What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[89Suburban]

I am also wondering if changing the filter in it would be advisable or not.

What filter? The orifice tube?

 

[89Suburban]

You mean you've never changed out your AC fluid! I think the maintenance schedule on that is every 50k miles.... Lol

Never heard of that.

 

[89Suburban]

never had any problem with the ac other than it seems like it just doesn't get as cool as it did 5 years ago, I would just go buy one of those cans and top it off but if any air has gotten in there in the last 10 years I would rather it be done right, had the dealer test it last year and they said it was within spec which really didn't tell me much other than they didn't do anything.

Air can't get into it unless you loose all pressure or have a system failure.

 

[89Suburban]

 

[gooffeyguy]

Never heard of that.

I was joking, lol

 

[Doubeleive]

What filter? The orifice tube?

yes couldn't remember the name of it

 

[Doubeleive]

50 deg doesn't seem all that great, last time I checked mine will go down to 44-46, my 03 used to pump out 36deg so did my 00

 

[Geotrash]

never had any problem with the ac other than it seems like it just doesn't get as cool as it did 5 years ago, I would just go buy one of those cans and top it off but if any air has gotten in there in the last 10 years I would rather it be done right, had the dealer test it last year and they said it was within spec which really didn't tell me much other than they didn't do anything.

From all I've read, the gauges on those cans are a gimmick and it's easy to overcharge the system with one, so I bought a set of gauges, a postal scale and a vacuum pump, and learned to do it by weight, which is what GM specifies. My 2007 Yukon XL Denali w/ rear A/C takes 40 oz. Took me about an hour to do the job - 45 minutes of vacuum, and 15 minutes to charge the system. It was empty due to a leaking Schrader valve on the low pressure port, which I fixed, so I didn't have to worry about recovering the old refrigerant. If it still had the refrigerant in it, I would have taken it to a pro to have the work done so they could recover it for recycling. As the system was charging, I kept a thermometer in the dash vent and once I'd added the 40 oz., the temperature was 1-2º colder than spec.

Apparently, not doing it by weight has implications with these trucks because the compressor sits low in the system, where excess liquid (like having too much oil in the system) will accumulate and can eventually take out the compressor. Dunno how true that is in practice, but it's what I was told by a mechanic friend.

Anyway, I did the job 2 years and 20K miles ago and it's still blowing ice cold with no other problems. This video was the guide I used. Good luck!

 

[07Burb]

I was joking, lol

You think this is a game??? We ain't got time for jokes up in here!!

 

[George B]

Is the consensus to not add any oil unless replacing large parts?