air con blower switch - Hyundai Forums : Hyundai Forum
 
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post #1 of 9 (permalink) Old 03-03-2019, 12:24 AM Thread Starter
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air con blower switch

could any body tell what is involved in replacing the fan speed switch? It will only work on flat out, I have replaced the resistor but that did not make any difference.
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post #2 of 9 (permalink) Old 03-03-2019, 07:58 AM
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Are you sure it's the switch that's faulty?

It just seems odd that all the low speed positions have failed yet the high speed position (which carries the most current) still works.
If you have access to the resistor it's easy to check the switch from there by simply connecting a 12V bulb across the resistor connector terminals to make sure the bulb lights in each switch position. I can give you more detailed instructions if you want to give that a go.
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post #3 of 9 (permalink) Old 03-04-2019, 05:36 AM Thread Starter
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yes please. but as i have said ,I have replaced the resistor and it made no difference ,also i failed to say that the blower does work on pos.3 as well as 4 but not on 1 and 2.
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post #4 of 9 (permalink) Old 03-04-2019, 11:54 AM
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Disconnect the resistor, switch the ignition on then connect the bulb to the resistor connector as shown below.

The first test checks that the blower motor power supply. The bulb should illuminate when the switch is in positions 1, 2, 3, and should be off in positions 0 & 4. The three tests that follow check the ground side of the circuit that comes via the blower switch.

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post #5 of 9 (permalink) Old 03-06-2019, 09:31 PM Thread Starter
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Hi Autospark, here is the test results,
on test 1......bulb off on pos. 1 &2, on at pos. 3 and off on pos. 4
test2...........bulb off
test3...........bulb off
test 4..........bulb on
whilst playing around with it I noticed all speeds working if I pushed the switch in firmly.
All advice greatly appreciated.
regards, Fred.
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post #6 of 9 (permalink) Old 03-07-2019, 12:57 PM
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hi have a similar problem auto heater control stays on all the time have taken out blower resistor but only has three pins on when resistor
is disconnected it will only work on high speed can i do a similar test many thanks for any replies
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post #7 of 9 (permalink) Old 03-07-2019, 02:19 PM
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Quote:
Originally Posted by 2luce View Post
hi have a similar problem auto heater control
Auto heater controls use an electronic speed controller rather than a resistor but you test it in a similar way, although you need a voltmeter to test the speed control signal that is output by the AC control module.


Disconnect the speed controller, then with the ignition turned on connect the bulb between terminals 1 & 2 of the controller's harness connector....see below. The bulb should light if both the blower motor power supply and the speed controller ground are OK.


Now connect a voltmeter with the black probe to terminal 2 and the red probe to terminal 3. The meter should display a voltage that varies when you operate the blower speed control on the AC control panel. I've never done this test on the Terracan so I don't know off the top of my head what the voltage should be, but I would expect to see something like 0.3 ~ 3V

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post #8 of 9 (permalink) Old 03-09-2019, 09:30 AM
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resistor

bulb did light between 1 and 2 and voltage changed between 2 and 3 from .3 to 8 volts when blower speed was changed can i assume the blower resistor is at fault does this resistor only change the speeds 1.2 and 3 when disconnected i can turn unit on and off and get speed 4 only thanks again for your help
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post #9 of 9 (permalink) Old 03-09-2019, 09:45 AM
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Quote:
Originally Posted by 2luce View Post
can i assume the blower resistor is at fault
Yes, I think that's a safe assumption.

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Originally Posted by 2luce
does this resistor only change the speeds 1.2 and 3
Yes, the motor is running at full speed at position 4, so the resistor is completely bypassed and a direct ground is applied to the motor.

Last edited by AUTOSPARK; 03-09-2019 at 09:48 AM.
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