If it's a two-way absorption fridge (and so can run on propane), it does not have a compressor. You are hearing something else, maybe a fan or humming of the coil or even something unrelated to the fridge.
It's certainly possible that the AC heating element for the fridge could have died and it will cool on propane, or that it simply could not keep up with the hot weather to keep things sufficiently cool for some reason (perhaps the installation is poor, or perhaps there's a leaky door seal or misrouted drain tube letting warm air in, or perhaps it needs defrosting). It's also a possibility that the cooling system has failed and you won't get cooling regardless; in that case, I doubt the outside temperatures had anything directly to do with the failure, but was merely coincidental.