Wow, that's odd! 
Does it actually feel hot at that point? It could just be a faulty temp sensor tbh. Either that or there's an airlock around the sensor that suddenly gets 'flooded' with hot water.
Atleast it doesn't sound like the matrix has failed. But it must smell awful inside so sort that door leak and dry out the footwell lol.

Does it actually feel hot at that point? It could just be a faulty temp sensor tbh. Either that or there's an airlock around the sensor that suddenly gets 'flooded' with hot water.
Atleast it doesn't sound like the matrix has failed. But it must smell awful inside so sort that door leak and dry out the footwell lol.