Dear WeatherCat station caregivers,
I started to notice suspicious "spikes" in my outdoor temperature at the same time our central air conditioner was running. The exhaust blast could be carried under the deck where my station's temperature/humidity probe is located, so I was wondering if that component had some "issuez."
It has been several years since I had given it a good clean up so I wasn't surprised at the condition I found it in:

Further dismantling revealed the dirty conditions that the PC case fan was working in:

However, if you look carefully, you will notice a critical problem. The fasteners were badly rusted. So badly that I couldn't get them to budge!! I had bought replacement fans, but had no way to make the swap.
In the meantime at least I cleaned up the temperature/humidity probe itself:

Not being sure what else to do, I went ahead and cleaned the old PC case fan and it did appear to be running much better.

I also cleared around the temperature/humidity probe:

After a thorough cleanup, I put the components back together and I seem to have resolved the air conditioner spiking problem - at least for now.

At some point I guess I'll have to saw apart the old fan and replace it then.
When I'll find the time to make sure a repair - I most certainly do not know!!

Edouard