How do i replace headlamp in 2007 chevy equinox?

Question edited for clarity and add maker.

It is fairly easy, but you need a Beam Board to shine the lights on.

Videos

https://www.google.com/search?q=2005+Chevy+Equinox.+adjust+the+headlights

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Question edited for year make model.
Question moved to sub category.

It is a known fault on that model.

https://www.google.com/search?q=2007+chevy+equinox+gauges+not+working

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Reconnect the plug on the Coolant Temperature Sensor. He didn't reconnect it.

https://www.google.com/search?q=2007+chevy+equinox+coolant+temperature+sensor+location

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https://www.autozone.com/repairguides/Equinox-2005-2007-Torrent-2006-07/Water-Pump/Removal-Installation/_/P-0996b43f80cb1b04

The problem is your not familiar with electronic's on modern automobiles . Module controlled systems . BCM - body control modules .
The park lamps consist of the park, tail, marker and license lamps. These lamps are illuminated any time the headlamp switch is in the PARK, ON position, or anytime the body control module (BCM) illuminates the headlamps. The PARK fuse in the fuse block - instrument panel (I/P) supplies voltage to both the coil and switch input side of the park lamp relay. The BCM controls the park lamp relay by grounding the park lamp control circuit energizing the relay.

PCB Relays
This vehicle is equipped with the following PCB mounted relays. High Beam, Low Beam, DRL, Fog Lamp, Park Lamp, Stop Lamp, and Horn relay. They are directly soldered to the underhood fuseblock circuit board. A failure of one of these relays will require the whole underhood fuseblock to be replaced.

Your best bet have a qualified repair shop diagnose the problem . Could have DTC'S - diagnostic trouble codes stored in the BCM For circuit faults .
Park Lamp Switch On
B257A 00
B2057A 00
B257A 00
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When the headlamp switch is in the OFF position, the body control module (BCM) receives a ground signal through the headlamp switch OFF circuit and an open signal on the park lamp ON circuit. When the headlamp switch is in the PARK or HEAD position, the BCM receives an open signal through the headlamp switch OFF circuit and a ground signal through the park lamp ON circuit.

DTC B2585 00: Park Lamp Control Circuit - Domestic

Not sure on your Equinox, but see if your has an ignition actuator pin. They were in the older ignitions, they would break. Fairly easy to replace.

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There is a federal warranty of 5 years on all catalytic converters. It should not cost you anything to have it replaced. You stated that it was a 2007 and then a 2011, which year is it? If it is a 2007, you are almost outside of the federal warranty.

Most of the time I find that both headlight bulbs are burned out. Remove the headlamp, open the hood and remove the retainers that hold the front grill/bumper cover to the upper radiator support. The gently pull out on the front bumper cover that goes over the headlamp to release the retainer and cover retainer with tape to avoid scratching the headlamp lens. remove the 3 bolts that hold the headlamp in place 2 at the top and one down at the bottom of the headlamp on the inboard side. Pull out on the outboard bottom part of the headlamp to release the retainer. Disconnect the headlamp bulb ck for power and ground at the headlight bulb connector. Use a test light and ck the red and white wire voltage and the d blue and pnk wires for ground. The high beam is the pink wire.So connect your test light from the pink wire to the red and white wire and turn on the high beam headlights your test light should light if it does then the bulb is burned out.

You will need basic hand tools.

Headlamp Bulb: Service and Repair
HEADLAMP BULB REPLACEMENT (EQUINOX)
REMOVAL PROCEDURE
1. Open the hood.
2. Remove the fascia to tie bar push-in retainers (1).
3. Gently pull the top of the fascia assembly several inches away from the vehicle to release the radiator grille strap from the headlamp.
4. Place a piece of tape over the radiator grille strap to headlamp retaining clip to prevent scratching of the headlamp lens.
5. Remove the headlamp bolts (1, 2).
6. Pull gently on the bottom outboard corner of the headlamp to disengage the lower rear headlamp retainer.
7. Remove the headlamp from the vehicle.
INSTALLATION PROCEDURE
1. Position the headlamp into the headlamp opening.
2. Push the headlamp back into position until the lower rear retainer is fully engaged.
3. NOTE: Refer to Fastener Notice.
Install the headlamp bolts (1, 2)
Tighten the headlamp bolts to 2.5 N.m (22 lb in).
4. Remove the tape from the radiator grille strap retainer.
5. Position the fascia assembly and engage the radiator grille strap retainer into the headlamp.
6. Install the fascia to tie bar push-in retainers (1).
7. Close the hood.
8. Check and adjust the front headlamp aim after the headlamp has been reinstalled. Refer to Headlamp Aiming.