Why is AC not blowing on the correct speeds?

Avatar
PRINCE.ROJO
  • MEMBER
  • 3 POSTS
It originally started with my AC only working on Low which makes it blow high...speeds Two and Three were pick and choose it depends on how you cycle through the speed settings to get the actual speed that actually blows, but the highest speed was always off. Recently no matter what speed setting is chosen the ac always blows high and won't turn off unless i set the speed on high and give the knob a quick tap which sometimes comes right back on until i tap it again. Im aware of the blower motor resistor, but was maybe a control switch behind the knob. Any suggestions?
Apr 12, 2012 at 5:17 PM
Advertisement
Avatar
ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
could be but you need to do a voltage check to verify. sounds like you are right.

Roy
Apr 12, 2012 at 5:22 PM
Avatar
PRINCE.ROJO
  • MEMBER
  • 3 POSTS
voltage check on the resistor? and exactly how would i do that?
Apr 12, 2012 at 5:47 PM
Avatar
ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
no, on the switch you turn for the blower speeds. you need a meter, remove the face of the controls and you need to probe the rear of the switch to verify voltage in the correct position.

Roy
Apr 12, 2012 at 5:49 PM
Avatar
PRINCE.ROJO
  • MEMBER
  • 3 POSTS
thanks any suggestion to what the actual voltage should be?
Apr 12, 2012 at 6:00 PM
Avatar
ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
will vary according to the selection. low to high for the speeds.

Roy
Apr 12, 2012 at 6:06 PM
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Frequently Asked Problems for This Vehicle