Here's a story: My friend was having some problems with his '03 Nissan Pathfinder. See, the air conditioning system on his old (well, relatively old) SUV was usually acting up. The AC was turning on and the blower was also on, so we suspected something was up with the fans.
I asked him if he still had his ride's user manual so that we can check the layout and possible troubleshooting info. The bad thing is, he had misplaced or lost the darned manual when he moved to our town a couple of years back.
So I took my laptop and got my browser open, and we proceeded to search for some information on his car's air conditioning system. We Googled and Googled until we came across this site with a lot of vehicle-specific manuals in PDF document form. Some even addressed specific issues or had particular system information.
Right there, smack on the first page, was information on the fan control amplifier of a 2003 Nissan Pathfinder. While we still didn't know if the fan control amplifier was at fault, it was a start. We can start performing some diagnostic tests on the system to find out what was causing the AC trouble.
Since we passed the first check concerning the blower motor, we knew we had the proper manual. So we started checking the fan control amplifier's power supply, proceeded to check the body ground circuit, then checked if there was proper voltage going to the amplifier itself. Turns out there were some busted harnesses, and we just swapped them out right after to restore proper AC function.
The Internet is really an excellent source of information if you just know where to look. If you search hard enough, there are online repair manuals that you can find for your specific vehicle make and model.
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