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Air conditioner

Tiny
CODYS
  • MEMBER
  • 2013 RAM 1500
  • 4.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 137,000 MILES
My AC/heater will work every morning when I start the truck but after the first time I shut truck off it will not work unless I hit a big bump! My compressor is engaged and working but blower will not work. Sometimes it comes on randomly without hitting a bump but it never runs very long. It does this in heat and cooling mode, but when it was cold and I was running it on heat, the blower seemed to run longer that it does in AC mode.
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Thursday, May 24th, 2018 AT 10:12 PM

7 Replies

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

I would start by going to the blower motor and check the connector. It may be loose or the wires may be corroded.

Roy

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

Note:
The blower motor is located on the passenger side of the vehicle under the instrument panel. The blower motor can be removed from the vehicle without having to remove the HVAC housing assembly.
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Friday, May 25th, 2018 AT 2:24 PM
Tiny
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I checked the connection, and everything checked out great! No corrosion or loose connections! It is weird because it works every morning when I first start the truck and every time it will shut off after a few mins no matter if I am driving or idling! It blows ice cold when it does work.
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Tuesday, May 29th, 2018 AT 11:53 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay, do you have a test light to check for power at the motor? Check for power with the key on. You should have power to one wire when hooked up.

Roy
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Tuesday, May 29th, 2018 AT 11:55 AM
Tiny
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  • 4 POSTS
I will check in a little bit when I get home from work.
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Tuesday, May 29th, 2018 AT 11:57 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, sounds good. Keep me updated.
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Tuesday, May 29th, 2018 AT 11:59 AM
Tiny
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Okay, so I get home from work and start my truck and would not you guess the A/C came on! It usually only works first thing in the morning, so I was not able to see if it was still getting power when the blower is not working! Could it just be a short in the blower motor itself?
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Tuesday, May 29th, 2018 AT 6:55 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes, it could. Wiggle the connector on the blower around and see if it shuts off. If it does, it could be the motor but check the connector closely as well for any damage.

Roy
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Tuesday, May 29th, 2018 AT 7:10 PM

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