Question about 2005 Jeep Grand Cherokee

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How to replace AC blower switch relay?

With AC on, blower switch only operates in high position. Need to locate position of realy.

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  • yadayada
    yadayada May 11, 2010

    UNDER THE HOOD IN THE POWER DISTRIBUTION BOX

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You need to replace blower control relay. easy procedure. Look at www.wjjeeps.com for details. I did mine in the driveway this spring.

:-)

Posted on Aug 01, 2009

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Sentra AC


There's a 10amp fuse that powers the ac clutch relay and compressor. There are 15amp fuses that power the blower motor and the ac control switch. All of those fuses get power from the key switch. The resistor and fan switch provide the ground circuit for the blower motor.
I would want to know if those fuses are getting power, and if the control panel is working. You should be able to ground the blower motor and make it run on high, and that should not have any effect on if the ac compressor is running or not.
It could be a key switch problem in that the circuit is not strong enough to handle the load from the blower and the compressor at the same time.

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I'm going to start from the beginning.
The blower motor gets power from the high blower relay and it is grounded thru the fan switch and the resistor. So you should have power on the pink white blower wire coming from the high relay to the blower motor. The orange black wire from the motor is ground going to the resistor and fan switch. The blue wires on the control panel are for the ac compressor.
The high blower relay gets power from fuse number 5 in the box. The blower motor is grounded thru the resistor and then thru the fan switch.
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2001 tahoe heater sticks on hot


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A serious symptom of a problem with the blower motor relay is a burned or melted relay. Relays are exposed to high current loads and can sometimes get hot when they develop problems. In serious cases, the relays may heat up to the point where the interior components and plastic housing of the relay will begin to melt and burn - sometimes even causing damage to the fuse box or panel as well.
Since the blower motor relay is essentially the switch that directly controls power to the blower motor, the entire AC system will be left unable to distribute its cooled or heated air if the relay fails. For this reason, if you suspect that your blower motor relay is having a problem, have the vehicle's AC system diagnosed by a professional technician from YourMechanic. They will be able to determine if the car will need a blower motor relay replacement, or a different repair, to bring full functionality back to your AC system.

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There is a fuse for the blower motor relay. It is located in the power distribution box located in the engine compartment under the hood. Below is a picture of its location. the fuse you are looking for is in the number 13 position (see layout diagram below) and should be a 50 amp fuse. If that is not blown you may want to check the relay itself which is in the same fuse panel located in the "H" position. Power goes directly from the relay to the blower motor but am unsure of a fuse link from the realy to the blower motor so if neither one is bad you may be looking at a wiring problem or in the A/C switch otself. This should be in your owner manual if you have one. If you don't have an owners manual for your van and would like a copy, you can email me at csautomotivecars@att.net with your make, model and year and I will be happy to email you a copy. No woriies, no cost. I hope this helps and good luck.


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Have lost fan to heatr and ac...where is the fuse box or diagram?


1. Does the Blower work on High (or #4) only? If so then it is not the Front Blower Motor or the Relay that is bad, but it is the Resistor which is located behind the Glove box. Follow step #a. below and take out the Glove Box to access. It has 3 to 4 wires going into it. The wiring path is: Switches to the Resistor and then to the Motor.
2. The Front Blower Motor Relay is located in the IPM - Fuse and Relay Center. It is located in a box within the engine compartment. However: (restated) IF the Blower does only work on High then this Relay is good and you should only replace the Resistor Only. The Identification and Location of the Relays and Fuses is located on the back side (inside) of the IPM cover. Remove the cover. The Front Blower Motor Relay is the same Type (size and shape) as several other Relays in the panel. Switch out the Front Blower Motor Relay with a non-engine operation Relay for a function that you know works. Recheck the operations of both functions. If the Front Blower Relay now works and the other function now does not work, it was the Relay was bad and needs to be replaced.
a. Disconnect the Negative Cable from the Battery and wait at least two (2) minutes to deactivate the Airbag Sensors.
b. Remove the Glove Box.
c. Disconnect the Electrical Connection.
d. Unbolt/Unscrew the bolts/metal screws and remove the Resistor.
Installation is reverse of above.
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The blower resister is near the blower motor,mounted on the outside of the blower box,but actually goes inside the blower box.It~s function actually is to give the blower motor lower speeds.If it is only working on high,then this is the problem.If it works on high when you select a lower speed,then there is a high blower motor relay that is stuck in the closed position .Replace the relay.

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2001 Saturn L200 blower motor does not work in highest switch position. Move switch down to next lowest position and it works normally. This is in AC mode.


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It could possibly be the switch. Many automotive a/c blowers have a relay to engage the highest fan speed because the high current required will necessitate the use of heavy wiring to and from the blower motor and a heavy duty switch. Check for a high-speed relay and also there might be a circuit breaker in the blower system.

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