Question about 1999 Plymouth Voyager

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99 voyager engine cooling fans not coming on, fuses test ok. Is there a thermal switch in the cooling system, if so how do I locate it?

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Posted on Jul 12, 2009


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2.6 on 190e cooling fans not running overheats in traffic

In the old days the cooling fans were operated by a thermal switch mounted in the radiator or high in the engine. Sometimes the switch was a dual stage switch to operate one or two fans at high/low speed or to operate two fans in a sequence. The switch in these cases would provide a supply to an electronic control to provide the speeds or sequence. Mostly the thermal switch either switched on the fans directly or through a relay.

Both the fan motors and the switches tend to be very reliable and in the case of a problem are fairly simple to eliminate by independently testing them and checking the supply. This becomes easier when you have discovered which system your car uses. Begin by checking the fuse. Your vehicle handbook should provide that information.

Late model cars could have the cooling fans switched on by the engine management system so apart from the fuse and motors, wiring, etc. the diagnosis could be more complex.

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How do I test mercury sable 1999 24v dohc test radiator cooling fans

Check fuse 9 at fusebox in the engine compartment. The two dans are on seperate replays so chances are the fuse might be bad.

If you need further help, reach me via phone at

Nov 04, 2015 | Mercury Cars & Trucks

1 Answer

Cooling fan does not work

unplug fan. apply power and grond. dark green is B+ and black grond.
if fans come on they are ok. check fuse 24 in the pdc(under the hood fuse block). should be a 40 amp fuse. if all that is ok then it is the fan relay, whitch is the most common problem. it is located on the left front
frame rail. kinda behind the air filter box. it has a four pin connector. be sure to coat the new one with the thermal paste good. clean the mounting surface as well as the bolts of any corrosion. hope it helps

Jan 19, 2013 | 1997 Plymouth Voyager

1 Answer

Cooling system fan don't come on

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  • Check if it is getting power. Check fuse No. 34.
  • Check the cooling fan relay.
  • Run engine to bring temp up then turn off engine, disconnect harness,Visually inspect for pinched wires.
  • Test for power with a test light(have to turn ignition on).
  • If you have power could be a faulty fan (try spinning it to jump start it and see if it takes off).
  • No power could be a faulty sensor or bad wiring.
  • My experience with this type of problem points towards a malfunctioning temp switch if everything has checked out at this point.
  • It's located at lower cooling house, bottom right.
  • To Test that you need to bridge or jump the terminals. If you hold the terminal with the fastener on top and flat side left.
  • Test for power first, Ignition on
  • Left side female controls 1st speed jump them and see if fan works.
  • Right side female controls 2nd speed jump them and see if fan works.
  • If your fan works replace the Temp switch if not. and you do have power check out the fans.
  • if you don't have power chase the wires back looking for a broken, burnt or pinched line.

Jun 11, 2012 | 1999 Audi A6

1 Answer

How to replace a fan relay on a 99 plymouth voyager?

The fan fuse in the 99 Voyager is located in the
under-dash "Power Distribution Center" - the fan fuse is #24 (40Amps - Orange).

How to replace a relay: pull the old one out, then correctly orient and insert the new one.
Its almost impossible to make an orientation mistake, since relays generally can only be
inserted one way (they're deliberately designed to be impossible to insert incorrectly).

Flashers are located either on the bottom of the fuse block or on a module under the dashboard (instrument panel). They are replaced by simply pulling them straight out. Note that the prongs are arranged in such a way that the flasher must be properly oriented before attempting to install it. Turn the flasher until the orientation of the prongs is correct and simply push it firmly in until the prongs are fully engaged.

The 99 Voyager "Power Distribution Center" is located:
Front seating area, driver side, under dash -- see photo below.


For completeness, here's the remainder of the fuse directory for the "Power Distribution Center"


Here's the directory of the Relays in the "Power Distribution Center": Note that
"fan relay" is not one of them.


Photo of location of "Power Distribution Center" - essentially its under the steering wheel.


For completeness, here's a photo of location of the engine compartment "fuse block":


Here's a directory of the 99 Plymouth Voyager engine compartment "fuse block"


These small-ish images can be enlarged by Right-Click"-ing on them, selecting "Save As..."
then viewing/enlarging them using "Microsoft Picture and Fax Viewer," which should open
these images automatically on most Windows computers by double-clicking on the image file.

Sep 14, 2011 | 1999 Plymouth Voyager

1 Answer

I have a 95 accord LX. I've had some overheating problems and neither engine fan comes on. I tested the A/C fan by unplugging it and testing the power to the harness. It had power to the connection. Would...

The AC cooling fan (in some cars) is tied to the operation of the AC only. Others are used as auxiliaries even when the AC isn't in use. Your normal fan is likely controlled by a thermal switch located in the bottom tank of the radiator and these are not uncommon failures, not terribly expensive or difficult to replace. It may be sloppy, but it is safe to leave the battery connected but the key removed when doing this; there won't be power to the connector if the engine is cool.
Check the lower radiator tank for a largish hex-headed sensor with one or two wires coming from it. It (or they) will be plugged into a mating connector. With a container to trap lost coolant (it can poison animals) and a tight cooling system, these switches can be removed and quickly replaced with little coolant escaping. Use Teflon tape on the threads of the new switch and do not over-tighten the switch when installing.

Sep 05, 2010 | 1995 Honda Accord

1 Answer

Engine cooling fan not running checked fuse ok

I would check the fan first disconnect the electrical connectors on it and use a pair of home made jumper cables and run it from the battery. If it works move unto relay if it doesn't you've found the culprit.
Next check relay in the fuse box. Coolant tempertant switch and its circuit aka thermal switch in the water jacket by the t-stat.

Apr 02, 2010 | 1994 Saturn Sl

2 Answers

Fan continues running after turning off ignition

HI. This will, generally, be the result of the cooling fan switch.

The cooling fan switch on most electric fans monitors coolant temperature signals from the engine control computer. When the engine is cool, the switch opens to keep the fan from spinning. When the engine is warm, the switch closes, thus, turning the fan on for cooling.

I would advise to Inspect the cooling fans(thermal switch),wires and connections. Cooling fan switch problems are often caused by faulty wiring or loose or corroded connections rather than the failure of the switch itself. If the wires or connections are bad, replace them. If you think the switch is defective, it should be tested.

The electric fan cooling switch, or thermal switch, can be tested by placing the element in a bucket of water. Heat the water to approximately 207°-216°F (97°-102°C) and connect the switch leads to an ohmmeter(make sure to keep the switch leads out of the water). 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.

NOTE_The thermal switch is located on the top of the radiator, usually on the passenger side.


Dec 16, 2009 | 1998 Volvo C70

1 Answer

98 Celica overheating problem

c7d7b55.jpg Cooling Thermostat.
Look along the radiator hose where it enters the engine. This controls the water temperature.

toyotacelicathermalfanswitch.jpgToyota Celica Thermal Fan Switch The Toyota Celica thermal radiator fan switch is usually located in the radiator or the engine block and has 2 or 3 wires coming from the unit. The 3 wire switch has a dual sensor for dual speed radiator fans. The Toyota Celica thermo fan switches come in the factory temperature settings and also come in cooler thermostatic settings so the fan will come on at a lower coolant temp.

The Toyota Celica cooling system is made of aluminum components and requires a Phosphate free coolant. DO NOT PUT an over the counter antifreeze in your Toyota Celica, as it will ruin the radiator and water pump.

Feb 19, 2009 | 1998 Toyota Celica

1 Answer

Radiator cooling fan doesn't come on.

first unplug the cooling fan at its plug and supply 12v to the fan if it doesnt run then replace if it does run follow the power wire to the thermal water switch usualy located at the bottom of the radiator.Use test light/probe to check that you have power into the switch and when engine is hot you should have power both in and out of the switch.if not replace thermal water switch.If that is working you will need to find out why you have no power to the switch.Check that your fuse and relay is working correctly.Sometimes just pulling out the relay and putting back in will make it work due to poor contact.Also try swapping relays with others in the same box near battery to identify if relay is faulty

Oct 27, 2008 | 1990 Buick LeSabre

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