You may try loosening the hinge screws and realigning the door slightly. You could also replace the magnetic gasket. Weak holding is exasperated by the pressure of closing the lower door pushing up through the common ducts.

 

If you can't successfully adjust the door (above)...

..glue on a silicone self-stick latch, like used for child-prooofing cabinets. An appliance pro suggested that for an oven door once, and it's still working fine after several years.

 

When I was driving truck I used 2" wide velcro to keep the fridge door from opening.
Being that yours is just a garage fridge that may be acceptable for you (cheap too).

 

You obviously have a ghost in your garage

 

Raise the front legs. You garage floor is sloped and fridges need to be tilted back slightly.

Of course, if the door binds when closed and if the gasket is too old you'll have to fix those issures first. (use the dollar bill trick of inserting a bill and close the door on it - then pull or wiggle the bill along the gasket to see where it may be old, hardened and allowing air transfer).

 

put a latch on it, we did that to an upright freezer years ago, still works well today.

 

I put these on my wife's freezers

Amazon.com

 

you can drill small holes on the edges, wont hurt anything. you can even put some silicone on the screws before inserting them.

 

Why silicone? Is it to hold the screw tight so that it doesn't get loose in the future

 

Latches on refrigerators need to be installed with care. If the latch is too loose the door might rattle, or the door might be held slightly ajar. If the latch is too tight, adhesive fastenings might peel off or the child resisting lever or button might be very hard to depress.

 

My daughters freezer in the garage did that. When you closed the fridge door, there was enough air forced into the freezer to pop it open. I found a latch on line that was sold as a kiddie proof latch, attached it with double stick tape.

 

Not a pro, but some freezers have heater elements in the walls to cycle on and eliminate condensation. Caution drilling holes.
Bud

 

Look to see if there is residue / crud / sticky stuff, on the magnetic surface or the frame.

Clean it.

ED

 

Maybe start with a bullseye level to make sure the machine is level & plumb. If it's out of level & plumb, closing one door may pop the other open.
A good way of leveling a refrigerator (or other heavy item) is by using car thief bags. Shove a bag under the 3 lowest corners and pump until the bullseye shows good. Then adjust the feet or put shims as needed.

Also note that many (most?) refrigerator-freezers have an air damper between the sections. Mine does and once in a while it'll get stuck partly open with frost. When it does, the freezer door pops open when the refrigerator door is closed.
Paul

 

Level the fridge as above.
Put a magnetic hook on the side. Loop a bungee cord through the handle to the magnetic hook.

 

Don't need a magnetic hook.

There are stick on hooks made for walls and picture hanging.

ED