4
Using a higher octane fuel should not have caused the SES light to turn on.
The only fill-up-related thing I can think of which would cause the SES to turn on is if there is a bad batch of fuel (something like water). In such a scenario, the SES will be triggered due to the engine knocking. This would be typified by engine sputtering, and is usually ...
2
No negative consequence. Some manufacturers do this because the A/C unit also acts as a dehumidifier so running the A/C helps dry out the air in humid climates. In some areas, at some times of year, you run the A/C while running the air with a temperature set somewhere in the middle, instead of full-cold. This is to prevent window-fogging. This is common ...
2
Mixing octanes in an upward-direction is fine. But, not completely tightening the gas cap could cause that. If you want to know exactly why the CEL came on, just take the vehicle to a retail car-parts store, such as Autozone or NAPA. Most of them will pull trouble codes for free.
(You mentioned gas cap above, but your wording in that sentence is ...
1
Those two systems are not linked.
Perhaps an a/c pipe was corroded and finally broke when you closed the hood for example.
This sounds like coincidence, but you will need to fix it.
1
Your best bet is to back probe the yellow wire to see if it's the one you need. I have used a needle attached to an alligator clip on a wire as my probe mechanism. Works pretty slick without damaging anything. Just set the emergency brake before you do anything.
1
First off, you don't specify if your vehicle currently has power locks or not. If it does, you don't need a kit like you listed. Something equivalent to the Viper 211HV would be enough. Since you mention a kit with actuators included and the Versa is certainly a common car to come without power locks, we'll look more into specifics for adding actuators.
To ...
1
Your statement that "no air comes out at all" to me indicates that the blower/fan is not working. This could be a problem with the blower switch/speed control, the blower motor, the associated wiring, or a fuse which protects all of the previous.
I would remove the blower (often accessible from the engine compartment, on or near the firewall) and test it ...
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