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Originally Posted by yosshimura
We have a problem b/c when I noticed the passenger side one wasn't spinning today, I moved it and it just spinned without any hesitation with the push of my hand, while the other one was going full force... so even though in parallel only one is working 
While in these episodes the a/c stops cooling, which obviously is tied to eng temp... |
The fan motor itself is at fault [ probably brushes, as you have verified the bearings are not locked up by hand spinning ]...
The a/c has a high pressure switch that will cut the compressor in the event that the high side pressure has reached a danger zone caused by high thermal load conditions, which is exactly what a non operating aux. fan will create. These two fans are activated by high coolant temp for the high speed and a/c high side pressure for the low speed. Either activation requires both fans to run at the same time, regardless of which system is being called for.
Fan motor should be replaced.