AC/heat fan stopped working

Tiny
LALEE2014
  • MEMBER
  • 2005 TOYOTA COROLLA
  • 1.8L
  • 4 CYL
  • 97,000 MILES
I bought this car used in the winter. The heat was working fine but slowly it became more difficult to get it to come on by turning the fan knob. Come spring the air conditioning was working great very cold lots of air coming through the vents all the sudden the fan speed knob only worked on low until it eventually stopped working. The AC button only lit up green sometimes now it does not light up at all. The other day I turned it on and it worked for like ten minutes then it just cut off now nothing. I changed the resistor and I changed the climate control module in the dash. Same problem fan speed knob doesn't work the re-circulation button lights up but not the AC button does not. I switched the relay with the horn to check the relay that was not it. I am at my wit's end trying to figure out what is causing this not to work. If anybody could help me I would appreciate it. I am trying to avoid the high cost of going to Toyota. Also, my friend checked the blower motor and it started running. Thanks
Sunday, July 29th, 2018 AT 9:46 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

I would suspect the blower resistor as the seconday failure and the blower motor as the primary failure.

Too much current flow will damage and fail the blower resistor.

Roy
Was this
answer
helpful?
Yes
No
Sunday, July 29th, 2018 AT 12:44 PM
Tiny
LALEE2014
  • MEMBER
  • 3 POSTS
So I am clear, even though when my friend tested the blower motor by hooking up tester to battery and touching wires on blower motor, and it spun, it could still be a bad blower motor? ( Sorry, I do not know the proper name for the tester) And what causes too much current flow? Thank you.
Was this
answer
helpful?
Yes
No
Monday, July 30th, 2018 AT 5:30 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes, it could work that way but the motor may be drawing more current than the resistor can handle to make it operate. It can still work but be bad. You could replace the resistor and it may fail again in a very short period of time.

Roy
Was this
answer
helpful?
Yes
No
+1
Monday, July 30th, 2018 AT 6:36 AM
Tiny
LALEE2014
  • MEMBER
  • 3 POSTS
Okay, so should my next step be to change blower motor? What causes too much current flow? Are there certain fuses that I should check?
Thank you, I appreciate these answers.
Was this
answer
helpful?
Yes
No
Tuesday, July 31st, 2018 AT 5:55 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
First, I would verify your fuses are good and there is power to the blower resistor.

If all that is good, then I would replace the blower motor and the resistor as an assembly.

The blower motor itself causes the high draw in the system.

Roy
Was this
answer
helpful?
Yes
No
+1
Tuesday, July 31st, 2018 AT 7:04 AM

Please login or register to post a reply.

Sponsored links