I want to replace the back struts on 2001 Avalon.

battery is under rear seat to charge it open the hood right strut tower connect positive to connector under the red cap ground to any good ground usually there is one bolt on strut tower also

You might have to remove rear seat and rear speaker cover...or from inside trunk

Sounds like the strut mount has let go. Your best bet is to find what is called a quick struts. This will be a complete strut assembly with spring and munt completely assembled. They will run you a couple hundeed a piece. Simply unbolt the old strut and bolt in the new strut and you should be good to go. A strut mounting kit is also available. To replace this the strut will need to be removed. The. The spring will need to be compressed. The strut can then be removed. Then the spring will be uncompressed. The parts replaced. The spring compressed and the strut reinstalled, You will need to bring the strut to a shop to have the spring compressed. Quick struts are way easier and more DIY friendly.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

This could be lots and lots of different things but most likely is the bearings in the top of the suspension tower. You need to jack the wheel up and turn the wheel left and right to check, also grab the strut and wiggle it back and forward.
If there is movement or noticeable noise coming from top of strut then you need to replace the suspension strut top hat complete with the bearing in it.

I should not try to answer this as I have never seen the inside of a 2001 740 trunk but..........
I am pretty certain that you will need to pull up the trunk lining and it won't be easy. If you want to do this without damaging the lining, you will probably need to remove other parts, such as the rear deck speakers and likely the rear seat back, to get the lining out.
Or you can just take a box cutter to the lining at the top of the shock tower and glue it back when you are done. Much quicker.
How much do you care about how the inside of the trunk looks? Getting the rear speakers out of a 10-year-old BMW without damaging the speaker grills is tricky as well, and I would be a lot more worried about the appearance of my speaker grills than my shock towers.

YOU HAVE TO REMOVE REAR SEAT CUSHION TO GET TO STRUT TOWERS.

Hello, and welcome to FixYa. I'll be glad to help you out.

When you had the struts replaced, one of two things happened.

one - the rear strut retention bolts were not tightened up properly at the tops of the struts

two- the top supports on the struts were not replaced. Whenever we change the struts, we always replace the top supports. More than likely, this is your problem. The rear strut supports are notorious for wearing out, and, when they do, they make loud banging noises.

2004 Camry rear support part numbers:

Left: 48750-33062
Right: 48760-33062

I would suggest replacing the top supports to cure your problem.

Thank for choosing FixYa for advice!

1. Raise and safely support the vehicle.
   
2. Remove the wheel and tire assembly.
3. Unfasten the retainer(s), then remove the hydraulic flex hose bracket from the strut bracket. If equipped with ABS, the wheel speed sensor cable routing clip is also attached to the strut assembly bracket.

1. Support the rear knuckle, suspension and brake components before removing the clevis bracket-to-knuckle attaching bolts. Do NOT allow the weight of the knuckle and related components hang without support when the strut is removed.


WARNING The knuckle-to-strut attaching bolts are serrated and must not be turned during removal. Remove the nuts while holding the bolts stationary in the knuckle.

1. Hold the bolt with a wrench, then unfasten the 2 clevis bracket nuts attaching the strut to the knuckle.

Fig. Fig. 2: Location of the knuckle-to-clevis bracket bolts

1. Carefully lower the vehicle, then open the trunk. Access to the rear upper strut mount-to-strut tower attaching bolts is through the trunk of the car.
2. If necessary, remove the carpet from the top of the strut tower. Then, remove the rubber dust shield from the top of the strut tower for easier access to the upper strut nuts.

1. Loosen, but do not remove the 4 upper strut mounting nuts. Then, while supporting the strut assembly, fully remove the 4 strut mount attaching nuts.

1. Remove the strut assembly from the knuckle by sliding the knuckle out of the clevis bracket on the strut, then remove it from the vehicle.

Carefully pull the strut assembly out of the vehicle
To install:

1. Position the strut back into the vehicle with the 4 studs on the strut mount assembly through holes in the strut tower of the vehicle. Install the 4 strut mount-to-body attaching nuts onto the mount studs. Tighten the nuts to 25 ft. lbs. (34 Nm).
2. Install the dust shield into the opening on top of the strut tower. Install the carpeting back on top of the rear strut tower.
3. Raise and safely support the vehicle.
4. Install the knuckle into the clevis bracket on the strut assembly. Install the 2 clevis bracket-to-knuckle attaching bolts and nuts. Hold the bolts with a wrench while tightening the nuts to 70 ft. lbs. (95 Nm).
5. Install the brake hose bracket to the strut bracket and secure with the retaining bolts. If equipped with ABS, the wheel speed sensor cable routing clip is also attached to the strut bracket.
6. Install the wheel and tire assembly on the vehicle. Tighten the lug nuts evenly, in sequence, to 100 ft. lbs. (135 Nm).
7. Carefully lower the vehicle.
8. Have the toe checked and adjusted as necessary.

First you must remove the rear seat to gain access to the top strut mounts. The bottom of the rear seat comes out first. On the 91 model there are two tabs at the base of the seat bottm that you pull forward to release the seat bottom. I'm not sure if the 89 is the same. After removal of the rear seat bottom, you will see a bolt at the bottom of each side of the rear seat back that need to be removed. Fold down the arm rest and disconnect the vinyl cover at the base of the armrest to expose and remove two screws. Push up on the rear seat back to unhook three plastic hooks (center and one at each end) at the top of the rear seat back. Remove the seat back. Remove the large metal support panel that is behind the seat back. Safely jack up the rear of the car and support on jack stands so the rear wheels hang free. Doing one strut at a time, remove the two top strut mount bolts leaving the center strut stud nut in place. The strut and mount will lower out of the unibody. Disconnect the bottom strut mount. Remove the strut/coil spring assembly. Using a strut/spring compressor (some auto parts stores rent these) compress the spring. Carefully remove the top strut stud retaining nut, top strut mount, bumpers and strut boot. Carefully install compressed spring, strut boot, bumpers and top strut mount on new strut and install washer and retaining nut. Reinstall strut and etc. in reverse order.

remove the rear seat.
(pull up on the front of the rear seat to remove)