlign=bottom align=middle>


High Side</TH></TR>
<TR>
<TD vAlign=center align=middle>


13-18°C (55-65°F)</TD>
<TD vAlign=center align=middle>


0-100%</TD>
<TD vAlign=center align=middle>


150-279 kPa (22-41 psi)</TD>
<TD vAlign=center align=middle>


420-1140 kPa (61-165 psi)</TD>
<TD vAlign=center align=middle>


9°C (48°F)</TD></TR>
<TR>
<TD vAlign=center align=middle rowSpan=2>


19-24°C (66-75°F)</TD>
<TD vAlign=center align=middle>


Below 40%</TD>
<TD

dmaxalliTech,


Details, details. No wonder you're so good! http://www.dieselplace.com/forum/smileys/HiHi.gif


Thanks, we need this kind of access, especially when we can't all have access to a great tech like you!!http://www.dieselplace.com/forum/smileys/Clap.gif

But can you believe some of the temps that are considered acceptable. Explain how 80 degree air is going to cool off your interior when it is 105 outside!!!http://www.dieselplace.com/forum/smileys/Angry.gifhttp://www.dieselplace.com/forum/smileys/Angry.gifhttp://www.dieselplace.com/forum/smileys/Angry.gif. This sure seems to be a CYA document on the Generals part!

CS-Dmax,


Can't speak to the 80/105 but I can say that when presented with this information in advance my dealer fixed my truck the first time in and it is ice cold now regardless of outside temp. Most days I have had to run the fan on 1 and the temp on 74 or I get froze! That is a huge difference from before they fixed it with this TSB as the basis!


Since most of us don't have access to dmaxalliTech, this information helps a lot, especially if there is a uncooperative stealer involved! It keeps them from playing games and tellin you you're nuts or don't know what you're talkin about or sayin no one else is havin this problem! Or whatever other line of BS they might try to sling!


2DAMAX

Oh, I agree whole heartedly. I got mine fixed a couple months ago based on the same TSB. I too feel dmaxalliTech is an invaluable resource to the forum membership. My comments were directed at the load of BS that the General wants to stuff down the throats of us, the buyer of a $40,000+ truck. To say that those kind of vent temps are acceptable is beyond belief.http://www.dieselplace.com/forum/smileys/Angry.gif


dmaxalliTech, I hope you did not think that my rant was directed at you. If so, I apologize for that. Not my intent.http://www.dieselplace.com/forum/smileys/Confused.gif


John

dmaxalliTech, I hope you did not think that my rant was directed at you. If so, I apologize for that. Not my intent.http://www.dieselplace.com/forum/smileys/Confused.gif


John





John, never even thought of it. You have nothing to apologize for. I have found that by providing a few minutes of time, I am able to help alot of you get your issues handled in a more responsive way, thats why I do it, and I appreciate all the kind things your all saying, It makes it worth while http://www.dieselplace.com/forum/smileys/Clap.gif

My dealer performed the items on the bulletin, I must say it did help quite a bit. My wife has a 2003 Tahoe and it cools so much faster, It will freeze you out if you leave the automatic temp set to 60, even when the temp is above 95. I have to leave my 2003 Duramax on 60 all the time when the temp is over 85 outside. To keep it halfway cool. The Service manager did tell me the Tahoe uses a different compressor.

demaxalliTech


Will the TSB address the output of the fan in regards to the settings(1 thru 5)? The switch at times when on 5 seems no more air than level 2 and seems to have a mind of its own. I have an early 02 LT

demaxalliTech


Will the TSB address the output of the fan in regards to the settings(1 thru 5)? The switch at times when on 5 seems no more air than level 2 and seems to have a mind of its own. I have an early 02 LT





Sounds like you may have other issues there, On level 5, the speed is just like level 2? Could be a blower resistor or switch

BROUGHT MINE IN YESTERDAY AND THEY SAID THERE WAS NOTHING WRONG......IT'S CLOSE TO WINTER SO I SAID "oK" AND STILL HAVE 35 MONTHS LEFT ON WARRENTY SO WILL BE BACK IN THE SPRING!http://www.dieselplace.com/forum/smileys/Ermm.gif

Are these ;


Perform A/C System Check per 02-01-38-007A.
Recalculate Actuators per ST Doc #904666.
Evacuate &amp; Recharge system using 1.6# R-134 per bulletin 02-01-38-007


only for the 2003 with climate control?


Are there other TSB's aimed at 2002?


Had cycle switch changed (#89040362) evac &amp; recharged @1.8 lbs.


outside Temp@ 94 deg. , output in center vent putting out 56 deg. I would think it should be cooler.

Just did the above mentioned bulletin and still does not work properly.


It was 93 outside and at max fan on center vent did not go below 56. What is everybody else getting?? I remember my 2001 Silverado 6.0 had a weak AC. I live in Southern CA so no humidity down here.


Marco Polo


2003 2500HD Duramax

This is also being covered on http://dieselplace.com/forum/forum_posts.asp?TID=1344&amp;PN=2


Topic: A/C Insufficient cooling problem


In that thread GMCSID states


I learned today the insufficient A/C cooling problem on Duramax equipped trucks has been pinpointed to the accumulator. GM is coming out with a new one soon to correct the problem. Some have attempted to repair this with a different oriface tube and a lower refrigerent charge. GM recommends you wait for the new part instead.

Has anyone heard any more on Notsdale's comment on a new accumulator as a fix for this issue? My '04 has the same problem but I'm waiting for it to heat up so it's easier to test.

Bob

The Service Manager at my local GM Dealership has told me he seen about it, and is wating for the TSB to come out. He advised me he would contact me as soon as he gets the TSB. Maybe if dmaxalliTech or some of the GM Tech's here on The Diesel Place see this they may know more about the accumulator being the problem. I sure hope they have it out by summer here in Wyoming!!!

I took mine to the dealer for this. They told me to bring it back next Summer! http://www.dieselplace.com/forum/smileys/Angry.gif

BigMoe,

If you hear from your service mgr on this let us know please.

Thanks,
Bob

Bob,


I will and I am sure dmaxalliTech, GMCSID or some of the other GM Tech's will also, they had been in some of the dicussions about it. I don't have to worry about that for a few more months but I am sure there are some that don't. Right now I worry about getting the cab warm enough.

Any news yet on a new update procedure? Summers coming.

Good question. I've been awaiting the new fix as mine is a poor performer too.

Mine too. Today we had almost 90 degrees in Southern California and my AC was real weak. This will be my 3rd trip back to the dealer. Any solutions???

This is also being covered on http://dieselplace.com/forum/forum_posts.asp?TID=1344&amp;PN=2


Topic: A/C Insufficient cooling problem


In that thread GMCSID states


I learned today the insufficient A/C cooling problem on Duramax equipped trucks has been pinpointed to the accumulator. GM is coming out with a new one soon to correct the problem. Some have attempted to repair this with a different oriface tube and a lower refrigerent charge. GM recommends you wait for the new part instead.






it appears that GM must of put this on the back burner and forgot about it. I am wondering if there is any way to contact GM about this, and get the ball rolling!!!!!!!

So as not to start a new thread.. Is there any TSB on weak A/C on 04 GMC's D/Ahttp://www.dieselplace.com/forum/smileys/Geek.gif Mine seems to be weak. It's 90 out and I run my A/C wide open. Wondering waht the output temp should be at the outlet?? Thanks for all the helphttp://www.dieselplace.com/forum/smileys/Clap.gifhttp://www.dieselplace.com/forum/smileys/Clap.gif





Cosgrovehttp://www.dieselplace.com/forum/smileys/Clown.gif

Here is another 04 not doing so hothttp://www.dieselplace.com/forum/smileys/Cry.gif Took it into the stealer two days ago, about 65 degrees out. I was told it took the temp down to 50 degrees which is acceptable. But with the fan set to 5, if I back off the slide bars even 1/16 " it blows almost warm air.

Mine came back with the TSB work done and I did not notice any difference, but it was cool outside. Today it was in the upper 80s and I was cooler with the windows open that it was with the a/c on max. When I called the dealer, he said to bring it in on Thursday. I told him it would be cool on Thursday but that was the earliest he had. So I went out and asked him to check the temp at the outlet. He agreed and said it was just barely within specs. Nothing else can be done, in his opinion the compressor used with the duramax is not sufficient (and it is a none-GM one). He agreed with me that with the high discharge temps that there is no way to cool my truck.


When I called Chevy they started a BBB complaint for me but again THERE'S NOTHING THAT THEY CAN DO.


Does anyone have any other suggestions?

I talked to the shop foreman last Saturday while having the truck serviced.


Anyway, he said the A/C design was back to the engineers to get a fix out. He stated that if you thought the DMax was bad at A/C performance, just try an Envoy. The main problem with 2003 and up is the fact that they split the evaporator into to separate units so you can have the dual-zone. Seems like the General is having problems with all dual-zone systems.


I wouldn't expect a fix soon....


L8r

Also have an 04 D/A that wont cool sufficiently. Didn't know in November I was buying a $ 44,000.00 swamp cooler. It is at the dealer for the third time and I don't have any expectations that it will be any better.

Get ahold of hasselbach - he may be able to provide information that you can take to your Service Manager to make yours a little better.

Any news on an updated TSB or recall? It is hot down here in NC, and this air conditioning system isn't cutting it!

OK guys... This is my second summer with the truck and I have learned a couple things about the A/C...


First off, take it out of AUTO, run the fan speed to the second highest speed (one below the maximum speed), and hit the RECIR button and dial the temp all the way down. I've done this on 100 degree days and my truck is comfortable after a couple miles, and this is with the truck being parked in full sun for 8 hours prior to starting.


After the interior cools, then you can select AUTO and set your temp.


Of course, higher engine speed and air through the grill are a must. If you are stuck in stop-n-go traffic it is gonna take longer to cool. The RECIR helps here too. I was running along I-20 in Louisiana and got stuck in construction. After a few minutes, it started to get warm in the cab, so I switched off the AUTO and went into manual RECIR mode and the cab cooled down again.


L8r

With my AC control ON AUTO, my truck does exactly this on it's own. And yes, recirc does certainly help cool the truck more than if it pulled on outside air at 100 degrees. But this system just isn't sufficient. It IS much better than NO AC, but not nearly as good as almost every other vehicle I've ever owned.


IMO, of course.

Well guys...the waiting is OVER !! talking to my service mgr today...mentioning all these tsbs and sh*t...there is now a tsb on replacing the accumulator on these dmaxs..mines an 03...the tsb came out in the beginning of july this year...GO FOR IT... i will have icicles hanging out the dash yet! later bc


ps it will also include a bracket and insulation for a pipe..


this is really a marginal system..good luk http://dieselplace.com/forum/smileys/Angry.gifhttp://dieselplace.com/forum/smileys/Clap.gifhttp://dieselplace.com/forum/smileys/HiHi.gifEdited by: bob camire

Well guys...the waiting is OVER !! talking to my service mgr today...mentioning all these tsbs and sh*t...there is now a tsb on replacing the accumulator on these dmaxs..mines an 03...the tsb came out in the beginning of july this year...GO FOR IT... i will have icicles hanging out the dash yet! later bc


ps it will also include a bracket and insulation for a pipe..


this is really a marginal system..good luk &lt;IMG alt=Angry src="http://dieselplace.com/forum/smileys/Angry.gif"&gt;&lt;IMG alt=Clap src="http://dieselplace.com/forum/smileys/Clap.gif"&gt;&lt;IMG alt=HiHi src="http://dieselplace.com/forum/smileys/HiHi.gif"&gt;

and the TSB nubmer is ......http://www.dieselplace.com/forum/smileys/Question.gif

[QUOTE=bob camire]

Well guys...the waiting is OVER !! talking to my service mgr today...mentioning all these tsbs and sh*t...there is now a tsb on replacing the accumulator on these dmaxs..mines an 03...the tsb came out in the beginning of july this year...GO FOR IT... i will have icicles hanging out the dash yet! later bc


ps it will also include a bracket and insulation for a pipe..
~~~~~
Hey Bob & all ...

Mine's been in the shop for a week. Took it in a month ago and they said they had to order parts. They called last week and said parts were in, so I took it in on 7/22. 7/22 evening said rcvd incorrect accum hose needed to re-order ... it's 7/29 now and still no hose. Just talked w/dealers svc mgr and:

1) TSB # is 02-01-38-007C
2) Kit is like Bob described: Accumulator, Accum hose, 2 brackets & some insulators ... mine is missing the accum hose.

Svc mgr told me the kit (or parts?) was just released on July 27.

According to svc mgr, since mine has been torn down for a week now, they are trying to expedite thru SPAC (Svc Parts Asst. Ctr), but no ETA yet.

GM put me into a rental (they're paying), so been driving a 2004 GMC 4-dr Canyon for a week now ... but, I want that rumblin' diesel back !!!!http://www.dieselplace.com/forum/smileys/Cry.gif

Bill

Aug 23 and still waiting on the correct hose. Did get a rental upgrade to a GMC Yukon 3 weeks back.

This is starting to get funny ... GM is on my svc mgr's case for the amount of time I've been in a rental ... he says he puts it back on them that mine is torn down and where's the parts?

I don't know whether to laugh or cry or .... (say, HOOT, how's that Ram A/C doing?)

http://www.dieselplace.com/forum/smileys/Confused.gif

Had mine in today for the first time for an unrelated issue. Handed him the TSB I printed from here &amp; he told his tech to not check anything. He went to order the parts to fix it. He said they will be in by Thursday, I'm not holding my breath.

I had mine in 2 weeks ago, and they ordered parts. I stopped by today and was told some of the parts are on National Backorder. I was told it may be another month or more. My parts were supposed to be in last week. They did lower the amount of freon, and it did help a little. Driving at highway speeds it will keep it fairly cool. I went through 100 degree weather in Nevada in July and it wasn't real cold but it was bearable. But driving around town is a differnt story!!!!!!!


MikeEdited by: BIGMoe

Well, I got mine back last nite. They put all of the old parts back in and recharged the system. Same as BIGMoe indicates ... svcmgr told me that parts wouldn't be available until maybe mid to late September. Looks like GM wasn't quite ready to release the TSB if there weren't parts in the system?
Bill

Same story here, parts on national back order, but I didn't get any kind of date from my SM, or the parts guy...http://www.dieselplace.com/forum/smileys/Confused.gif


Well, at least the weather has been inordinately cool around here for the last several weeks...http://www.dieselplace.com/forum/smileys/Approve.gif

keep your hopes up i just got my parts in at the dealership today but it might be awhile before it gets done since i work there anyone that comes in the door for anything gets taken care of first which sucks but it's kinda understandable but it's supposed to be 90 out tommarow

Dealer replaced my accumulator per TSB about a month ago. Performance of A/C prior to replacement was better than no A/C, but if I drove during upper 90's or left it parked in the sun, forget about it. Couldn't keep up or recover. I would describe the system now as "adequate, but its not going to freeze anyone's bones off ". I'm still waiting for 106-108 degree days here in Sacramento, though.


Jeff


'04 LLY Crew cab 4x4

Which TSB?


There was one about replacing the accumulator with Sub parts, one about reducing the freon charge (or R-134 or what ever it is now) and something about too much oil in the system.


The TSB we are talking about has a different accumulator, a hose, a heat shield and bracket of some sort and was just released a month ago, July 27, 2004 IIRC...http://www.dieselplace.com/forum/smileys/Ermm.gif

My hose finally came in last Thursday and my saga ended yesterday when dealer installed (according svc ticket) TSB # 02-01-38-007b.
TSB # 02-01-38-007C wasn't mentioned ... I don't know the difference.
Bill

Well I got mine back from the stealer with the TSB accomplished.


It did make a difference but you're not going to make any icicles in there. Left the truck sitting outside in 90 degree weather for about an hour, and then drove it. Cooled off pretty well within a couple of miles and eventually made it uncomfortable for me since I was only wearing a T-shirt and LEVIS (That's for all you smart*ss types out there.http://www.dieselplace.com/forum/smileys/HiHi.gif)


So it's worth the trip and waiting for parts, only took about two weeks for the parts to come in even tho they were on backorder when I took it in the first time.Edited by: Zeeb

How do you know if your AC is working "the best it can" or if you need that TSB? Are the "affected ones" not cooling at all so basically blowing warm air or ???

bigdog, If yours wasn't working right you would probably know it. Mine will cool around town until it gets about 90 then it kind of cools but not enough. Driving at highway speeds through Nevada in July it was 103 mine kept it almost comfortable. To compare it my wife has a 2003 Tahoe, it will freeze you out when it is above 90 in town if you do not turn it down. My Duramax has to be set as low as it can go just to cool a little bit. Both vehicles have the dual confront controls. Edited by: BIGMoe