AC Blower Only Works Intermittently

Old 04-30-19, 06:45 PM
Thread Starter
Join Date: Apr 2019
Location: USA
Posts: 1
Upvotes: 0
Received 0 Upvotes on 0 Posts
AC Blower Only Works Intermittently

Hey, so I have a Trane unit that I believe was installed in 2008. For the past week or so I have been dealing with the blower working for about an hour or 2 l, then shutting off and I can only get it to turn back on after about 4 or 5 hours. Even if I turn it on fan only I still canít get it to turn on again. It just buzzes for about a minute or so like itís trying to start. Iíve looked at the blower wheel while it buzzes and it is turning but just barely.

I did did find out that the previous owners had NEVER used a filter in the system, and I did see that the blower wheel is pretty caked with dust. I had a contractor out to look at it but that was before I discovered the intermittent issue and so of course as soon as he turned it on it started right up. He tested the capacitor and said that it was a little low but not so much as to stop it from starting.

So I guess my question is, is this a symptom of the blower motor burning out, or could it be super dirty and over working the motor making it overheat? Thanks in advance!
Old 04-30-19, 10:27 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 62,054
Received 3,419 Upvotes on 3,065 Posts
Welcome to the forums.

If it is that caked with dust...... then it can be shutting down on thermal limit. Typically that problem occurs as the bearings go bad. As the motor gets hot.... the bearings seize more. Usually it's the bearing on the blower wheel side that is the culprit. Carefully try lifting up the wheel. If there is any play..... the bearing (motor) is shot.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: