JD 3520 A/C Blower Motor

[Acolar]

Has anyone experienced a failure of the left side A/C blower motor on their 3520 cab unit?

The left side vents have no air flow from them due to left side blower motor being inoperative in all speed selections.

Will remove roof tomorrow and check for power at the LH motor, thermal fuse and grounds.

Has anyone run into this on their machine?

Thanks

Tony

 

[sunnyside360]

My 3720 A/C blower has worked fine for 2 yrs. I'd check the fuse panel prior to removing the roof to check out the blower. Let us know what you find. Good luck.

 

[Acolar]

Thanks - forgot to mention already checked the fuses F1 & F3 20A are both good.

There are some relays up behind the switch panel K6 & K7

The manual calls out a thermal fuse - not sure if they are internal to the blower or in-line. Thats why I was going to remove the roof. Had it off once to install the radio. But both fans worked fine after the roof re-install.

Will post feedback as to root cause.

Tony

 

[Acolar]

Removed the roof today to access the LH A/C Blower motor.

Perfomed a visual inspection and found the white 4-way connector which mates the tractor roof cab harness to the L/H blower motor. Found the black ground circuit (010L)
terminal was not fully inserted and seatedinside its cavity. Unmated connector and fully locked and seated the female terminal and re-mated the connector. L/H blower now works fine. This style of connector has no secondary locking feature and as such do not appear robust against pin push outs. They would not last long in the automotive environment. See attached photos.

Tony