A/C Inop?

[SlyStoner421]

I'm not sure what it is, but after today regardless of t-tops i need to figure out why my a/c doesn't work... the compressor doesn't engage so how do i test for a bad unit? low pressure maybe? i just want to make sure its a bad compressor before i spend a few hundred on one. ill probley rarely ever use it but sometimes its a hazard without it. my engine is practically new so im not sure why it doesnt work, but i do know it sat for a few years before i bought it with the working being done before the sit.


anyone have a working LT! compressor layin around? i think i may go check pressure

[sman]

After searching around forever for one for my monte carlo, I learned they wont turn on if the pressure is low, charged it, had ice cold air. For one day. Then the condenser started to leak.......

[GETGONE]

My V6's AC doesn't work. Was fine last year. If I leave it on AC with the car shut off then turn it on the compressor engages. If it's off when I start the car and try to turn it on, it won't engage. I've already swapped relays underhood to make sure that wasn't it. I'm thinking something's leaking and I need to take it somewhere to have it checked.

BTW..what does a new engine have to do with AC? You can remove the compressor and leave it hooked up in the car and put the new engine in and never touch the AC lines.

[SlyStoner421]

yeah i realized that after i posted. I went down and picked up a recharge kit with gauge. No leaks & holds pressure but still clutch wont engage so i dunno.

the relay is not engaging and I tried jumping it but nothing... hmm

[Virtue]

the system can be low on refriderant but the compressor will still cyle on then cycle right off be cause of the low pressure cutout switch

check the connector on the compressor


if the compressor isn't kicking on you wont be able to put refriderant into the system

im on my way out ill post more when i get home

[lozanoa11]

if i remember right it is controlled on the ground side so see if there is power to the ac clutch on one wire. if there is power on both sides its not grounding it. try grounding it yourself

[GETGONE]

I had already checked the connector. When I start the car with it on an AC setting the compressor comes on and stays on. I would expect it to cycle off if it were low on refridgerant.

[lozanoa11]

thats a weird situation. get the pressure checked out it may be too high. idk i didn't pay attention is a/c class alot. lol

[SlyStoner421]

ill just have to probe my connector at work on monday to see if i have power there... im basically leaning towards bad compressor at the moment, its held pressure all day

[Virtue]

thats a weird situation. get the pressure checked out it may be too high. idk i didn't pay attention is a/c class alot. lol

theres usually a high pressure switch as well .def get a reading at the connector

it could even be a prob with one of the high or low switched

there can be enough pressure for the cut off switch not to work but just insufficent cooling

had a really good class a UNO in ohio

[SlyStoner421]

okay after some investigating i managed to get the compressor to work (to know for sure it wasnt bad I just jumped the low side switch) but now its cycling for some reason. i checked pressure it seems low while the compressor is running, but when the system isn't running its at a normal 40psi ( I know 25-45 is normal range)

so now i can figure out whats going on, the pump is cycling on and off and the condenser isn't getting cold, maybe a few degrees cooler. while jumping the low side switch the compressor will run non-stop...

heres part 2

I listen under the passenger dash and i hear a hissing, something turning on and off... like as the compressor turns off and on. i unplug this black 3pin, 2inx1in box and the a/c shuts off...

I managed to trace the part number as 15-71978 A/C Cycling switch.


I have access to just about any year heating & cooling book and was reading about this black box earlier while trying to get the basic trouble shooting down(I figured I wouldn't need the 1000 page book)

but i know this is a bunch of jumbled up sentences but im just not sure if its the a/c cycling switch or a different problem.

someone have any input on this?

[lozanoa11]

theres usually a high pressure switch as well .def get a reading at the connector

it could even be a prob with one of the high or low switched

there can be enough pressure for the cut off switch not to work but just insufficent cooling

had a really good class a UNO in ohio

not to thread jack but how did you like UNO?

[Virtue]

not to thread jack but how did you like UNO?

over priced, boring place to live NO girls if there is just fattys who chase thugs cause the west side of town is worse then flint/detroit

so wierd hicks down there

i only really associated with my 8 close friends from hs that went there, u learn a good amount its fast paced, not worth 1k a class+ living expenses

[SlyStoner421]

low side switch has continuity so i know its good, im not sure just yet how to test the high side...

pressure goes from 40psi while off to about 5psi while running, on and off few seconds on few seconds off.... hmmm this is gunna bug me

[Virtue]

low side switch has continuity so i know its good, im not sure just yet how to test the high side...

pressure goes from 40psi while off to about 5psi while running, on and off few seconds on few seconds off.... hmmm this is gunna bug me

only 5 psi while running? what are u useing to actually check the pressure on the high and low side?