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After driving for 30-40 minutes the air flow from vents goes from high velocity then down to a trickle. I can hear the fan motor running but very little air flow coming out of vents. The air flow is always fine when I first start the car, but diminishes after driving for awhile. Mechanic can not find anything wrong since he can never duplicate the problem in the shop. Doing a bunch of google research it sounds like a bad evaporator sensor. Has anyone had to replace this, and is it a DIY job? Thanks!
 

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^ thats a really good question if auto or not. I haven't touched the ac system of the mazda but on other cars historically the fan is separate from the ac component. You could have a broken condenser or cut ac line etc and all the sensors would do is make sure the compressor doesnt turn on so you wouldn't get cold air but air would still blow.

The blower fan is just like a fan that only changes speed. My experience with nissans on this issue had some sort of electrical component resistor type part (cant remember for the life of me what its called) that would control fan power and if there was an issue with blower not working it was either this part or the blower itself.

Cx3 wise there's another phenomenon ive had happen occasionally. I would leave the fan control on the lowest speed or one notch above lowest (not auto) and it would randomly decide to just go full speed. Idk if this is slippage related to the hvac controls on the dash but anytime this happened id move speed up and down a notch and it would work as it should have. Im gonna swap out the dash controls if this happens more frequently in the future but at this rate it's like once maybe every 3or 4months so its been weird.

Also check your cabin air filter behind the glovebox. I discovered the joys of mice using engine cover insulation and stored it above the filter recently which was unpleasant and blocked most air flow.


Couple of things to check out and report back including the above post:

Does fan speed issue change if you turn air recirculation on and off?
Does changing fan speed up and down back to what it was when the speed drops fix the problem?
Is ac on while this happens?
Is heat on while this happens?


Also for the sake of ruling out the obvious, are you driving when fan is blowing more then stopping when its blowing less?
 
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