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I want to see if my radiator fans are operational so I want to wire it directly to the battery. The problem is do I wire both negative and positive?

Fans do not come on. I changed the thermostat and flushed the system out.

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  • 112 Answers

Wish you had stated make/model here.
Before 'hotwiring' fans - test to see if power is actually going to fan(s) - on most cars with two fans - one is ran from engine temp sensor, while the other is run from the A/C system (and for example on Nissan Maxima will not run unless A/C is actually on).
To test get a simple test light - with car at temp test the positive to negative connection at the wire harness connector (should be near fan). Also, test positive to a good ground point. This way you know if power is going to fans.
To 'hotwire' an individual fan - unplug fan from harness - using same grade of wire (2 wires one from positive side of battery to positive input of fan harness, 2nd wire from negative side of connector to a known good ground). - fan should run at that point - if it doesn't and power to harness, replace fan.

Posted on Nov 25, 2014

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: RADIATOR FAN

If you've got the hydraulic fan, check to see that the solenoid at the power steering pump is plugged in. My 1993 3.0 had this happpen, and that's what was wrong. You have to pull the front passenger side wheel off to access the pump. Just stick your hand up in there and feel around. You'll find it. One way to check is to let the car idle and turn the a/c on full blast. You should hear the fan start to roar after a few seconds. If it doesn't, then check the solenoid wire. Worked for me!

Posted on Sep 14, 2008

  • 2920 Answers

SOURCE: cooling fans not working on 1995 camaro z28

you have a burnt fan relay...if it were my car i ould run a jumper to the fuse panel so that when you turn the key on the fan will also come on and run.its not hard to do and it will stop the car from overheating

Posted on Jan 24, 2009

  • 345 Answers

SOURCE: peugeot expert 2.0 hdi heater problem, fan working ok, no heat

check the water pump

Posted on Feb 07, 2009

sandanrosie
  • 53 Answers

SOURCE: 2003 intrepid over heating

check and see if there is a bleeder for the cooling system its usally located be the thermostat , there is a posibility it could be air bound. also if your claim is overheating and you are seeing this on the gauge try to verify coolant temp with a scanner you may have a bad sensor for the gauge-Goodluck

Posted on Aug 28, 2009

roniecon
  • 6826 Answers

SOURCE: 97 dodge cooling fans stoped working

If you have checked the relay module under the fans,on drivers side,and they are fine,replace the coolant sensor,and make sure all the air is bled out of the cooling system.

Posted on Jul 10, 2010

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My 01 toyota corolla le radiator fans wont work


Using a test light connect the lid to NEGATIVE and start the engine with A/C on.back probe the positive terminal on the fan.If no power test the fuse. if fuse OK switch the relay with the horn relay and test again. if you have a power to the fan connector switch the test light lid to POSITIVE on you battery and test for good ground to the fan.some times ground wire can corrode and create a lot of problems. If you have good Power and Ground replace the fan.
good luck

Mar 01, 2015 | 2001 Toyota Corolla

1 Answer

ON RADIATOR FANS CAN YOU UNPLUG THE ADAPTER CORD AND RUN 2 WIRES FROM A BATTERY ( NEGATIVE AND POSITIVE) TO THE NEGATIVE AND POSITIVE PRONGS ON THE FAN PLUG TO SEE IF THE FAN MOTOR IS BURNED UP, I HAVE...


each color is for different rpms
ground a wire to the motors metal body and touch one of the colored wires to a positive wire from the battery to check

Feb 26, 2011 | 2001 Chevrolet Impala

1 Answer

I had the battery replaced, there is one positive and one negative wire, but then there is a third wire that connects to the negative (?) terminal coming from the radiator fan yes or does this one...


where does the wire go to? and waht color is it? If it is red then it will go to the positive side, if it is black it will go to negative side. If the wire is any color other than those try putting it on the negative side first and start the car up and see if the fan kicks in. If it doesnt kick in after several minutes of idle time try connecting it to the positive side. If it sparks then put it back on the negative side. Thats what i would do in your case. Good luck

Dec 09, 2010 | 1996 Chevrolet Cavalier

1 Answer

Where are the bolts to remove the starter on a 1993 quad 4 grand am?


REMOVAL & INSTALLATION
Except 2.3L and 2.4L Engines

  1. Disconnect the negative battery cable.
  2. Raise and safely support the vehicle. Disconnect the electrical wiring from
    the starter, if accessible.
  3. If necessary for access, unfasten the three dust cover bolts, then pull the
    dust cover back to get to the front starter bolt. Remove the front starter bolt.

  4. Remove the rear support bracket.
  5. Pull the rear dust cover back (if applicable) to gain access to the rear
    starter bolt and remove the rear bolt.
  6. Note the number and location of any shims.
  7. Push the dust cover back into place (if removed), then lower the starter
    (disconnect any wiring if previously inaccessible) from the vehicle.
    To install:

  8. Position the starter in the vehicle, connect the wiring, then install the
    rear starter bolt.
  9. Install the front starter bolt, then tighten both bolts to 32 ft. lbs. (43
    Nm)
  10. If removed, install the dust cover and the rear support bracket.
  11. Connect the electrical wiring to the starter, if not already attached.
  12. Carefully lower the vehicle, then connect the negative battery cable.




    Fig. 1: Once the vehicle is raised and safely supported, you
    will be able to see the starter motor
    86883015.jpg





    Fig. 2: After disconnecting the wiring, remove the starter
    mounting bolts
    86883016.jpg





    Fig. 3: When removing the starter, be sure to note the number
    and location of any shims
    86883017.jpg





    Fig. 4: View of the starter mounting - 3.1L and 3.3L engines
    91062g09.gif

2.3L Engine
1988-89 (VIN D)

  1. Disconnect the negative battery cable.
  2. Remove the air cleaner to throttle body duct.
  3. Label and detach the TPS, IAC and MAP sensor connectors.
  4. Remove vacuum harness assembly and the MAP sensor vacuum hose from intake
    manifold, then position aside.
  5. Unfasten the cooling fan shroud attaching bolts, then remove the shroud
    (including the MAP sensor).
  6. Remove the coolant fan-to-upper radiator support bolt, then unfasten the
    remaining upper radiator support bolt and the upper radiator support.
  7. Detach the connector from the cooling fan.
    NOTE: Because of the low clearance, be very careful not to
    damage the TPS lock tang with the fan bracket.


  8. Lift the fan assembly out of the two lower insulators. Rotate the bracket so
    the two lower bracket legs point upward. Move the fan assembly toward the left
    (drivers) side until the fan blade overlaps the radiator tank-to-core seam about
    1 inch (25mm). Lift the fan assembly from the engine compartment.
  9. Remove the harness retaining clip from the engine mount bracket stud.
    Unfasten the starter mounting bolts.
  10. Tilt the rear of starter towards the radiator, pull the starter out, then
    rotate solenoid towards the radiator to gain access to the electrical
    connections.
    NOTE: Be careful not to damage the crank sensor mounted
    directly to the rear of the starter. If it gets damaged, it must be replaced.


  11. Detach the electrical connectors from the solenoid.
  12. Move the starter toward the driver's side of the vehicle, then lift it from
    the vehicle.
    To install:

  13. Insert the starter between the throttle body and the air cleaner housing,
    then move it toward the right (passenger) side.
  14. Attach the solenoid electrical connectors. Make sure to properly position
    the plastic guard over the stud and nut for the battery cable.
  15. Rotate the starter into the proper position, install any shims that were
    removed and secure using the mounting bolt. Tighten the bolts to 74 ft. lbs.
    (100 Nm).
  16. With the fan's bracket two lower legs facing upward, place the fan assembly
    between the throttle body and the radiator while overlapping the radiator
    tank-to-core seam with the fan blade by about 1 inch (25mm). Be careful not to
    damage the lock tang on the TPS.
  17. Rotate the fan bracket, then place the two lower legs into the insulators.
  18. Attach the electrical connector to the cooling fan.
  19. Install the upper radiator support and the coolant fan should, then install
    the fan-to-upper radiator support mounting bolt.
  20. Connect the MAP vacuum hose and the vacuum harness assembly to the intake
    manifold.
  21. Attach the TPS, IAC and MAP sensor connectors.
  22. Install the air cleaner to throttle body duct.
  23. Connect the negative battery cable, then check for proper starter operation.

1990-95 (VIN D), 1989-94 (VIN A), 1992-94 (VIN 3)

  1. Disconnect the negative battery cable.
  2. If necessary for access, remove the air induction tube.
  3. Detach the coolant fan electrical connector, then remove the fan assembly.
  4. Remove the oil filter, if necessary for access to the starter.
  5. For vehicles through 1990, remove the intake manifold brace.
  6. Remove the mounting bolts; some engines may have 3 starter mounting bolts.
    Pull the starter out of the hole and move toward the front or passenger side of
    the vehicle.
  7. Disconnect the wiring from the solenoid.




    Fig. 5: Starter mounting for 2.3L engine - 1990-95 models
    91062g10.gif

  8. Remove the starter by lifting it between the intake manifold and the
    radiator.
    To install:

  9. Lower the starter between the intake manifold and the radiator, then connect
    the wiring to the solenoid.
  10. Rotate the starter into installation position and install the mounting
    bolts. For vehicles through 1994, tighten to 74 ft. lbs. (100 Nm). For 1995
    vehicles, tighten the bolts to 32 ft. lbs. (43 Nm).
  11. If equipped, install the intake manifold brace and oil filter, if removed.
  12. Install the cooling fan assembly, then attach the electrical connector.
  13. If removed, install the air induction tube.
  14. Connect the negative battery cable and check the starter for proper
    operation.

2.4L Engine

  1. Disconnect the negative battery cable.
  2. Remove the air inlet duct attached to the throttle body.
  3. Remove the top starter bolt.
  4. Raise and safely support the front of the vehicle securely on jackstands.
  5. Remove the lower starter bolt.
  6. Position the engine wiring harness aside.
  7. Position the starter for access to solenoid wiring.
  8. Remove the wiring attached to the starter.
  9. Carefully lower the starter.
    To install:

  10. Attach the wiring to the starter and position the assembly into place.
  11. Install the lower starter bolt.
  12. Reposition the wiring.
  13. Lower the vehicle and install the upper starter bolt. Tighten the bolts to
    66 ft. lbs. (90 Nm).
  14. Attach the air inlet duct to the throttle body.
  15. Connect the negative battery cable.


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Oct 31, 2010 | 1993 Pontiac Grand Am

1 Answer

Radiator fans not working on my 1995 chevrolet caprice classic


The signal path is that coolant sensor tells ECU that the engine is 'hot'. Voltage at the relay for the fans switches on main voltage via a fuse to the fans. Check the fans first; run a wire from the live battery terminal to the fans' positive connection. If the fans do not operate check the negative wires from the fans for continuity and quality of connections. If fans do run then check the fuse and the fan relay. The fan relay might be interchangeable with one of the other relays (main lights?) so temporarily swap it over and see if that has any effect.

Sep 18, 2010 | 1995 Chevrolet Caprice

1 Answer

How to change the radiator fan?


Electric Engine Fan - Fan Switch

Removal & Installation
2.7L Engine
  1. Disconnect negative battery cable.
  2. Partially drain cooling system.
  3. Disconnect the electrical connector .
  4. Remove engine coolant sensor from coolant outlet tube .
To install:
  1. Apply thread sealant to sensor threads.
  2. Install engine coolant temperature sensor into coolant outlet tube.
  3. Tighten sensor to 20 ft. lbs.(28 Nm) torque.
  4. Connect electrical connector to engine coolant temperature sensor .

3.2L And 3.5L Engines
  1. Disconnect negative battery cable.
  2. Partially drain cooling system.
  3. With the engine cold, disconnect coolant sensor electrical connector.
  4. Remove sensor.
To install:
  1. Install engine coolant temperature sensor.
  2. Tighten sensor to 20 ft. lbs.(28 Nm) torque.
  3. Attach electrical connector to sensor.
  4. Connect negative battery cable.
Removal & Installation
  1. Disconnect negative battery cable.
  2. Partially drain cooling system.
  3. Remove upper radiator hose.
  4. Disconnect cooling fan electrical connector.
  5. Remove cooling fan mounting bolts.
  6. Remove radiator cooling fan assembly from vehicle.

    f9d971c.jpg
    Fig. Removal and installation of the radiator fan-2.7L Engine shown
To install:
  1. Position radiator cooling fan assembly in vehicle.
  2. Install cooling fan mounting bolts. Tighten to 50 inch lbs. (6 Nm)
  3. Connect cooling fan electrical connector.
  4. Install upper radiator hose .
  5. Fill cooling system.
  6. Operate engine until it reaches normal operating temperature.
  7. Check cooling system and automatic transmission for correct fluid levels.

Hope helps (remember comment and rated this).

Jul 13, 2010 | 2001 Dodge Intrepid

1 Answer

1994 Dodge Caravan 3.0L: Overheating when idleing. Fine on the highway but when I stop it overheats. Radiator fan is not coming on. Checked fan (wire direct to battery) and its fine... Replaced coolant...


You problems in the cooling fan relay and why the fan is not activated verifies the terminale 85 86 one has to be positive and the other is negative the negative comes the computer...

Jul 03, 2010 | Cars & Trucks

1 Answer

How do you replace a radiator in a dodge shadow 1993


These are the instructions for a 4 cylinder motor.

  1. Disconnect the negative (-) battery cable.

CAUTION Do NOT remove the cylinder block or the radiator draincock with the system hot and under pressure because serious burns from coolant can occur.
  1. Drain the cooling system.
  2. Remove the hose clamps and hoses from the radiator. Remove the coolant reserve system tank-to-filler neck tube.
  3. Remove the automatic transaxle hoses, if so equipped.
  4. Remove the fan and fan support assembly by disconnecting the fan motor electrical wiring.
  5. Remove the fan shroud retaining clips, located on the top and bottom of the shroud for most of the vehicles (the Dynasty has them only on the top).
  6. Lift the shroud up and out of the bottom shroud attachment clips separating the shroud from the radiator. Avoid damaging the fan.
  7. Remove the upper radiator mounting screws. Disconnect the engine block heater wire, if so equipped.
  8. Remove the air conditioning condenser attaching screws located at the top front of the radiator, if the vehicle is equipped with air conditioning.
  9. Lift the radiator free of the engine compartment.
Care should be taken to NOT damage the radiator cooling fins or water tubes during removal or installation.
To install:
  1. Slide the radiator down into position behind the radiator support.
  2. Attach the air conditioning condenser to the radiator, if so equipped, with a force of approximately 10 lbs. (44 N) to seat the radiator assembly lower rubber isolators in the mount holes provided.
  3. Tighten the radiator mounting screws to 108 inch lbs. (12 Nm).
  4. Connect the automatic transaxle hoses, if so equipped. Tighten the hose clamps to 35 inch lbs. (4 Nm).
  5. Slide the fan shroud, fan and motor down into the clips on the lower radiator flange. Install new shroud retaining clips.
  6. Install the upper and lower radiator hoses (including the coolant reserve hose).
  7. Plug the fan motor electrical connection and attach the negative (-) battery cable.
  8. Fill the cooling system with coolant (refer to Section 1 for more details).
  9. Operate the engine until it reaches normal operating temperature. Check the cooling system and automatic transaxle (if equipped) for the correct fluid levels. Also check for coolant leaks.
Here are the instruction for a 6 cylinder engine.
6-Cylinder Engines
  1. Disconnect the negative (-) battery cable.

CAUTION Do NOT remove the cylinder block or the radiator draincock with the system hot and under pressure because serious burns from coolant can occur.
  1. Drain the cooling system.
  2. Remove the hose clamps and hoses from the radiator. Remove the coolant reserve system tank to filler neck tube.



  1. Remove the automatic transaxle hoses, if so equipped.
  2. Remove the fan and fan support assembly by disconnecting the fan motor electrical wiring.
  3. Remove the fan shroud retaining clips, located on the top and bottom of the shroud for most of the vehicles (the New Yorker, Dynasty, Fifth Ave., and Imperial have them only on the top).
  4. Lift the shroud up and out of the bottom shroud attachment clips separating the shroud from the radiator. Avoid damaging the fan.
  5. Remove the upper radiator mounting screws. Disconnect the engine block heater wire, if so equipped.
  6. Remove the air conditioning condenser attaching screws located at the top front of the radiator, if the vehicle is equipped with air conditioning.
  7. Lift the radiator free of the engine compartment.
Care should be taken NOT to damage the radiator cooling fins or water tubes during removal or installation.


To install:
  1. Slide the radiator down into position behind the radiator support.
  2. Attach the air conditioning condenser to the radiator, if so equipped, with a force of approximately 10 lbs. (44 N) to seat the radiator assembly lower rubber isolators in the mount holes provided.
  3. Tighten the radiator mounting screws to 9 ft. lbs. (12 Nm).
  4. Connect the automatic transaxle hoses, if so equipped. Tighten the hose clamps to 35 inch lbs. (4 Nm).
  5. Slide the fan shroud, fan and motor down into the clips on the lower radiator flange. Install new shroud retaining clips.
  6. Install the upper and lower radiator hoses (including the coolant reserve hose).
  7. Plug the fan motor electrical connection and attach the negative (-) battery cable.
  8. Fill the cooling system with coolant (refer to Section 1 for more details).
  9. Operate the engine until it reaches normal operating temperature. Check the cooling system and automatic transaxle for the correct fluid levels. Also check for coolant leaks.
please let me know if i can assist you in any further problems you may encounter with your vehicle.
please do not forget to rate and comment about your experience with fixya today.


Dec 27, 2009 | 1993 Dodge Shadow

1 Answer

Radiator fan is not kicking on when it should


First off, I would disconnect the power supply to the fan and let the engine heat up to operating temperature and use a simple volt meter (you can purchase one at walmart or any part store for $5-15) to see if any voltage is even getting to the fan, it is possible that the fan motor could have failed. Also, you can run a couple wires directly from the battery to the fan ( one for negative, one for positive) it shouldn't matter if you switch up which is which on the fan, as a DC motor will just spin in reverse if you swap the polarity. This will rule out the possibility of the fan.

Sep 02, 2009 | 1994 Mitsubishi Eclipse

1 Answer

Radiator fans wont turn on to cool radiator for 2001 dodge grand caravan


To check it run wires from the positive and negative battey posts directly to the fan motor connector. If it doesn’t run the fan motor is defective.

Aug 04, 2009 | 2001 Dodge Caravan

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