If you are using wooden shelving then make sure you have the right wood screws and a powerful screwdriver to drive the screws in. If the shelving isn't particularly thick then use a shorter but stronger screw.
One can fix wall units to the wall by using the screws, bolts and other equipment provided with the unit when it was purchased. There will be directions with it as well.
When warehouse shelving is loose in a store, you should contact the manager of the store. From there the manager will get someone to fix it. Don't worry.
To fix a loose door handle, you can tighten the screws on the handle using a screwdriver. If the screws are stripped, you may need to replace them with longer or thicker screws.
To fix a loose door hinge, you can tighten the screws on the hinge with a screwdriver. If the screws are stripped or the holes are worn, you may need to replace the screws or use longer screws to secure the hinge better.
To fix squeaky floors using Squeak No More screws, locate the squeaky area, insert the special screws into the floor joists, and tighten them to secure the subfloor and eliminate the noise.
To fix a loose fridge door handle, you can tighten the screws on the handle using a screwdriver. If the screws are stripped, you may need to replace them with longer or thicker screws for a more secure fit.
To fix loose door hinges, you can tighten the screws on the hinges using a screwdriver. If the screws are stripped or the holes are worn out, you can use longer screws or fill the holes with wooden toothpicks or dowels before reattaching the hinges.
More than likely the problem is with the climate control unit. Go to a salvage lot, get a replacement unit there (it will not be expensive) and replace the one in your car. I think you can simply pull the trim piece from around the climate control unit and then the unit has 4 screws holding it in place.
To fix a loose towel rack, you can use a screwdriver to tighten the screws holding it to the wall. If the screws are stripped or the wall is damaged, you may need to use wall anchors or replace the screws with larger ones.
To fix a loose or malfunctioning doorknob, you can tighten the screws on the plate or handle, replace the screws if they are stripped, adjust the latch mechanism, or replace the entire doorknob if necessary.
To fix a loose or squeaky door hinge, you can tighten the screws on the hinge with a screwdriver. If the screws are stripped, you may need to replace them with longer or wider screws. You can also lubricate the hinge with WD-40 or a similar lubricant to reduce squeaking.
If when you say fix you mean repair the one you have then No. It is a sealed unit and can not be repaired. If when you say fix you mean repair the one you have then No. It is a sealed unit and can not be repaired.