That gurgling sound you hear is blockage/clogging that is inhibiting proper flow.
The ammonia/hydrogen mixture gets heated (electric/gas) and turns into a vapor then flows by gravity back down thru cooling tubes/fins absorbing the heat (cooling freezer/fridge) and turns back into liquid.
When operated off level that gravity flow is interrupted, over heating occurs, crystals form/stick to tube and cause blockage which causes more overheating and more crystals to form .....etc. The damage is accumulative.
Eventually a tube will get overheated enough due to lack of flow and will crack.
There is no cure......only band-aid fixes.
Replacement cooling units are available.
Check this place out....good rep, good pricing, great customer service and they have new and remanufactured cooling units...
LINK
Is it time for your medication or mine?
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31