20 Most Recent 2001 GMC Yukon XL - Page 3 Questions & Answers

I think the flapper doors which direct the air flow are all controlled by engine vacuum which is piped through a one way valve (check valve), then into a vacuum resivoir, then to dash. Any leak in vacuum will cause this issue.

It is in the under hood fuse box. flip over the lid of the box after removed and the diagram is right there. good luck!

it is in the under hood fuse box. flip over the lid of the box after removed and the diagram is right there.

In the under hood junction box , fuse CTSY LP 15 amp . Instrument fuse panel PWR WDO CB 25amp . Sunroof Motor Synchronization Synchronization will be necessary anytime the sunroof module battery positive voltage circuit is interrupted. The sunroof module will be synchronized when the controller learns the full vent position. The sunroof system will ignore any open request until the system has been synchronized. To synchronize the sunroof:

1. Turn ON the ignition, with the engine OFF.
2. Using the close/tilt up portion of the sunroof switch, operate the sunroof glass until it reaches the full vent position.
3. Verify that the system operates normally.

Once the sunroof glass reaches the full vent position, the actual position is stored in the memory of the sunroof module. The sunroof module will stop the motor one motor revolution before the defined actual positions Hope this help ! good luck !

Get engine codes read, this should indicate the problem area!

Is the motor running but sun roof doesn't move? Please explain exactly what the issue is.

Defective sensor or the wire connection to it is loose or bad connection.

Without hearing it, I can only guess. Collapsed lifter or loose connecting rod bearing. High miles? Maintenance not done on schedule? That would do it.

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Dunno! How many miles do you have on it? Have you change the fluid before? At what interval.

Well I believe that only upholstery can fix that but the whole seat comes off. What seems to be the problem? It would be cheaper, only if your budget is tight, if you get another one from a pick a part near you.

I would check the freon level, because that would be the cheapest fix. If it's not the freon, it could be the AC compressor. If the compressor is locked up, it could make a screeching noise. As far as your brakes, I'd use some brake cleaner. Most likely (unless you've driven it tens of thousands of miles already) they are just dirty. Dust collects quickly on brakes. Hope this helps!

Should be the same as the 99 http://www.2carpros.com/forum/automotive_pictures/139033_nnnn_2.jpg