Question about 1994 Volvo 940

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My AC fan is inop. Fan fine when powered directly. Switch ohms out correctly. Fuse is fine. What else?

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  • sk67197 Jul 03, 2010

    I assume so but where does it live? Wiring diagram I have shows nothing about it.

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  • 2,926 Answers

Fan relay????

Posted on Jul 03, 2010

  • GetMeOttaHere Jul 03, 2010


    TESTING
    The electric fan switch, or thermal switch, can be checked by placing the element in a bucket of water using an ohmmeter. Heat the water to approximately 207°-216°F (97°-102°C) and connect the switch leads to an ohmmeter. The switch should have no continuity until the temperature reaches this level. Let the water cool off below 207°F (97°C) and the switch should lose continuity. If the switch has no continuity at any temperature, replace it.

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1 Answer

Which Relay/Fuse controls the power windows?


Did you check for battery voltage at the switch , with a volt meter before you replaced the main driver door switch ? Maybe you'll want to take this to pro ,instead of just replacing parts !
Symptom Chart Condition Possible Sources Action
  • No communication with the smart junction box (SJB)
  • Circuitry
  • SJB
  • REFER to Section 419-10 .
  • A single power window is inoperative - driver front power window is inoperative/does not operate correctly
  • Power window motor regulator and motor
  • Circuitry
  • Window control switch
  • Smart junction box (SJB)
  • Go To Pinpoint Test A .
  • A single power window is inoperative - passenger front, left rear or right rear
  • Power window motor regulator and motor
  • Circuitry
  • Window control switch
  • Go To Pinpoint Test B .
  • All power windows are inoperative
  • Smart junction box (SJB) fuse 30 (10A)
  • SJB circuit breaker 10 (30A)
  • Circuitry
  • Delayed accessory relay
  • Battery saver relay
  • Driver window control switch
  • SJB
  • Go To
PINPOINT TEST C: ALL POWER WINDOWS ARE INOPERATIVE Test Step Result / Action to Take C1 CHECK FOR CORRECT OPERATION OF THE INTERIOR LIGHTS
  • Turn on the interior lights.
  • Do the interior lights operate normally?
Yes
GO to C2 .

No
To continue diagnosis, REFER to Section 417-02 . C2 CHECK CIRCUIT 400 (LB/BK) FOR VOLTAGE TO THE DRIVER WINDOW CONTROL SWITCH
  • Disconnect: Driver Window Control Switch C504b.
  • Key in ON position.
  • Measure the voltage between the driver window control switch C504b pin 4, circuit 400 (LB/BK), harness side and ground.
    >
  • Is the voltage greater than 10 volts?
Yes
GO to C4 .

No
GO to C3 . C3 CHECK CIRCUIT 400 (LB/BK) FOR AN OPEN OR SHORT TO GROUND
  • Key in OFF position.
  • Disconnect: SJB C2280c.
  • Measure the resistance between the driver window control switch C504b pin 4, circuit 400 (LB/BK), harness side and the SJB C2280c pin 17, circuit 400 (LB/BK), harness side; and between the driver window control switch C504b pin 4, circuit 400 (LB/BK), harness side and ground.
    >
  • Is the resistance less than 5 ohms between the driver window control switch and the SJB; and greater than 10,000 ohms between the driver window control switch and ground?
Yes
Go To Pinpoint Test H

No
REPAIR the circuit. TEST the system for normal operation.

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1 Answer

1983 Chevrolet C10 Silverado: The AC compressor and heater blower motor fan will not come on.


The brown wire at the speed switch is the power wire. Powers is then directed to the blower motor resistor throught the orange, lt blue and yellows wires. The blower motor receives power through the orange wire. Check for power at the fuse with the key on. If there is no power the problem could be the ignition switch or the wiring in between the switch and the fuse block

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1 Answer

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Could be the blower motor resister is going bad or the a.c. fuse came loose,next time it happens,check fuse,pull out and reinstall.

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Whats needed for ac/heat and fan to work on 1997 jetta?


There was probably a short somewhere in the electrical system for your fan that was causing a fuse to blow. I'm sorry, but it will not be an easy fix. You will need a wiring schematic (from a haynes manual from autozone) of this system, a multimeter and a free saturday. Disconnect the battery. Secure the black lead from the meter to a ground point on your car. turn the multimeter to the lowest Ohms setting. Then using the meter and the wiring diagram, find all the points where power and ground have close to zero ohms. A good place to start is the switch.

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1 Answer

Have replaced compressor, drier, blower switch, blower motor, blower resistor, blower relay, direct +12 volts to dash controls. but blower motor inop. Any advice would be appreciated.


Have you replaced the fan switch? Or if you have a voltage meter you can check for voltage at the motor, and at the switch then in between where you can to isolate the short if there is one. Also since you mention running a separate 12 positive wire into the controls be sure that you connected it correctly. Also check and see if you have voltage at the wire you added. If you have voltage at the wire you added, then you need to check if the switch is letting power through it. So use your volt meter to test for voltage, check all the fan speeds also. I'm guessing you had problems with this before and that is why you have ran your own wire. So you probably kept blowing the fan fuse, this would most likely be from a bad switch, a short, or a bare wire.

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10 Answers

1997 Isuzu Rodeo V6 4X4. I have only owned this vehicle for 3wks and the fan/ac wont blow at all out the vents. The blue light comes on when i push the ac button but that is all it does. I don't know which...


C-19 Blower motor fuse 25A located in cabin fuse box. Left hand footwell on LHD vehicles, right hand dashboard on RHD vehicles.
Start by checking blower relay B-36 in the engine compartment fuse and relay box. Remove the relay. Jumper directly from battery to pins 85 and 86. (also see here: http://www.fixya.com/cars/r5544622-wire_relay if you dont know about relays) The relay should click Now measure across pins 30 and 87. Measurement should be 0 ohm.
Remove the blower motor(3 screws on the bottom of the unit under the passenger side dash) and connect jumper leads from the battery directly to the blower motor to see that it operates.
The blower motor resister is mounted on the ducting between the motor housing and the heating unit. Remove to test
Measure :
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  • pin 2-4 : 0.9 ohm
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1 Answer

Blower fan not working


The fan motor is above the passengers feet.
You will have to check for power to it.
If the fan works on at least one of the speeds,replace the resistor board directly behind the fan motor.....follow the wires from the fan motor to it.
Check the fuse for heater/AC if not power is present at fan motor with fan switch in all positions.
Also sometimes the connections at the fan motor and/or resistor board can overheat and semi melt causing a bad connection.

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1 Answer

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