How do you change the headlamp in a 1999 Acura TL. Do you need to remove the fron bumber cover

Nick, To see how headlight bulb is changed, check the attached links,instruction and guides, Good luck
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Replacement How to replace install fix change hid head light ballast...
Headlight Change 1999 2003 Acura TL 1999 Acura TL 3 2L V6
Acura TL Headlight Replacement WITHOUT removing the bumper

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Special Tools Required

02 sensor wrench, Snap-on YA8875. SP Tools 93750, or equivalent, commercially

available.

Image

1. Disconnect the primary 14025 4P connector (A), then remove the primary H025 (B).

2. Install the primary H025 in the reverse order of removal.

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The expansion valve is located within the passenger compartment, driver's side. You need to remove a white plastic piece, called a pipe cover. Once that is out the way, the expansion valve is hidden behind the large, rubber covers. Cut the zip ties to get to it.

I will be working on my CL and keep you posted on what to do.. shouldn't need to remove the bumper.

http://www.acuraworld.com/forums/f47/2001-tl-headlamp-replacement-procedure-92343/

there called hubs / you can get either premium or jobbers .and you need to undo the big nut that holds the axle in . not a small job

If you do not have a sealed beam assembly, then remove the four screws on top...when the headlight assembly comes out unclip the harness from the bulb assembly. Pull the bulb out and replace...don't touch the halogen bulb with your fingers...just the plastic base.

what do you need? bulb size?

To change cabin air filter on Acura TL firs time you need to open the glove box and then remove the arm that holds the glovebox. Press the 2 sides of the glovebox to take this out like in picture bellow.
Acura TL 2004-2010 cabin air filter location
After do this you can see and locate the cabin air filter housing cover.
Acura TL 2004-2010 cabin air filter housing cover
Push the 2 tabs from the filter frame to unhooking from the housing cover. Take the frame out and replace the old cabin air filter with the new one with the air flow indicating arrow pointing down.

Acura TL 2004-2010 reinstal the air cabin filter

you need to run the car and see if the fan comes on if it does change the thermostat and gasket if it does not you need a fan sensor