I was doing some work on my random misfire issue. There's quite a few hoses that must be removed/disconnected to get to the bank1 side. After putting it all back together, my AC dos not blow cold anymore. Worked fine before I tinkered with it. Thinking that maybe I have left off some hose etc but as far as I can tell, everything is back on and secured. Any ideas as where to start? Thinking about buying a recharge can and running through the system, but other than that I have no clue what to do....

Hindsight here ,20/20 ver.1 is ALWAYS take photos of this sort of thing , even probly useful on your continued efforts to fix , snap pics every step of the way from now on , ya just delete the junk later ?
As far as Relying on pictures from FSM's - hell some lately look like Kindergartners drew them

I took pics along the way. Otherwise no way I could have put it back together. I am 99% confident everything went back the way it was....

Does your compressor engage when you turn AC on?
I would start by checking fuses and then move on to see if you still have a plug on the AC pressure sensor.

yes, the compressor engages and all seems to be working except the warm air coming out the vents.

Maybe debris got inside a hose or into a "nipple" on an actuator - whatever - that is disrupting vacuum signals which align the "climate control doors". If you check that out , you may come across a hose you thought was secure and but fell off from you being in tight quarters - a lot of rechecking , but kill two birds with one stone here.
You have mentioned HOSES , yet I believe most late models utilize electric motorized actuators ? Just a
curious "mention" , I don't specifically know your car.

If the compressor cycles on and off normally, but you get warm air, then try to turn only the rear AC on and see if it blows cold. If it blows warm too, then you'd need to check the heater valve. It should be closed when AC is on. If the rear blows cold, then like macgiver wrote, check if the mixer doors actuate properly.

I will try checking front vs rear. Good tip! As far as 'hoses' comment, a lot of rubber pieces had to come off to gain access to bank 1 coils. That was my first thought since AC was fine before I did this work. I don't know if anything that I unplugged has to do anything with the AC system. I will wiggle all of them and see if hey are tight.
I plan to also run the AC dignostics as per the FSM. Looks like nissan has a pretty good self diagnostic system in this van.


thanks again.

I checked the front vs back AC and confirmed it blows warm through all vents. I also tried to run the onboard diagnostics but I'm not savvy to decipher the results.....

Are the heater pipes to the front and rear heater hot to touch when you expect the AC to be on?
Are the evaporators cold?

Freon "somehow" escaped after your re-assembly , enough gone to come out Warm/Hot @ vents, yet still enough "residual" to enable compressor . (Lo-press. Sw. not activated). Because when full , the Higher system pressure comes out relatively fast , then leakage wanes when getting Lo. Is what it is ? Your leaking,has settled and system is at that "magic # pressure" ? O-rings , comp. seals can "relax" at that "magic pressure" and almost COMPLETELY STOP LEAKING of any real significance !!

mac
I don't think it's low freon problem. I tried to run a can of it into the system and it wouldn't take any, showing it fully charged.

far
Could you elaborate more on where/how to check these?

There can't be low freon situation where AC cycles but there is no cooling. The AC stops engaging first while there is still at least some cooling.

The heater hoses and lines can be found under the hood going to the firewall and under the car where they are in the same unit with the AC lines. And there would be a heater valve somewhere under the hood near the firewall. Check to make sure that the valve closes in AC mode and that all heater hoses are cold in AC mode, while all evaporators are cold. There can be only 2 scenarios: your AC is not cooling, or it is cooling but the heater is also on and fighting with the AC.

Thanks, I will try to diagnose further over the holiday weekend.

I did some more troubleshooting with a manifold gauge. It looks like I had a very low pressures and based on the symptoms I needed more charge in the system. I have added a can of refrigerant and another half a can of the refrigerant with dye as I believe ther has to be a leak somewhere. Once the pressure got up to normal cold air started blowing. I still have to run a UV light to see if and where it is leaking but I think I got it almost figured out.

Yup .

Glad it was that trivial. Too bad it took so long.

too bad, but I have learned a lot along the way, so not completely wasted time. Got me some pressure manifold gauges as a result so I'll be ready for a next one.

Got the van to a shop for a state inspection and was failed for the worn out wipers....I told them I think I can handle the replacement...