AC, Kicks on sometime and shuts off

Tiny
RALPH MENDEZ
  • MEMBER
  • 2004 DODGE RAM
  • 0.7L
  • 5 CYL
  • 4WD
  • AUTOMATIC
  • 200,950 MILES
AC, kicks on sometime and shuts off. I replaced resistor and blower. It did not change. It may kick on while driving and then shuts off.
Thursday, May 17th, 2018 AT 8:33 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, thanks.

There is a blower resistor that controls the blower motor that is a common failure.

Picture attached and procedure.

Roy

1. Disconnect and isolate the negative battery cable.
2. Reach under the instrument panel near the blower motor and disconnect the wire harness connector from the blower motor resistor block.
3. Remove the two screws that secure the blower motor resistor block to the HVAC housing.
4. Remove the resistor block from the HVAC housing.

Installation:
1. Position the blower motor resistor block into the HVAC housing.
2. Install the two screws that secure the resistor block to the HVAC housing. Tighten the screws to 2.2 Nm (20 in. Lbs.).
3. Connect the wire harness connector to the resistor block.
4. Reconnect the battery negative cable.
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Thursday, May 17th, 2018 AT 12:25 PM
Tiny
RALPH MENDEZ
  • MEMBER
  • 2 POSTS
I followed the instructions; however, it still did not work. What else can I try?
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Tuesday, May 22nd, 2018 AT 8:50 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 44,365 POSTS
Hello,

You are losing power somewhere in the system. Since have already replaced the blower motor and resistor lets follow this guide and these wiring diagrams to find out where to power loss is. Also, check the grounds by reversing the test light lead to power.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (below). Please let us know what happens.

Cheers, Ken
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Tuesday, May 22nd, 2018 AT 1:02 PM

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