Lew your AC problem

[Ill_Born_SS]

With your Trinity , create a guage>Miscellaneous>ac high pressure/volts> monitor it.
60* outside should be greater than 50 % of 5 volts
75* outside should be greater than 70 % of 5 volts
90* outside should be greater than 90 % of 5 volts

the guage is in % of 5volts so, lets say it is 76-85* the pressure should read high side 179-225psi after running for 5 min. If your number is like 20 while monitoring it would most likely indicate low system pressure and would require a re-charge ( considered normal for a 4-5 year old system) and your system will not start the compressor due low fill pressure.

[06MonteSS]

aaaah... NICE man!!!!!

THANK YOU!!!!

will check that out today on my way home from work.. supposed to be in the mid 70's here today...


so the gauge is in % of 5 volts... so what's it going to show me then?? is it going to show me the psi like you mention?? or would that be 100%... so you're saying that if it shows 20%, then it's low pressure... ??

[mikel]

LOL.

I overfilled mine this weekend and made the compressor freeze up. It was fun. It was 90*. LOL.

I bled out like 20-25 psi of pressure and it worked fine....

[Ill_Born_SS]

It`s going to show you a % of 5v so like the 20 eg I gave, it would be 20% of 5v which is 1 volt and that is like maybe 80psi (don`t hold me to that exactly, still figuring this out) which is way to low using the temps I used.
You should have a number somewhere greater than 50%of 5v.
Also did you check all the fuses related to the AC, (BATT 4,Emission 2/15A,AC Compress /10A,AC Compress Relay, all are located in the engine bay fuse box)
With the key off, remove and tap the relay then re-install, check it for corrosion on the terminals (clean with a pencil eraser if needed)

Mike, yes an overpressure will also prevent it from operating.

and

If you suspect a leak just go over the system with a blacklight. GM installs a flourescent dye in all their systems.

[06MonteSS]

yeah, I checked the AC Compressor fuse, it was fine... the relay, well, ya cant tell by visual inspection... but I did pull it out and all contacts were still perfectly fine... didn't try tapping it tho...

also, didn't know the batt and emissions fuses had to do with it... but I would *think* that if one of those were shot, I'd get a trouble code and/or a CEL... but I'll check 'em anyway...

yeah, when I push the button to turn the AC on, the light is on steady like normal, but, you don't hear anything switching on/clicking over at all...

If you suspect a leak just go over the system with a blacklight. GM installs a flourescent dye in all their systems.

now THAT'S cool... didn't know that!! now I gotta find a blacklight somewhere... LOL

thanks man, all good tips/info!!!

[Ill_Born_SS]

It all get its power from BATT4, then the relay and from the relay it goes to the compressor clutch and the emission 2 ( in case of overheat or cel, automatically shuts the AC down to prevent extra burden on car,(it can even shut off 4 of the 8 injectors to assist with cool down, disable dod and a whole bunch more)
I would say that you are probably just in need for a system service/ topup. The system only holds 1.2 lbs max and I am sure they don`t come perfectly full to start with! GM and their $,02 here and $.04 there, austerity you know!

[06MonteSS]

ok, cool...

I will check those other fuses to make sure...

and then will try to find a black light to make sure it wasn't a leak anywhere... that's what I DON'T want it to be.. then they'll have to take out my CAI setup and everything to get at the lines... uugghhh...

[06MonteSS]

k... monitored the ac pressure (psi) and also the one for volts...

the one with the volts, was showing 21-23% of 5 volts....

and the parameter for the psi, was showing about 83 psi....


so, it sounds like just a recharge is needed... WHEW!!

cuz if it was due to a leak, there'd be no pressure at all, right??? cuz there'd be a hole and everything would be out of the system and no way to keep pressure in...

[06MonteSS]

Thanks Ill_Born!!!

[Ill_Born_SS]

Yea Lew, really glad to help!
You are correct about the location of the gauges, I edited the first post so others may find their way and the AC pressure find by you is also an extreem bonus...

This Trinity is one great little contraption!

[WoodburyMan]

Ooooo. Nifty.