Replace fan belt 2009 biuck enclave - 2009 Buick Enclave

According to Wikipedia, 2009 to 2013 are the same transmissions

In its first year of production, the Enclave was often criticized for its 6-speed transmission, which was "hesitant to downshift."[7] For 2009, though, the powertrain is regarded as more competent with more abundant torque. For its entire production, it has been regarded as too heavy, weighing nearly 5,000 pounds (2,300 kg) with all-wheel-drive. Buick's VentiPorts have reappeared at the Enclave's introduction, a styling feature unique to Buick dating back to 1949.
Initial sales of the Enclave have been very strong, with demand far exceeding production capacity, forcing GM to add a third shift to the Delta Township plant.
With the arrival of the Buick Envision (which is slotted between the Enclave and Buick Encore) to North America in 2016 (for the 2017 model year), the Enclave will be bigger after Envision's debut, and the 2017 model year Enclave will be the last under the first generation platform.

no compression at the right time
check for broken timing belt/chain
have a compression test for valve faults
check for correct firing order

Stop by a quick lube shop and they will show you.

On the internet in many places

Timing Belts come with instruction booklet
or a diagram on the belt sleeve

Try You Tube Video

I see more on a timing chains than belts

I have no idea what GM 3.6 motors have belts
or chains,seems mostly chains

Cabin air filters were not available on 2008 and 2009 models.

You find here (website Autogenius.info - link below) - information about fuse box, location and description for Buick Enclave - 2010

http://www.autogenius.info/en/buick-enclave-2010-fuse-box-diagram

per Gates Rubber Co. website, this is the routing diagram for a 2009 Buick Enclave V-6 3.6 L engine (i had to create an image from their book) the circle numbered 1 OR 2 will be the tensioner that you will need to release to get the belt on ( you can usually use a ratchet with a short extension bar or socket to grab it to turn it away from the center) try VERY hard not to gall or damage the pulley or you will HAVE to replace it.

sounds like you got a bad bulb. turn the blinker on an step out to look at them. there should be a blown one.

Read the owner manual. Note that 2008 & 2009 manuals have incorrect information. Locate 2010 Enclave on internet. It has correct description and bulb number. Bulb is a 7443, NOT a 3157.

behind the passenger seat under a floor panel