[deano]

So this has been happening a while. It is not really just the ac fan, this is for defrost, heat, regular cabin fan, the blorwe fan in general.

Often times the fan is fine in the am when i first get in while in the garage. Then later in the day it won't come on at all. Try auto, try heat try ac.. nothing, the fan just won't blow. Occasionally (very rarely) it will all of a sudden come on, until you shut the car off again.

Here is what makes it weird, later in the day, almost always within about 20 minutes of sundown, it will come on again and will work fine at night.

So it really only seems to be during the day.

But it is not necessarily a heat issue either as this happens in the winter too while im trying to get the heat to go

Thoughts?

 

[Synovialbasher]

So this has been happening a while. It is not really just the ac fan, this is for defrost, heat, regular cabin fan, the blorwe fan in general.

Often times the fan is fine in the am when i first get in while in the garage. Then later in the day it won't come on at all. Try auto, try heat try ac.. nothing, the fan just won't blow. Occasionally (very rarely) it will all of a sudden come on, until you shut the car off again.

Here is what makes it weird, later in the day, almost always within about 20 minutes of sundown, it will come on again and will work fine at night.

So it really only seems to be during the day.

But it is not necessarily a heat issue either as this happens in the winter too while im trying to get the heat to go

Thoughts?

I had a similar issue with my old Jeep Cherokee where the fan would only work on the highest setting occasionally, would sometimes work fine, or randomly turn on and off during my drive. I ended up having to replace both the blower fan relay, and the blower fan speed resistor (https://www.ebay.com/itm/11-13-CHEV...-SPEED-RESISTOR-16452056-OEM-5A-/302534427447)

In the Jeep, I just swapped out the relay with a new one and the resistor from one I grabbed from a junkyard. This is my hunch however this system is computer controlled, and I'm not 100% on how the computer side of the system works.