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A method of installing a replacement door closer assembly including a closer mechanism includes the steps of: (a) removing a previous door closer assembly from a mounting surface of a door or a door jamb; (b) fixing a first mounting bracket on the mounting surface through a first pre-existing mounti

A method of installing a replacement door closer assembly including a closer mechanism includes the steps of: (a) removing a previous door closer assembly from a mounting surface of a door or a door jamb; (b) fixing a first mounting bracket on the mounting surface through a first pre-existing mounting hole; (c) extending the closer mechanism of the replacement door closer assembly through the first mounting bracket while aligning a second mounting bracket with at least a second pre-existing mounting hole in the mounting surface; (d) sliding the closer mechanism back toward the first mounting bracket so that the second mounting bracket can be fixed to the mounting surface through the second pre-existing mounting hole; and (e) positioning and securing the closer mechanism between the first and second mounting brackets.

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1. A method of installing a replacement door closer assembly including a closer housing, the method comprising: (a) removing a previous door closer assembly from a mounting surface on either a door or a door jamb;(b) fixing a first mounting bracket to the mounting surface through a first pre-existin

1. A method of installing a replacement door closer assembly including a closer housing, the method comprising: (a) removing a previous door closer assembly from a mounting surface on either a door or a door jamb;(b) fixing a first mounting bracket to the mounting surface through a first pre-existing mounting hole in the mounting surface;(c) sliding the closer housing of the replacement door closer assembly through the first mounting bracket such that a portion of the closer housing moves away from the first mounting bracket;(d) sliding the closer housing such that the portion of the closer housing moves back toward the first mounting bracket;(e) fixing a second mounting bracket to the mounting surface through a second pre-existing mounting hole in the mounting surface;(f) positioning the closer housing by sliding the closer housing between a first securing portion of the first mounting bracket and a second securing portion of the second mounting bracket, the first and second securing portions being configured for gripping the closer housing; and(g) securing the closer housing to the first and second mounting brackets at a final position. 2. The method of claim 1, wherein each of the first and second mounting brackets includes a base, the method further comprising pressing the closer housing against the base of each of the first and second mounting brackets. 3. The method of claim 2, wherein the closer housing includes abutment surfaces, the method further comprising using set screws to press the abutment surfaces of the closer housing at an inward angle against the first and second mounting brackets to secure the closer housing to the first and second mounting brackets at the final position. 4. The method of claim 3, wherein the abutment surfaces are positioned opposed and aligned symmetrically relative to each other. 5. The method of claim 4, wherein each abutment surface is a stepped inclined surface. 6. The method of claim 4, wherein the abutment surfaces extend along an entire length of the closer housing forming a pair of continuous and unbroken abutment surfaces. 7. The method of claim 1, wherein the step of fixing the first mounting bracket comprises: using untightened fasteners to mount the first mounting bracket in an adjustable position on the mounting surface;adjusting the adjustable position of the first mounting bracket to a desired position on the mounting surface; andtightening the fasteners to fix the first mounting bracket in the desired position. 8. The method of claim 7, further comprising aligning the second mounting bracket by sliding the closer housing through the second mounting bracket to align the second mounting bracket with the first mounting bracket. 9. The method of claim 1, wherein the step of securing the closer housing to the first and second mounting brackets at the final position comprises gripping the closer housing with the first and second securing portions. 10. The method of claim 9, wherein each of the first and second securing portions comprises a pair of arms, each arm comprising an extending portion and a securing lip configured for restricting the closer housing to movement along a longitudinal axis. 11. A method of installing a door closer assembly including a closer housing to a mounting surface on a door or a door jamb, the method comprising: aligning a first opening in a first mounting bracket to a first pre-existing mounting hole in the mounting surface;fixing the first mounting bracket to the mounting surface through the first opening and the first pre-existing mounting hole;sliding the closer housing of the door closer assembly through the first mounting bracket and a second mounting bracket such that a portion of the closer housing moves away from the first mounting bracket;aligning a second opening in the second mounting bracket relative to a second pre-existing mounting hole in the mounting surface;sliding the closer housing such that the portion of the closer housing moves back toward the first mounting bracket;fixing the second mounting bracket to the mounting surface through the second opening and the second pre-existing mounting hole;positioning the closer housing by sliding the closer housing between the first mounting bracket and the second mounting bracket; andsecuring the closer housing to the first and second mounting brackets at a final position on the mounting surface. 12. The method of claim 11, wherein each of the first and second mounting brackets includes a base, the method further comprising pressing the closer housing against the bases of the first and second mounting brackets. 13. The method of claim 11, wherein the step of securing the closer housing comprises engaging a fixing element in a first securing portion of the first mounting bracket and in a second securing portion of the second mounting bracket. 14. The method of claim 13, wherein the fixing element is angled inwardly at an angle relative to the mounting surface to force the closer housing against a front surface of the first mounting bracket and a front surface of the second mounting bracket. 15. The method of claim 11, wherein a securing portion of the first mounting bracket and a securing portion of the second mounting bracket grip the closer housing at the final position. 16. The method of claim 15, wherein each securing portion comprises a pair of retention arms, and wherein the closer housing is secured at the final position between the pairs of retention arms. 17. The method of claim 11, wherein the first opening is one of a first pattern of openings in the first mounting bracket, and the second opening is one of a second pattern of openings in the second mounting bracket, wherein the second pattern of openings is a mirror image of the first pattern of openings. 18. The method of claim 11, wherein the step of fixing the first mounting bracket further comprises: mounting the first mounting bracket so as to have an adjustable position on the mounting surface;adjusting the adjustable position of the first mounting bracket on the mounting surface to a desired position; andfixing the first mounting bracket to the mounting surface at the desired position.