I am trying to remove a heater core in a 2006buick lacrosse I have all the bolts but not sure if one is not hiding some where

HI,

Ok, you dont remove the dash or upper dash pad for this job. You remove the lower trim panels underneath the left and right side of the dash, remove the center console if equipped, then pull the front carpet back and remove the air ducts going to the back. Then you remove the heater core housing and separate to remove the heater core

The average cost for a Buick LaCrosse heater core replacement is between $490 and $751. Labor costs are estimated between $457 and $576 while parts are priced between $34 and $175 .

Buick LaCrosse Heater Core Replacement Cost Estimate

..

not knowing the make model and year it is hard to say
however as all cars are assembled in the factory with the heater core already installed , it generally becomes easier to remove the dash to exchange the heater core
talk with a radiator shop or a service center for how to do it

Here's a video on your P0449 code. EVAP Code P0449

You should not have to pull the whole dash. Take the plenum apart, loosen the hose clamps, remove the core.

Your Buick has a heater core o heat the air sent from the air conditioning unit before it is blown outwards. A malfunctioning heater core may cause the coolant to leak on the inside of the car, or It may even lead to smoke blowing out from the air vents.
Replacing the heater core will solve the problem, and to do so, you require a socket wrench and a Philips head screwdriver. Thi process is straight forward, but it may take up to an hour to finish
1. Pop open the hood, lift it, and then disconnect the bettery by using a socket wrench
2. On the passenger side, unwind the four screws from the kick panel which is underneath the glove box
3. Disconnect and remove the kick panel
4. Open the glove box, remove all contents within, and then unmounts the whole glove box by removing the screws
5. Pull down the flange, and you can access the heater core. To open it up - remove the two bolts from heater core cover and lift it off
6. Disconnect the core's wiring harness, then remove the four screws that are holding it in by using a Philips head screwdriver. Now you can easily remove the lousy heater core
7. Install the new heater core, then - reconnect wiring, screws, heater core case, and finally, the bolts
8. Reattach the kick panel and then glove box, and you are done

First check the radiator and make sure it is full....If not fill
check your hoses that go to the heater core to see if they are leaking....Your heater core might be bad which is most likely the case.

Instructions

1. • Drain the cooling system. Draining the cooling system will prevent toxic engine coolant from leaking into the passenger cabin of the vehicle during removal of the heater core. To drain the cooling system, simply disconnect the lower radiator hose from the radiator by loosening the hose clamp and pulling the hose off. Be sure to drain the fluid into a sealable container and dispose of the coolant at an appropriate disposal site.
   • 2Pull the dashboard six inches rearward. In order to do this, you must remove the following parts; the center dash bolt (located under the defroster vent cover), the bolts under the driver and passenger kick boards, the bolt connecting the dashboard to the radio mount, and the the bolt connecting the dashboard to the rear of the glove box. The locations of these bolts are immediately apparent upon looking under the dash. Once you have removed these bolts, you can pull the dashboard rearward and secure it.
     
   • 3Remove the heater core box. The heater core box is a black plastic box that surrounds the heater core. This part should be visible when looking down into the dashboard from the passenger side seat. Remove the two bolts on top holding it to the firewall and another on the bottom near the foot well. After removal of these bolts, the heater core and box are attached to the vehicle only by the coolant lines, which you can now disconnect by reaching into the box and pulling them off of the heater core (you may have to loosen the clamps first).
     
   • 4Install the new heater core. This is accomplished by applying steps 1 through 3 in reverse order; re-connect heater core coolant line, re-install heater core box (be sure to apply silicon sealant to the edges of the box, hermetically sealing it), replace the dashboard and install bolts, and re-fill the cooling system.
     
   • 
     
     
     

Just like all other vehicles open hood and remove the bolts on the fire wall around the fan the fan will be bolted to the metal plate that is hiding the heater core.Know im not talking about the fan removel im talking about the plate the fan is bolted to.

The Heater Core is leaking the fluid you see is being caught on a tray below the heater core inside the vehicle.