Question about 1999 Plymouth Grand Voyager

1 Answer

Radiator Fans 1999 plymouth grand voyger

My radiator cooling fans will not work, I can,t seem to figure out this problem, I could not find the sensors or are there sensors that controls them? I have temporarily ran a hot wire from the fans to battery to a toggle switch please help me out. thanks.

Posted by on

  • 3 more comments 
  • heavy-e Aug 21, 2008

    Thanks Frank your advise was most helpful, the ts was my problem all along, my rad fan are now working fine,thank again. heavye.

  • donaldnasty Aug 30, 2008

    my rad-fan is not coming on and my car runs hot

  • dembishack Dec 09, 2008

    how do i take it out and put my new fans in my radiator already blew up because of this my fans just stoppend working and now my van over heats i am not going to blw up the engine i need help putting in my new fans grrr

  • Anonymous Jan 07, 2009

    fans not running on 99 plymouth van have check every thing thanks

  • JJonathan Feb 12, 2009

    My van overheats when I'm idling, but not while driving. My fan won't come on.

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

  • Expert
  • 72 Answers

My answer:

I answered a similar ? at Yahoo Answers awhile back, and it solved that person's problem on their 1987 Jeep.

Though you weren't very specific as to your 2003 Jeep Grand Cherokee's problem by just saying the fan motor doesn't work, I'm taking it that we are talking about the "radiator fan motor" here.

You most likely have a two-fold problem going on with your radiator cooling fan.

Seeings a new fan motor didn't solve the original non-op problem we can definitely establish that the old fan being bad really wasn't bad at all and NOT the problem to start with.

As with any 12-volt DC automotive motor (whether for the radiator cooling fan, windshield wiper motor, interior passenger compartment cooling/circ fan, etc) a simple disconnected from the car's electrical system test should have been done 1st to make sure the old fan motor was really bad. Too late for that now though. I myself would have seriously doubted that a 6 year old fan motor would have been bad already.

If you had no recent engine or radiator related mechanical work done to the Jeep - as of late - then the problem may not even be a bad wiring harness connection, but you never know.

If all the radiator fan Temp related Sensors & Thermal Switch connectors are properly seated then we need to look at yet another possibility having eliminating a wiring connector type problem.

On most radiators with an electric assist fan(s) there is also an electric Thermo Sense switch (TS) mounted on the radiator itself that has to be working properly otherwise this fan switch could stick in the CLOSED position (set point usually 190 degrees F) leaving the fan to run all the time while the engine is running. Make sure it is connected as to the wiring connector, as I've seen this connection get pulled apart from other engine related work being done or else from a bad connector itself.

If this TS goes bad and someone disconnects it so as to stop the fan from running all the time - then it may look like the fan itself is bad when it really isn't.

On the other hand this TS switch could actually stick in the OPEN position (though this is very rare with this type of Thermal switch), and then the fan wouldn't run at all, and the engine would probably run HOTTER then normal as a dead giveaway. If your engine is running HOTTER then normal I would go directly to this TS and check it for proper operation. It's usually mounted on the radiator fan bracket nearest the radiator with a separate 2-wire wiring connector.

If it's working properly - when the ignition is turned off - the fan should still turn off as it is usually controlled by a timed RELAY circuit as a failsafe. Does it??

Hopefully you don't have any engine cooling problems to start with, but if you do follow the guidelines below:

If the engine thermostat is sticking CLOSED, or indeed stuck CLOSED, that could also cause the fan to run excessively. Running plain water in the engine and not proper 50/50 antifreeze/coolant mix can also cause the engine to run much hotter then normal and thus adds to running the radiator fan more frequently then normal.

Excessive radiator fan running leads to just one thing, and that is worn out bearings. Some of these fans aren't made that good to begin with!

If the fan is indeed 'tired' or has a tendency to try and freeze up there should be safeguards to prevent wiring from burning up.

Most radiators have 2 thermo-switches (TS), one being an ambient radiator surface mounted TS, and the other one being an internal (screwed into) radiator mounted TS. There might even be a 3rd fan TS that is clipped directly to the fan motor case itself to sense an over-temp situation like that from the fan bearings freezing and the fan itself running hotter then normal. Just depends on car maker design.

There is also a TIMER RELAY module incorporated in all CA equipped cars as part of the SMOG packaging for cars sold here in this state. Reason for that is to reset the pre-warm circuit properly when restarting the car back up after shorter run and stop trips. If this relay is bad it could cause the fan to run on longer then normal after shutting off the vehicle, thus causing undue wear and tear on the fan motor also. I used to think it also helped to clear out any fuel fumes from under the hood after running the engine, but could never prove it or have it verified by my own minivan maker when I owned a minivan??

NEVER DRIVE THE JEEP WITHOUT THE FAN MOTOR BEING CONNECTED!! You will surely damage something you don't want to!!!

To check the radiator fan circuit do the following:

I would first disconnect the battery from the circuit, and do any resistive type DVM meter checks first (unless you are unsure of how to do them), and then do the following checks below to check out the fan motor and related sensors/switches with power reconnected. If you have a lot of MEMORY type devices onboard your Jeep (Stereo, GPS, etc) you might want to use a simple 12-volt TEST LIGHT or again a good DVM to trace for a good ~12-volt battery voltage at point-to-point connectors instead, so as not to lose those memory settings.

First check the wiring leading to and from the fan motor itself and the TS (1 or possibly 2) connectors to make sure they are snapped together fully and making good connections. Also check the GROUND WIRE coming off the fan motor connector - as if this ground point is dirty or corroded causing a bad ground return path then the fan motor will appear to be dead as well.

Next check the fan itself for free-play. Is it turning freely or is it very tight or hard to spin?? If so - you have a bad fan and it's time to replace it NOW! (In your case it doesn't appear to be a bad fad fan motor at all.)

If you are handy with a digital volt meter (DVM) connect it in DC series with the fan motor and while running the Jeep measure the current and compare it to a new fan's rating. If it's excessive then the fan motor is on it's way out. Time to replace. (Skip this part too, as your fan is known good.)

VERY IMPORTANT STEP HERE - Also check those 1 or 2 TS switches to make sure they are in the OPEN setting with a COLD engine/radiator. CHECK AGAIN to make sure they CLOSE at the proper engine temp as well. If they don't close at or near 190 degrees F then one or the other (if there are 2 or more in your system) may be bad, and that may very well be your only problem.

If Jeep has added a FUSE or FUSIBLE LINK to the fan circuit make sure you check that part also. It's doubtful though, as the fan circuit is fairly simple by design. A Timer Relay type Switch would be downstream of the/any TS switch(es) by design as well, so I would place my money 1st on a bad TS switch, or a possible bad ground connection 2nd.

Does not appear to be anything else that excessive as it looks to just be isolated to the radiator fan circuit itself.

Hope this helps you out to troubleshoot the problem. Feel free to email me if you still have further ??'s.

Frank

AND THEIR REPLY WAS:

posted by djvanh on Aug 13, 2008

We are being told that it is the PCM that is causing the fan not to work. Can we replace the PCM with a remanufactured one?

Thanks

AND MY REPLY WAS:

I guess I better ask you a couple of ?'s before going any further here - as I'm not getting back any feedback at all as to what I posted previously.

No past history - no past to present attempted fixes - no troubleshooting feedback.....

The reason I say this is because now you are saying > We are being told that it is the PCM that is causing the fan not to work.

This has me asking - WHO is telling you that the Powertrain Control Module is supposedly bad? By WHO I mean - Jeep dealership - auto repair garage - your friend - who?

I need to know what steps you took to get to this new revelation point - as to the fan supposedly not working?

Please be very specific, and not just a 1 or 2 line reply - as that won't help me pinpoint the problem at all. After all - you have the SUV there (wherever you are located state/city wise), and I don't.

Also - do you have the/a service manual (Haynes or Chilton Auto Manual for your year & make Jeep)?

When I get your feedback we can proceed forward.

Thanks,

Frank



1 - Highly degreed in Electronics first of all.

2 - Worked for 2 SEARS AUTOMOTIVE STORES, one on the East Coast and the other one still being the largest SEARS AUTO in CHICAGO at 6-corners. I specialized in troubleshooting all auto electrical problems - including battery testing and charging system testing and repair. Graduate of DeVry in Chicago also!

3 - Troubleshooted, repaired, and replaced many water pumps, thermostats, fans, TS units, and radiators on all types of vehicles and makes and models. I hate those stupid internal water pumps on many of the *** Honda and similar autos as that is the dumbest design I've ever seen! Stay away from buying one of these headaches!! Timing belts (non-metal type) are just as bad!

Posted on Aug 21, 2008

  • Frank JR
    Frank JR Aug 25, 2008

    Heavy-e,



    Thanks for the feedback as to the T/S Sensor being bad and being the
    only cause of the fan problem, and glad I was able to help you get the
    problem fixed!!



    Happy driving!!



    Frank

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Radiator fans randomly shut off


  • Relays carry high-amperage current controlled by a low-current switch
  • When a faulty relay is not replaced, the circuit will either be non-functional or remain engaged. here's your relay you need.
http://www.autozone.com/cooling-heating-and-climate-control/relay-radiator-cooling-fan-motor/duralast-relay-radiator-cooling-fan-motor/oldsmobile/alero/1999/4-cylinders-t-2-4l-sfi-dohc/221833_0_0

Aug 16, 2015 | 1999 Oldsmobile Alero

1 Answer

1999 grand prix gt overheating. Changed thermostat, water pump, upper radiator hose. Please help!


does the upper and lower hoses seem to be the same temp when car begins to overheat? ore the radiator cooling fans coming on before the car overheats? did you pressure test the cooling system and radiator cap? also may want to remove the lower hose and flush the radiator. is the check engine light on and does it run bad?

Aug 03, 2011 | 1999 Pontiac Grand Prix

1 Answer

My 1996 grand prix started to register cooling temp of over 210 degrees. the motor doesn't seem to be overheating. I've replaced the water pump, thermostat, temp sensor, both fan relays, low coolant...


I would first check the cooling fans. To do this unplug the fans and use two jumper wires to hook them direct to the battery and test. If the fans are working I would have the radiator cleaned or purchase a new one. To clean the radiator take it to a professional and tell them you would like it rodded out. You can purchase a new one for about twice the price. I wouldn't worry about the low coolent sensor. By it being on it will not send a message that your vehicle is overheating. If you have changed everything that you say you have and the fans work and radiator is cleaned you may have a blown head gasket. If you have a blown head gasket you would see steam comming out of the tail pipes or water in the oil on dip-stick. Good luck.

Feb 20, 2011 | 1996 Pontiac Grand Prix

1 Answer

Radiator Cooling Fans won't run. Not seized up.


EIther fuse, relay, fan motor itself, temp sensor, or bad wiring

Oct 29, 2009 | 1998 Plymouth Grand Voyager

2 Answers

1999 plymouth grand voyager overheats when the ac is on


when the ac is on the computer is looking at pressure in the ac system to control the cooling fan operation if the pressure is increasing the cooling fan is commanded on now if the pressure switch is bad or if the ac system is low on refrigerant it is not building pressure and the cooling fans are not going to come on.

May 11, 2009 | 1999 Plymouth Grand Voyager

2 Answers

1996 Grand Voyager 3.3L Over Heats


Dodge Caravan is notorious for failure of the electronic cooling fan control module (AKA cooling fan relay). This is not a "relay", it is a solid-state control unit, but many people call it a relay anyway.
It is mounted on the inside of the left frame rail just behind the radiator. You have to look up from UNDER the vehicle to see it. It looks like the picture below. The picture shown is very close to actual size.


12_4_2011_10_30_47_pm.jpg

May 10, 2009 | 1996 Plymouth Grand Voyager

1 Answer

Fans want turn on and the 1999 plymouth grand voyager over heats.


the cooling fan module is located under the air cleaner box on the radiator core support. very common problem .it is flat and about 3 inches long held on with 2 5.5mm bolts.

Apr 22, 2009 | 1999 Plymouth Grand Voyager

1 Answer

1997 plymouth voyager radiator fans


I don't believe your particular vehicle's cooling system needs to be bled during coolant filling, but check the coolant level first. It seems that the coolant level is too low for the sensors to be able to sense the temperature, or the sensors are disconnected. Look for a connector on the intake manifold, near the coolant outlet. Ensure it is properly connected.

Aug 16, 2008 | 1997 Plymouth Voyager

Not finding what you are looking for?
1999 Plymouth Grand Voyager Logo

1,425 people viewed this question

Ask a Question

Usually answered in minutes!

Top Plymouth Experts

yadayada
yadayada

Level 3 Expert

60792 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

Are you a Plymouth Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...