Intermittent fan motor, no speeds

[lotzagoodstuff]

Earlier this week, I drove my truck for the first time in a few days. I started it and warmed it up for about 30 minutes as it was completely encapsulated in ice. I know the fan motor was working as it defrosted the windshield and windows completely.

The next night I had to run out to the grocery store, and I wanted to move the truck. No fan. No low, no medium, no high speed. After coming out of the grocery store, I tried it again (it was pretty cold out) and it worked fine. I am guessing it's a bad connection on the harness or maybe the motor itself, just looking for a place to start looking for a bad connection.

 

[DaveBen]

Check the fan speed switch. Look for loose connections or corroded connections (not very likely inside the cab).

Dave

 

[79jasper]

Also may replace the blower motor resistors. Common for them to burn out.

Sent from my SAMSUNG-SM-G890A using Tapatalk

 

[lotzagoodstuff]

Also may replace the blower motor resistors. Common for them to burn out.

Sent from my SAMSUNG-SM-G890A using Tapatalk

I know the resistors are prone to failing, was thinking that I would lose the lower speeds if that happened. I think I have to wait until it doesn't work again to troubleshoot it, which will most likely be the coldest day of the year

 

[lukerichards]

Earlier this week, I drove my truck for the first time in a few days. I started it and warmed it up for about 30 minutes as it was completely encapsulated in ice. I know the fan motor was working as it defrosted the windshield and windows completely.

The next night I had to run out to the grocery store, and I wanted to move the truck. No fan. No low, no medium, no high speed. After coming out of the grocery store, I tried it again (it was pretty cold out) and it worked fine. I am guessing it's a bad connection on the harness or maybe the motor itself, just looking for a place to start looking for a bad connection.

I am having the same challenges...thanks for posting this here and to DaveBen and 79jasper for the tips...it looks like something is loose because it happens intermittently and I have not had the chance to troubleshoot yet. Am hoping it is an easy fix