No. With the A/C button off the compressor won't come on, it will just give you ambient air. With the A/C button on, the compressor should run constantly as I described, regardless of whether it's in Auto or not. The swash plate basically makes the compressor "variable compression", so it will only move as much freon as it needs to in order to keep the evap cold. That means it never needs to cycle, it just adjusts the swash plate according to the evap temperature.burrpenick wrote: ↑Fri Jul 23, 2021 5:59 pmPS: My WIFE says we should not push the a/c button on, but just leave it on AUTO and set the temp. Is that correct??? Today, I tried any and all combos to get some cool air, nothing worked
If they have a good sparky they can. Frankly, a lot of guys still don't get how the systems work and make a lot of wrong repairs. By and large, the technicians have a problem more frequently than the cars. The only teething issue on the gen2's was uneven left/right temperature on the Auto systems, and that was resolved by the end of '15. The '21's are having a lot of weird issues and that's different, but the gen2's are actually fairly bulletproof. There are simply a lot of HVAC-dummies out there that don't understand them and don't do proper diag.
That was on the VStar, it had 106K on the odo when they swiped it. On the original pistons, great bike. I guess the thieves thought it had 6K, ha-ha on whoever bought that motor. I have about 350K lifetime.burrpenick wrote: ↑Fri Jul 23, 2021 8:34 pmOK, I knew that was a Yam......but 100K miles is a bunch on a cycle!
Did you give him the diag stuff I gave you? If you did, it would hard for him to not find the problem. The clutch either spins the compressor and has power or it doesn't, no rocket science needed. Things only get complicated if it doesn't spin when external power is applied. So this is sort of a "why didn't he know better" situation.burrpenick wrote: ↑Wed Jul 28, 2021 8:56 amBad news, a new compressor did not fix my '15 Rogues a/c! The shop told me going in that it may not - and he offered to pull it back off. He now thinks its an HVAC ECM issue and that he cannot work on that, thinking I'd need to take it to a dealer. Ideas?????
Nope, the compressor clutch on a Nissan is dumb as a post.burrpenick wrote: ↑Wed Jul 28, 2021 8:56 amSomeone mentioned a new a/c compressor on a Dodge that had to have the computer re-flashed before it would work. Anything like this on the ROGUE? New compressor, but it still won't cool? Thanks!
The wife is right, the compressor should spin as soon as the A/C button is pressed unless the HVAC Controller or ECM vetoes the command. The ECM will only veto it for refrigerant pressure over-under, or for wide-open throttle or a hot engine. The HVAC will only veto it if one of the three sensors reads below 33°F (I think) or if the blower is off. That's why it isn't rocket science, all of those things can easily be checked with either a voltmeter or a jumper. Lastly, the HVAC Controller (officially the "A/C Auto Amp") is the last thing you should suspect, they fail very, very rarely.burrpenick wrote: ↑Wed Jul 28, 2021 2:32 pmI was afraid of exactly what you said, but was kind of in a bind here in a very rural part of NC. Just tried to call, he's gone now, but I'm thinking it didn't spin. He had verified that it had power, so he was just thinking something inside it was shorting. But now the complicated part starts - I know there is a HVAC ECM and that maybe it operates the various switches/dials on the a/c controls. That does make me think about how our controls seemed to work some and then not. We experimented with the auto a/c button, etc, but it was random. My wife was confused after reading the manual about the a/c button, but I FELT it should be on to energize the compressor, in any mode it was in. Appreciate your wisdom and maybe you can guide me some before I take it to a dealer that is an hour away. And I don't want to drive my '72 Nova there and back since it will probably have to be left overnight. George