2004 6.0 NV4500 Tahoe

[Dantheman1540]

Don't think it's the tune since I reverted way back to one that is known to have AC with no issues.

Its had E fans since forever and they are set to come on pretty early so the condenser stays cool. Also I have confirmed they are on when the compressor is not.

The compressor only comes on when manual activated using HPT. If I close HPT or disconnect my laptop the compressor immediately shuts off even tho the ECU is showing that the AC is being requested.

Idk that mine has an interior temp sensor besides the one on the dash for the mirror temp readout. Mine is super duper base model and just has the sliding dual climate control, no auto temp set stuff.

I'm thinking its possibly the temp sensor which I can test or shotgun replace for a few bucks. Other than that I'm not sure at this point, maybe look at the fuse box and check some relays or something.

I really dont feel like messing with it for a few days, so if anyone has good ideas on things to test I'm all ears. Gonna enjoy Japanese climate control for now.

 

[iamdub]

What in a tune shuts off the compressor? X amount of throttle input? X amount of RPM? X coolant temperature?

I'm wondering if you have something in the tune turned off (or on?) or scaled in such a way that it's disabling the compressor, like a failsafe.

 

[Dantheman1540]

What in a tune shuts off the compressor? X amount of throttle input? X amount of RPM? X coolant temperature?

I'm wondering if you have something in the tune turned off (or on?) or scaled in such a way that it's disabling the compressor, like a failsafe.

The only thing I know of is a cutoff dependant on throttle position which mine is set to shut of at 90% and reactivate at 35%. Then there's the RPM cutoff which I have set to shut off at 4,750 and come back on at 3,500. Both of which have been set at those exact settings for well over a year. There may be another way to deactivate it but if so I'm not aware of it. I've tried searching for "ultimate ac settings" in HPT before thinking there was some minor hacks for optimum ac or maybe even guidelines on whats considered safe or not but I can't seem to find anything.

 

[randeez]

no ac pressure on your years?

 

[Dantheman1540]

Yeah there's an ac pressure sensor in the drier, I replaced it last time the system was open since I replace the drier everytime. I'm leaning towards it being that sensor so I guess I'll order an OEM one instead of a jing gong goy one like whats in it now.

 

[pwtr02ss]

Does seem more like a sensor issue than tune.

 

[Dantheman1540]

$40 for made in Mexico quality!

 

[randeez]

no i meant, can you log the pressure?

 

[Dantheman1540]

no i meant, can you log the pressure?

oh uh yes but no, instead of showing a pressure reading it just shows voltage from 1-5v. I suppose I could change the parameters to readout psi but I'm not sure what algorithm I'd use. I suppose if its showing voltage that might tell me something as well, here's a snippet of when I had the compressor manually turned on with HPT.

 

[randeez]

lol
yea my bad didnt realize thats all you had to go on. dont know that doesnt really tell you anything.
log it koeo, running compressor off, running compressor on, unplugged and see what voltage it shows for each to get an idea.
in my truck you can just log the pressure reading from the sensor - recently had a sensor just showing 100psi when i completely removed it from the port

the range on it is like 0-500psi i think so it may think the pressure in the system is high af

 

[Dantheman1540]

lol
yea my bad didnt realize thats all you had to go on. dont know that doesnt really tell you anything.
log it koeo, running compressor off, running compressor on, unplugged and see what voltage it shows for each to get an idea.
in my truck you can just log the pressure reading from the sensor - recently had a sensor just showing 100psi when i completely removed it from the port

the range on it is like 0-500psi i think so it may think the pressure in the system is high af

Yep pretty terrible options for diagnosis lol. Here is a log with the AC off and the pressure changes, also as the log moves its obviously sensing pressure changes and the readout changes .xx so I don't think the sensor is bad according to this log. However, this log is a week or so old I hadn't been saving logs lately.

 

[randeez]

the sensor in the drier is the low pressure side of it, is there another sensor between the compressor and condenser?

 

[Dantheman1540]

the sensor in the drier is the low pressure side of it, is there another sensor between the compressor and condenser?

Yes I think theres one down by the compressor, come to think of it I think I used to have connectors on it to run my widebandbecause I was to poor for the pro edition lol. I guess I need to check that

 

[Dantheman1540]

Checked on the Tahoe at the exhaust shop today, it's been there all week and to progress looks great but I have no pics of it yet because my phone is trash. I mentioned how the yoke has been hitting the frame and that I had adjustable UCAs on the way. He thinks it's not so much a pinion angle problem but a lower control arm problem. Basically since its lowered they lose the leverage they have on keeping the axle from rotating.

I remember seeing a kit that may have been discontinued that's essentially relocated the rear LCA mount and I believe it was bolt on. Anyone have any leads it?

 

[randeez]

 

[iamdub]

Checked on the Tahoe at the exhaust shop today, it's been there all week and to progress looks great but I have no pics of it yet because my phone is trash. I mentioned how the yoke has been hitting the frame and that I had adjustable UCAs on the way. He thinks it's not so much a pinion angle problem but a lower control arm problem. Basically since its lowered they lose the leverage they have on keeping the axle from rotating.

I remember seeing a kit that may have been discontinued that's essentially relocated the rear LCA mount and I believe it was bolt on. Anyone have any leads it?

2000–2006 Avalanche, Tahoe and Suburban Rear Lowering Hardware Kit

Secure rear height setup on 2000–2006 Avalanche Tahoe Suburban with hardware designed for strong fastening and dependable suspension positioning. Shop now.

djmsuspension.com

 

[Dantheman1540]

View attachment 304840

No no to much munies, I is pour.

2000–2006 Avalanche, Tahoe and Suburban Rear Lowering Hardware Kit

Secure rear height setup on 2000–2006 Avalanche Tahoe Suburban with hardware designed for strong fastening and dependable suspension positioning. Shop now.

djmsuspension.com

Thank you thats exactly what I was looking for! Anyone have pictures of the kit installed other than the black and white ones in the DJM instructions?

 

[iamdub]

Thank you thats exactly what I was looking for! Anyone have pictures of the kit installed other than the black and white ones in the DJM instructions?

On my GMT900, but is pretty much that same on yours: https://www.tahoeyukonforum.com/threads/growing-up-doesnt-have-to-suck.93510/post-1395646

 

[Dantheman1540]

On my GMT900, but is pretty much that same on yours: https://www.tahoeyukonforum.com/threads/growing-up-doesnt-have-to-suck.93510/post-1395646

Wow that moves the LCA down a ton! Might just fix my pinion angle problem at the same time too. I do hope theres no difference in the brackets for NBS and NNBS because I forgot my axle was from a 2011. Doubts theres a difference tho.

 

[iamdub]

Wow that moves the LCA down a ton! Might just fix my pinion angle problem at the same time too. I do hope theres no difference in the brackets for NBS and NNBS because I forgot my axle was from a 2011. Doubts theres a difference tho.

I think there is a difference in that whole shock mount/LCA box thing. You'll find out soon enough!

FWIW, I haven't noticed any vibes from bad driveline alignment. Not saying there aren't any, though.