Ok on my 02 Duramax when it is hotter than 92 outside my ac just sucks. It doesn't blow very cold. But when it is lower than 88 out side my ac is ice cold. what it the deal with that?





Thanks.Edited by: dmaxsnoopy

I believe there was an issue with the Low Side Pressure Switch. Have the dealer look up your vin and see if it has been recalled.

i think everbodies sucks

Like rickles04 said everyone's suck, GM is supposedly coming out with a fix. I heard that last September, still waiting for them to do it. Do a search for weak AC, you should be able to find a lot about it. I for one wish thet would hurry up!!!!

My '03 is the same. In fact, last week when it hit 97 it completely failed, the compressor wouldn't even come on. Parked it for several hours and it has worked again since. It is adequate with temperatures in the low to mid 80s but beyond that it just won't cool. And I just hit 15000 miles, still under warranty, but summer hasn't even peaked here yet. I've got to get it fixed, if some dealer knew how...


2fast2

My Dad's neighbor's '02 truck had a vibration that only his wife felt from the front passenger seat. Turned out to be the compressor and was promptly warrantied. Don't recall if he had a cold-air issue but I believe so.

As others have stated WE ALL HAVE PROBLEMS WITH THE A/C. Above 80 degrees they get progressively worse. we all need to bug the General to get some relief before the warranty runs out !!

Crashdummy. It doesn't look like the General really cares, one would think if they told the Techs there was a problem last fall they would of got on the ball and figure out how to fix the problem. From what I have read it is a accumulator problem. Click Here (http://dieselplace.com/forum/forum_posts.asp?TID=1344&KW=A%2FC) See what GMCSID said about the problem in October.

dmaxsnoopy and all others with AC problems,


Do you have the Recirculate Switch On?


It helps cool the interior a lot more because it keeps the exterior vents closed and then your just recooling colder interior cabin air.


If it's Off your sucking in hot exterior air and trying to cool and dehumidify that. Which is not so easy to do on a really hot day.


And if it gets cold enough inside and you want to regulate the AC system down do it with the Fan switch and not the Temperture control knob, which actually add's hot air from your heater to the air mix.


And everyone should see if there was a recall on their Low Pressure Switch.


My wife's 03 Trailblazer had the same AC problems. They changed the switch and all was good with the world again. http://www.dieselplace.com/forum/smileys/Big Smile.gif


http://www.dieselplace.com/forum/smileys/Rock On.gif Diesel Dragon http://www.dieselplace.com/forum/smileys/Cool.gif

Are you guys putting new filters in at least once a year??





Mine will not cool good when the filter is dirty. Change the filter and it's cool again.

There aren't filters on the 2003 and 2004 models. Wish there were.

There is a TSB on the A/C They lower the level of Freon. I had mine done and it works great. Even at 104






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I have seen that TSB, they are doing it retroactively on a lot of models too but I think it is a bandaid on a bigger problem. R134a is not the best "freon" in very hot weather and high under hood temps prevailent today. Its pressure rises sharply with these temps and can cause high pressure cut off switch to kick compressor out and the reduced charge is a "fix" of sorts. The problem with this solution is that the compressor suffers when less freon is present because it is cooled by the return flow which will warmer overall because the gas reaches full expansion sooner in evaporator to cool it a bit better. They need a better long term solution here. My 2000 K3500 OBS has never had any cooling problem since I got it new and it has seen upper 90's and I rarely use recirculate. Edited by: snoman

Go To LLY forum and look under A/C problems. A tech from a dealership in Texas said they put to much oil in the system and the accumliator fills up with oil, I drained the oil in the accumliator and I now blow 40-50 below outside temp. There is a new accumilator being built for these trucks, it has been issued a part number and will be at dealerships soon. Three main things to check, there is a tsb on 03-present for a bad batch of compressors( see GM techline Dec 2003 issue) that deals with this. Bad low temp cutoff switches which allowed 134a to leak out of the system, or to much oil in the system. Stay on the dealer about it!!

Off hand (&amp; professionally speaking), I would say that there is not enough refrigerant in the system. r134a is a good refrigerant (similar to r-22) &amp; it works fine at conducting heat away (it's 'boiling point' is about 30 below on the farenhiet scale) in autos. With a thermometer in the center ducts, doors closed &amp; a/c on re-circulate, temp should read around 50-55 degrees at the duct, minimum, within a few minutes, regardless of outside temps. Of course rolling down the highway, your inside temps should reduce sooner as heat is being transfered more quickly from the condensor allowing for faster heat transfer inside also. However, to reduce the likelyhood of evaporator freeze-up, it will only get so cold (42 degrees at the ducts max-in my experience), which should be good enough to hang meat by FDA standards.


I have seen a number of 2002 GM trucks with this/your condition (including my own), &amp; mostly there has been a leaking-faulty a/c compressor to blame, look for tell-tale oil spots under, on, or around the compressor.


hope this helps you out.....

Is there a recall number that can be referenced when I'm at the dealer.The service advisor said he has not seen anything from General Motors related to the a/c.

Thor,

There is no "recall" that I am aware of. There are some service bulletins. The one covering the poor a/c performance of the 2003 and 2004 models is 02-01-38-007A. This is mainly a band aide fix prior to the upgaded accumulator. You can find a copy in the TSB section.

The upgraded accumulator for the late model trucks has just come out and my dealer said there is a new service bulletin for it. However, he must think he is a CIA agent, and wanted to keep the details (such as the number) secret. There is a request for the number in either the the TSB or Tech topic, but as of yesterday, no one has posted it. I hope one of the Techs will ultimately post the bulletin in the TSB topic area.

I think there is also a bulletin on a faulty pressure switch, but I do not recall seeing it in the TSB section.

Go to the "Second Generation Duramax LLY" topic and look for a thread titled "New truck - A/C not working good". The second page has a post listing the part numbers for the new accumulator and hose. That should get your dealer going (assuming you have a newer model truck). My dealer is still waiting on the correct hose to arrive.

Stay cool!

my dealer has orderd the accumulator and related parts to fix mine sometime soon. didnt ask him the tsb number, was just overwhelmed this mught solve it. will keep you guys updated. was in once before for freon charge..later, bc

BH IN AZ Thanks for the information... I have an 04 dually,stock. Please keep us posted at to how the repairs help.

My air blows actaully, and pretty cold at that.http://www.dieselplace.com/forum/smileys/Cool.gif


Am I the only one that thinks the air is fine? Even when its 90 out it blows cold. Maybe I'm just lucky. 03 reg cab with the non auto temp stuff, maybe thats the difference?

My dad's AC 03 had poor perfomance also. Low side pressure switch fixed him. Of course its not terribly hot in WY this year, but it was intermittent cooling. Now the one I have in my 02 D/A keeps the Phoenix, Arizona summer at bay, even in the 112+ days we have had out here in the SE Valley. Love mine, never a problem.

For what it is worth, it is a lot easier to cool 110 degree air with 20% humidity tops than it is to cool 95 degree air with 75% humidity. taken the water out of the air takes a lot of cooling energy.

My 04.5 lly's AC is poor, outside air over 90, you need recirc on and its still not very cool.. outside air ~mid 80's works great?


JJ

My 04.5 lly's AC is poor, outside air over 90, you need recirc on and its still not very cool.. outside air ~mid 80's works great?


JJ

TSB 02-01-38-007C. Seems to have helped mine. Will give a real test this weekend. Search the TSB section for the TSB.

JimEdited by: jholly

My dad's AC is failing again in warm (90) weather. He goes back this week. tech said "too much 134?" Jeez I hope its that simple.

Man, in my 2004 LB7 I can hang a side of beef in my cab, and it would remain frozen . . .


I guess I am one of the luck few . . .

Mine goes in tomarrow for the TSB, parts finalyhttp://www.dieselplace.com/forum/smileys/Confused.gifgot here. Perfect now that it's cooling off, it was only 105* this weekendhttp://www.dieselplace.com/forum/smileys/Approve.gif!

All that heat must have addled your head Brandon. 105 is cooling off? Good God, man! I'd die within minutes. . . . http://www.dieselplace.com/forum/smileys/Big%20Smile.gif Must be a dry heat.


Dennis

new acumulator fix hasnt solved the problem...only about 80 today and not cold enough out the vents..even on recirc...will be going in for a third round..later