Question about 1994 Ford Explorer Limited

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Ac blower only runs when switch is in high position

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Sounds like a bad blower motor resistor, or the switch for the fan speed. I would suspect the resisotor 95%.

Posted on Jul 22, 2009

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1 Answer

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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Try this. When the blower is not working open the hood. Locate the blower on the passenger side near the firewall. Most likely it is covered with a thin rubber piece but it may not be. Turn the key to the run position. The engine does not need to be running. Turn the blower speed switch to high. Tap the blower with the handle end of a large screw driver. If the blower starts to work replace it.

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I have a 1995 jeep cherokee sport 4wd 4.0L with air ps/pb/cc/abs. I recently (2 weeks ago) lost all ac/heater blower speeds except high and now 2 of the wires to the ignition switch get so hot with the...


Never just replace any item because someone suggested it may have failed. Before replacing anything, you need to check each item for any signs it's bad. In addition to what I mentioned, the blower motor itself can also cause a problem if it is worn out and is drawing too much amperage to operate. If the blower makes any noise or the wiring becomes warmer than it should be after replacing any damaged parts, look at the motor. Bad motor ground can cause problems as well so check that too.

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The AC button light blinks on and off. AC won't


When the light is blinking that means there is a code in the system you will have to take it to a shop and have the codes read. Sometimes "Jiffy Lube" or "Rapid Oil Change" can read the code for but they won't fix it. If the blower motor only runs on high, the blower motor resistor is bad. When you put the fan switch on high it puts full voltage to the fan motor (blower motor) when the fan switch is in any other position, the voltage is reduced by the resistor causing the motor to run at slower speeds. The two problems are probably a result of the resistor.

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the position switch is bad replace it

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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.


Blower motor resistor. Located next to/ near the blower motor itself. These are common failures for no high speed blower operation.

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1 Answer

AC comes on in low to medium but shuts off on high.


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.

Hope this helps, rhais

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A/C blower not working on high


check for voltage at high-speed blower relay with ingnition switch in run positionin run position and switch in Hi position . if voltage is not present, check for voltage at blower switch. (note*) relay is under hood about the middle of pass side wiper.

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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.

:-)

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1 Answer

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I have the same problem. I've heard the ignition switch harness is shorting out and replacing the ignition switch ($75-$125 part) will fix it. A few torx drivers and sockets are needed to replace it (a 4mm hex socket works for the column covers, but the bolts holding the ignition switch in are even smaller. I have it apart down to where I need a smaller torx socket to continue.)

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