ACTION NAPA AUTO CARE - (Page 35)

Case study: 1999 VW Jetta - A/C fuse T echnicians working on a third generation Volkswagen Jetta might find their A/C controls totally inoperable, including no blower fan operation amongst any of the fan speeds, and no operation of the A/C button or recirculation button. Even the backlights behind these buttons may not illuminate. A possible cause could be similar to what was found on this 1999 Jetta. Fuse # 25 is listed as the "Fresh Air Blower, Clima- chanical refrigeration circuits. I went right after the fuse panel in the driver's door jamb to inspect the fuses. Before going all out and testing every fuse in the panel, I decided to look up the fuse function arrangement in my service information system. When I found the right chart, I printed out those pages, and using a yellow highlighter, marked all the fuses related to the A/C system. That way, when I took the pages out to the shop to start my testing, I knew exactly which ones to look for. I even highlighted their colors and positions in the panel to make identification easier. The nice thing about taking this extra step is that you can save time by not testing unrelated fuses, and go right to the potential problem areas. Operator's control panel for this '99 Jetta has ON/OFF buttons for both A/C and Recirculation. tronic, A/C" fuse, but actually powers most of the A/C control panel as well. When this car came into the shop, the "AC" button on the controls would not light up when depressed. Since the vehicle was recently in for service, and the system was known to be in good working condition, I figured it had to be something other than the me- The cabin fuse panel on the Jetta can be found by opening the driver's door and removing the access cover. Turns out that fuse # 25 was the culprit, and a new fuse took care of this problem. The vehicle owner was happy to again have a working blower motor, not so much for use with the A/C system, but primarily because of the potential safety issue surrounding an inoperable windshield defogger. Taking things one step further The cabin fuse panel on the Jetta can be found by opening the driver's door and removing the access cover. Adding a bit to this diagnosis called for checking the blower motor current draw. After all, that would be the correct way to test the system after fuse replacement and verify it's operating properly. Keep in mind that fuse number 25 was replaced (which is a 25 amp fuse), and I'm not exactly sure why it blew in the first place; the system wasn't working and replacing the fuse fixed it. I normally wouldn't bother to find out why or verify the repair Spring 2015 * ACTION/NAPA 35

ACTION NAPA AUTO CARE

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ACTION NAPA AUTO CARE - Cover3
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