Need insight on three separate issues..

Hi all, fairly new here and was planning on taking the car to the dealer for three seperate issues. It is a 92 AWD. I tried searching for these but nothing fruitful came up:

1. Starter issues - when i turn the key to the start position, the car clicks (i.e. solenoid moves) but starter doesnt turn. The unit was replaced with a reman in september, and it mostly worked from the first try, but alot of times i need to have a third or fourth try before the engine would start.

Now the car needs perhaps 10+ attempts before the things gets going. The dealer said it could be the aftermarket alarm system (clifford) that has a remote start. We disconnected it from the staring system completely, and as i suspected there was no improvement.

Has anyone had this annoying thing happen to them? I'm goign in to get a free enw starter because I'm pretty sure its a bum unit, but is there any other possibilities?

2. A/C issues - the cooling seems to work on a mind of its own. As in it will pump out cold for maybe 5-10 minutes, then hot hot air for 20 minutes. The system is on auto and the temp is set to 65 btw. Truely a jeckyl and hyde story. Driving me nuts too. Anyone have this experience? Is it one of the three temperature/light sensors gizmos the controlling "auto-amplifier" uses?

3. AWD issue - this one kinda worries me, but it very well could be nothing. Yesterday I was switching out my snow wheels/tires and putting on my summers when I noticed as I was doing the rear, I could spin the wheel with the other side on the ground...i thought the rear diff would require the other side to spin in the opposite direction (at least thats how it was on my ex-impreza), and so there was no way you could rotate one wheel at a time.... Is the system on this car that different? Or is my diff dead?

Please help me out, if you have any insight, I would like to know it before I let my scooby go for a couple of weeks at the dealers...and maybe, just maybe you can help make its stay over there shorter

Thanks in advance

Bassem