Question about Dodge Caravan

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I've connected the fan leads to the battery and the fan motors are good. Sometimes they actually come on. Could it be anything other than the sensor?

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Hi!!
Most common cause of cooling fan problems are the Fan Relays and the Temp. Sensor. Both fans should come on when the A/C is turned on. If they do, your problem most likely is the temp. sensor. You should have two relays one for the Fan, try swapping them also.
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Posted on Sep 16, 2010

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  • Mickey Grant
    Mickey Grant Sep 16, 2010

    I just checked and the fans come on when the air conditioning is on. You indicated that tghere are 2 relays.. I only see one which is for the engine fans. What is the other relay?

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My car starts an runs but the radiator fan is not coming on and it over heats fast. But the warning lights don't pop up on the dash board


f the engine shows signs of overheating, stop and look to see if the fan is working. With the type operated by the Connect the motor feedterminal to the live terminal onthe battery.

Check a fan motor for faults

Fan motor with the thermo-switch lead disconnected and test lead connected to the battery.Look at the battery, and take off the wiring terminals to the motor or disconnect the plug. Free the wires from clips or other fixings on the fan
A new motor is supplied without a fan, which must be refitted from the old one.The motor and fan normally come off as an assembly, but you may also have to remove the shroud and sometimes the radiator.
Separate the components. Clean the parts that are to be reused, simply by degreasing or even by repainting.
Checking the new motor When you fit a replacement motor, check it by connecting its leads directly to the battery. Be sure to connect the positive (+) and negative (-) leads to the corresponding battery terminals.Take care - the motor will kick as it starts and there will be a large spark when it is connected.
Checking the switch for faults A thermo-switch with push-on connections. The switch is threaded and has a sealing washer which must be renewed.If the fan motor is not at fault, leave the ignition switched on, take the connections off the thermo-switch and briefly touch them together.
If the fan motor now works, the switch is faulty. If it does not, check to see that there is current flowing to the switch by using a circuit tester on the feed wire to the thermoswitch.
Touch the leads together to bypass the switch.If the tester does not light, trace the lead from the thermo-switch back to its power supply; the car handbook may have a wiring diagram
A detailed drawing showing the location of electronic components and devices that are connected together in a circuit.
.If the tester lights, trace the lead from the thermo-switch through to the relay and check the terminals for tightness and cleanliness. Clean and tighten as necessary. Changing a thermo-switchThe thermo-switch is normally located in the radiator bottom tank, in the How to flush an engine radiator) until the coolant is below the level at which it is fitted. Catch the coolant in a clean container if you plan to reuse it. If a rubber cover is fitted over the back of the switch, ease it off, then disconnect the electrical connections.
The switch can now be unscrewed from its mounting point with an appropriate spanner. It may, however, be very tight, so take care not to distort the surrounding metal if it is fitted in the radiator bottom tank. Always fit a new sealing washer.
Checking the relay for faultsWith the ignition switched on, short-circuit the thermo-switch by putting a screwdriver across its two terminals; do not disconnect the leads. You may be able to hear a click from the relay as it operates. Test for current with a test lamp or circuit tester at the 'live' lead to the relay - again with the ignition switched on.
If there is current here but, when the thermo-switch is bypassed, none at the terminal for the fan-motor lead, the relay is faulty and must be replaced.
Checking the T-piece On the Datsun Cherry the thermoswitch and connections are in a T-piece on the bottom radiator hose, so look there if the switch is not on the radiator.

Sep 30, 2016 | Cars & Trucks

1 Answer

Blower Fan doesn't operate normally


No, it must be the ground for the blower motor, if you have power to the fan. Like this: you ground a voltmeter and find battery voltage on the red wire. Now move the ground lead to the ground wire, positive lead on red wire. If ground is good, meter will register voltage. If no ground, no register of the meter. Double check your ground.

Jan 26, 2013 | Cars & Trucks

1 Answer

Battery terminal corrosion


Make sure you have radio security code before removing battery leads. Remove battery leads, -ve lead first.
Clean grey oxide coating from battery terminal posts and inside battery lead terminals with abrasive pad (eg. Scotchbrite coarse) or abrasive paper and wipe clean with cloth. Liberally coat battery terminal posts and inside of lead terminals with general purpose grease or petroleum jelly. Install battery leads to battery, +ve first then -ve, and tighten securely. Do not over tighten. Spread excess grease over top of battery post and lead terminal to ensure all moisture is excluded. Replace terminal covers. Should be good for a long time.

Dec 03, 2012 | Chrysler Town and Country Cars & Trucks

1 Answer

1994 chev pu compressor replacement


Front
Without Air Conditioning
199198 C/K With Air Conditioning
  1. Disconnect the negative battery cable.
  2. Remove the instrument panel compartment.
  3. Unfasten the forward-most screw in the right side door sill plate. Remove the trim panel from the right hinge pillar.
  4. If necessary for access, unplug the ECM wiring and remove the ECM.
  5. Unplug the electrical lead at the blower motor and if equipped, remove the underdash courtesy lamp.
  6. Remove the bolt from the right side lower instrument panel support. Remove the blower cover and the cooling tube.

  7. zjlimited_612.jpg

    Fig. 1: Blower motor wiring

  8. Unfasten the flange screws and pull out the blower motor. You may have to pry back the right side of the instrument panel slightly. Be careful!
To install:
  1. Position the blower motor and install the mounting screws. Be careful not to catch the blower on anything when sliding it in.
  2. Install the cooling tube and the blower shield.
  3. Install the bolt into the instrument panel support.
  4. Attach the courtesy lamp and the blower electrical lead.
  5. If removed, install the ECM. Attach the wiring harness.
  6. Install the trim panel on the pillar. Don't forget the screw in the sill plate!
  7. Install the instrument panel compartment and connect the battery cable.


Rear
1992-98 Models
(see Figure 4)
  1. Disconnect the negative battery cable.
  2. Remove the right rear quarter panel trim.
  3. Disconnect the electrical lead at the fan.
  4. Remove the screws and if equipped, the cooling tube.
  5. If necessary, remove the fan retaining nut and lift out the blower fan.
  6. Remove the blower motor.
To install:
  1. Install the blower motor and then position the fan.
  2. Install the retaining nut and then tighten the mounting screws to 12 inch lbs. (2 Nm).
  3. If removed, install the cooling tube.
  4. Connect the electrical lead. Install the quarter panel trim cover.
  5. Connect the battery cable.

zjlimited_611.jpg

Fig. 4: Auxiliary heating and A/C system





Hope helps; keep us updated.

Feb 03, 2011 | 1994 Chevrolet C1500

1 Answer

How to remove the heater blower fan on 92 chevy 1500


Heater Core - REMOVAL & INSTALLATION
1991-92 R/V and 1991-98 C/K Series
  1. Disconnect the negative battery cable.
  2. Drain the cooling system.
  3. Remove the instrument panel glove compartment.
  4. Tag and unplug all electrical leads as necessary.
  5. Remove the center air distribution duct from the floor.
  6. If necessary, remove the ECM and mounting tray.
  7. Remove the hinge pillar trim panels.
  8. Remove the blower motor cover and then remove the motor.
  9. Remove the steering wheel and tilt back the instrument panel slightly.
  10. Remove the coolant overflow tank. Disengage the heater hoses at the core connections.
  11. Unfasten the attaching screws and nut and then remove the heater case.
  12. Remove the seven screws and lift off the heater case cover.
  13. Remove the fasteners and brackets that hold the heater core to the case and lift the core from the case.
To install:
  1. Install the heater core in the case.
  2. Install the heater case bottom plate. Make sure there is a good seal.
  3. Install the heater case into the truck. Tighten the 4 lower screws to 17 inch lbs. (2 Nm); the upper screw to 97 inch lbs. (11 Nm); and the nuts to 25 inch lbs. (2.8 Nm).
  4. Connect the heater hoses at the core tubes.
  5. Install the coolant overflow tank.
  6. Install the instrument panel and the steering wheel.
  7. Install the blower motor and cover.
  8. Install the trim panels and if removed, the ECM. Install the air distribution duct and reconnect all electrical leads.
  9. Install the glove compartment. Fill the cooling system and connect the battery cable.


Blower Motor - REMOVAL & INSTALLATION
1992-98 Models
(see Figure 4)
  1. Disconnect the negative battery cable.
  2. Remove the right rear quarter panel trim.
  3. Disconnect the electrical lead at the fan.
  4. Remove the screws and if equipped, the cooling tube.
  5. If necessary, remove the fan retaining nut and lift out the blower fan.
  6. Remove the blower motor.
To install:
  1. Install the blower motor and then position the fan.
  2. Install the retaining nut and then tighten the mounting screws to 12 inch lbs. (2 Nm).
  3. If removed, install the cooling tube.
  4. Connect the electrical lead. Install the quarter panel trim cover.
  5. Connect the battery cable.
zjlimited_45.jpg

Fig. 4: Auxiliary heating and A/C system





Hope this helps (remember to rate this answer).

Nov 09, 2010 | 1992 Chevrolet C1500

1 Answer

How do i change the blower motor on a 1994 gmc sierra 1500 truck


GM Full-Size Trucks 1988-1998 Repair Information
Blower Motor - REMOVAL & INSTALLATION

Front
Without Air Conditioning
(see Figure 1)
  1. Disconnect the negative battery terminal.
  2. Mark the position of the blower motor in relation to its case.
  3. Unplug the electrical connection at the motor.
  4. Remove the blower attaching screws and remove the assembly. Pry gently on the flange if the sealer sticks.

d506667.jpg


Fig. 1: Blower motor wiring
  1. The blower wheel can be removed from the motor shaft by unfastening the nut at the center.
To install:
  1. Install the blower wheel to the motor shaft and tighten the nut at the center.
  2. Apply a bead of sealer to the blower mounting flange. Position the blower so that the marks are aligned and install the screws.
  3. Attach the electrical connection at the motor.
  4. Connect the negative battery terminal.


1991-98 C/K With Air Conditioning
  1. Disconnect the negative battery cable.
  2. Remove the instrument panel compartment.
  3. Unfasten the forward-most screw in the right side door sill plate. Remove the trim panel from the right hinge pillar.
  4. If necessary for access, unplug the ECM wiring and remove the ECM.
  5. Unplug the electrical lead at the blower motor and if equipped, remove the underdash courtesy lamp.
  6. Remove the bolt from the right side lower instrument panel support. Remove the blower cover and the cooling tube.
  7. Unfasten the flange screws and pull out the blower motor. You may have to pry back the right side of the instrument panel slightly. Be careful!
To install:
  1. Position the blower motor and install the mounting screws. Be careful not to catch the blower on anything when sliding it in.
  2. Install the cooling tube and the blower shield.
  3. Install the bolt into the instrument panel support.
  4. Attach the courtesy lamp and the blower electrical lead.
  5. If removed, install the ECM. Attach the wiring harness.
  6. Install the trim panel on the pillar. Don't forget the screw in the sill plate!
  7. Install the instrument panel compartment and connect the battery cable.


Rear
1992-98 Models
(see Figure 4)
  1. Disconnect the negative battery cable.
  2. Remove the right rear quarter panel trim.
  3. Disconnect the electrical lead at the fan.
  4. Remove the screws and if equipped, the cooling tube.
  5. If necessary, remove the fan retaining nut and lift out the blower fan.
  6. Remove the blower motor.
To install:
  1. Install the blower motor and then position the fan.
  2. Install the retaining nut and then tighten the mounting screws to 12 inch lbs. (2 Nm).
  3. If removed, install the cooling tube.
  4. Connect the electrical lead. Install the quarter panel trim cover.
  5. Connect the battery cable.
6911e6e.jpg

Fig. 4: Auxiliary heating and A/C system




Hope this help (remember comment and rated this).



Mar 31, 2010 | 1994 GMC Sierra

2 Answers

HOW TO TEST STARTER MOTOR


heres a diagram to help, connect jumper cables or a could battery charger with 12volts high setting. put the ground cable on the casing and then connect to the connections on back of starter and starter should pop out and spin fast,b203fc3.jpg

Mar 10, 2010 | Chevrolet Chevy Cars & Trucks

2 Answers

Heater fan does not work


While you have the fan out, connect the positive lead and negative lead to the battery. If it powers up, then your problem is most likely the switch or resistor.

Jan 27, 2010 | 1994 Honda Civic

1 Answer

Fans on 1999 pontiac grand am will not come on. Have checked fuses and they are fine. No wires seem to be cut or lose. help please.


check your fan motors unplug the wires in the back of the motor take 2 wires from the battery one positive one negitive to the plug on the actual motor connect the power direct you cant di it wrong it will only go backwards so your taking the power from the battery directly to the fans see if they work.remember 2 wires 1 from the positive to the fan plug connect to 1 prong. other from the negitive to the other prong fans will kick on if there good.if there good plug back in as b 4,make sure your temp gauge is working,fuses,relays

Dec 23, 2009 | 1999 Pontiac Grand Am GT

1 Answer

Replace AC fan motor now car doesnt turn over right away.


You can try this to verify that the starter is good or bad.

prev.gif next.gif
Starter Testing Starting System Voltage Drop Tests NOTE: The battery must be in good condition and fully charged prior to performing this test.
There are three area of the starter motor circuits that voltage drop test can be performed on. These include:
  • The starter feed circuit
  • The starter ground circuit
  • The starter solenoid.
Starter Feed Circuit
  1. Disable the fuel system by removing the fuel pump fuse or the fuel pump relay.
  2. Verify that the vehicle will not start.
  3. Connect the positive lead of a voltmeter to the positive terminal of the battery.
  4. Connect the negative lead of a voltmeter to the starter B+ terminal.
  5. Turn the ignition key to the START position and note the voltage displayed on the voltmeter.
    • Ideally, there should be no more than 0.1 volt drop for each connection displayed on the voltmeter. No voltage should be consumed by the vehicle wiring
      1. If the battery cable connects directly to the starter motor there should be no more than a 0.2 volt drop measured
      2. If the vehicle uses a starter solenoid between the battery and the starter motor terminal there should be no more than 0.4 volt displayed on the voltmeter
Starter Ground Circuit
  1. Disable the fuel system by removing the fuel pump fuse or the fuel pump relay.
  2. Verify that the vehicle will not start.
  3. Connect the positive lead of the voltmeter to the case of the starter motor.
  4. Connect the negative lead of the voltmeter to the negative terminal of the battery.
  5. Turn the ignition key to the START position and note the voltage displayed on the voltmeter.
    • Ideally, there should be no more than 0.1 volt drop for each connection displayed on the voltmeter. No voltage should be consumed by the vehicle wiring
      1. If the battery cable connects directly to the starter motor there should be no more than a 0.2 volt drop measured.
Starter Solenoid
  1. Disable the fuel system by removing the fuel pump fuse or the fuel pump relay.
  2. Verify that the vehicle will not start.
  3. Connect the positive lead of the voltmeter to the case starter B+ terminal.
  4. Connect the negative lead of the voltmeter to the lug (the starter M terminal) that connects the starter solenoid to the starter motor.
  5. Turn the ignition key to the START position and note the voltage displayed on the voltmeter.
    • Ideally, there should be no more than 0.2 volt drop across the starter solenoid displayed on the voltmeter.
In general, there should be no more than a 1.0 volt drop throughout the entire starter motor feed and ground circuit. Any voltage drops measured in either the feed or ground circuits after connections have been cleaned will require replacement of the affected battery cable. Typically, any voltage drops measured in the solenoid are repaired by replacing the starter motor.

I looked at all the steps for replacing the blower motor...they should not have messed with anything that would have affected the operation of the starter.

Apr 02, 2009 | 1999 Toyota Corolla

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