Electrolux model 90 canister has good suction at canister inlet, but weak suction at hose end. No blockage in hose. Water test of hose shows heavy leakage through side wall of hose. What can I do

Vacuum leak. Check all the hoses and connections for leak. Fix them and you will have nice strong suction again.

Have you remove the hose and checked the suction at the intake of the vacuum? If the motor is running there will be suction.
If there's suction here, attach the hose to the vacuum, turn it on, and check the end of the hose for suction. If there is none or very little, there's a clog or bad leak in the hose. The easiest way to check for a clog is to drop a coin in one end, lift that end up allowing the coin to drop through to the other end and out. If it drops through, the hose is clear. If not, the easiest way to clear it is to plug the hose in to the exhaust port of the vacuum, place the other end into a large garbage bag or point it outside, and turn on the vacuum. This will usually clear a blockage.
Leaks that are severe enough to result in no suction will be readily apparent as tears, cracks, or cuts in the hose. A crushed hose will also result in the loss of suction.
If suction is fine at the end of the hose, do a visual check of the wands. It's unusual for them to be blocked, but not impossible.
Check the power nozzle above and behind the brush and where it attaches to the wand. The elbow can catch long objects resulting in a blockage.
If there don't appear to be any problems with the above mentioned items, you need to take the vacuum, with attachments, to a repair shop to have it checked. It may need a new motor, but that would be due to worn out or broken fans, and that is unlikely with Electrolux vacuum motors years older than that.

You have a blockage somewhere in the unit from pickup to end of line where dirt is stored, only a blockage will cause this.

Three things are the most likely.
1. If it's an older model, the hose is likely well worn and probably has leaks at each end where it attaches to the handle and connector at the other end. If this is the case, a new hose is needed.
2. A blockage in the hose. To check the hose for blockages, detach both ends and drop a coin down one end. Lift the hose a little at a time so coin drops out the other end. If it doesn't, there's a clog. It will probably need to unclogged at an authorized Aerus Electrolux store.
3. A dirty filter. This is probably the first thing to check for, since it's so easy. If it's dirty, it needs to be thoroughly rinsed under warm water. Then allowed to thoroughly air dry prior to use. For this reason, it's highly recommended that an ECV owner have an extra filter on hand.

Is there suction at the end of the hose, or is it just at the power nozzle there's none. If the hose has good suction, check the power nozzle airway. If it's blocked it can easily be cleared by pushing the clog back toward the brush with the handle of a wooden spoon, or other similar object

A blockage in the pipes is also possible, and for this you'll probably need to call someone in.

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Three things are the most likely.
1. Since it's an older model, the hose is likely well worn and probably has leaks at each end where it attaches to the handle and connector at the other end. If this is the case, a new hose is needed.
2. A blockage in the hose. To check the hose for blockages, detach both ends and drop a coin down one end. Lift the hose a little at a time so coin drops out the other end. If it doesn't, there's a clog. It will probably need to unclogged at an authorized Aerus Electrolux store.
3. A dirty filter. This is probably the first thing to check for, since it's so easy. If it's dirty, it needs to be thoroughly rinsed under warm water. Then allowed to thoroughly air dry prior to use. For this reason, it's highly recommended that an ECV owner have an extra filter on hand.

Is there suction at the end of the hose, or is it just at the power nozzle there's none. If the hose has good suction, check the power nozzle airway. If it's blocked it can easily be cleared by pushing the clog back toward the brush with the handle of a wooden spoon, or other similar object.

This is exactly the symptom you would expect from a defective bag control valve. The actual control valve sits under the dial on top of the vac and often cracks internally. It can be replaced in about 15 minutes by a good tech with genuine parts from AERUS Elctrolux dealer or repair center.
You can open the vac front to rear like a **** shell by sliding the bumpers out the front with the bag door open, however you must be careful not to disturb the wiring harness and to mark wiring locations. The body must be carefully realigned for closure. If it is not perfect you will not be able to slide the bumpers back in.

If this is an Electrolux, start by testing the suction at the inlet nearest the vac or at the 30 degree elbow on the left. If you have suction there but not elsewhere, and can hear the vac running when the hose is plugged in you have blockage in your main line between the vac and the rest of the house.
You should first test the hose, then the inlets one by one. Drop a quarter into the handle of the hose and shake it through to the far end. If it comes out your hose is clear. Next mark a tissue with a number and **** it into the hose at each inlet, checking the bucket to see if teh tissue has claered the lines. If none of the tissue make it to the bucket, , get a shop vac, open the inlet nearest the vac and **** the obstruction backwards out the inlet. As blockage clears you will hear thinks moving in the pipe. Post back with results

clean all the filters if this doesn't help then check for blockages at head, hose and entrance to collection chamber

Obviously no suction in hose would indicate a blockage, over heating is a breaker that shuts off the machine when it over heats. There is no way to clean hose the on this model because the hose does not detach at either end, therefore I had to employ the use of the good old wire hangar. Job complete up and running, with good suction. It is amazing what a prayer to God can do.

Unfortunately alot of people buy this model because of the electrolux name, but it is actually made by eureeka. Aerus-Electrolux is the manufacturer of the high quality machines of our parents day.