Caravan/Voyager :: 1998 - Engine Cooling Fans Won't Go On
May 12, 2008
I have a 1998 Caravan and the engine cooling fans wont go on. Ive replaced the relay and the temp sensor. When I pull the connector off the temp sensor the fans go on so I know the fans and fuses are fine. For some reason it seems the computer module isnt sending a signal to the relay to turn the fan on. I get the trouble codes P1491(radiator fan relay circuit fault) and P0118(engine coolant temp circuit high input).
I am also having a problem with the air conditioning not working. When I do the self diagnostic test on the A/C the results are that it fails the cool-down test. Why the computer module isn't sending a signal to the relay? Could the A/C problem be causing the cooling fans not to come on?
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So my radiator fans were staying on until my battery died and my car was completely cooled down and off. I was told it was a sticking relay so I replaced it and the fans still won't come on. I unplugged the coolant temp sensor and the fans came on so I know its not the motors or anything.
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I have a 2000 Dodge Grand Caravan that has 195,000 miles. My radiator fan won't turn on and I'm stumped! The issue presented itself with a check engine light and the radiator cooling fan not turning on. The trouble code indicated the cooling fan relay was faulty. In all cases below, I tested the radiator fan by turning on the air conditioning (thus forcing the cooling fans to run) and also for it to come up to a high temperature coming close to the danger zone.
1. Fuse - first tested the fuse and it was OK. Had to start with simple things first.
2. Cooling fan relay - I replaced the relay which has a reputation for failing on the Dodge. Still the fan did not kick in.
3. Cooling fans - tested the cooling fans and the motor was seized. Replaced the cooling fans and tested them by jumping them. The cooling fans still do not turn on. There is no voltage leaving the cooling fan relay and coming into the cooling fan harness.
4. Wiring - tested the wiring between the relay and the fans. They checked out OK (good continuity and resistance check). There is no voltage leaving the cooling fan relay. Now it's getting more complicated... I unplugged the wiring harness from the ECM and tested the wiring between the ECM and the cooling fan relay. A-OK.
5. ECM - it is unclear how to check the ECM for functionality of the cooling fan.
There are 3 wires (supply, ground, and switch wire?) The supply voltage and ground is good, but I don't know what voltage the switch wire should be. I've read that it is pulse width modulated so I can't measure this with a simple voltmeter. I've also read that the switch wire goes to ground thus triggering the relay. I don't know which is correct. Several mechanics I talked to were skeptical that the issue is with the ECM, they knew of very few instances of this being the culprit. I even replaced the new cooling fan relay with another new cooling fan relay on the off chance that the replacement was faulty. Did I miss something in my logic and diagnostics? I've resorted to wiring a switch directly to the cooling fans and toggling them on and off.
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I have a 1998 Plymouth Grand Voyager SE. It has 122000 mi. I just bought it a few months ago and have came across a few minor problems and all have been easy DIY projects (couple of blown fuses, wiper replacement etc..) Recently, I noticed the AC stopped working (it was only tested once when I bought it, but have not used it since)
Where to begin the diagnosis. Is there a fuse connected to the functioning of the AC? I really don't know a whole lot about cars, but I am pretty good at fixing things in general.
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I took the van on a road trip and the engine seems like it wants to stall at lights. the idle stays at 500 rpm or so most of the time while at stops. there appears to be no way to adjust the idle and there is no Czech injun light on.. what could the problem be? the engine is a 3.8l
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I'm about to put a new tailgate on a 98 Dodge Caravan. I got hit in the back and I bought a new back door at the junk yard. It looks pretty easy, but I thought I would touch base here and there are a couple of potentially tricky parts...
Does that wire bundle have a block somewhere that you can plug, or am I going to be splicing them one by one? (I don't have power locks. I have windshield wiper, back door inside light, license plate light, heat wires in the glass.) The other tricky part..changing the lock.
I think that's all.. the bolts and star screws look pretty straightforward. I got it used with 48k miles a couple years ago and I only have 75k now. It was a government car.
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My father's 1998 Dodge Grand Caravan SE radiator fan runs constantly - even with the ignition off. He has to disengage the battery for the fan to quit running - what might be wrong?
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The battery light came on, alt not charging. I have taken it off twice and had it checked, both times I had it checked it showed good, when I put it back on it charged for a bit and then the light came back on and it showed no charging at the battery. Second time the place checked it they ran the check cycle 4 times in a row to see if it had a problem when the electronics started warming up... still showed all green.
I thought perhaps the wires going to the alt, so I had the wife start the van up and I moved the wires around going to the alt to see if it made the batt light flicker, no joy. (real fun getting your hand back there while the van is running)
The large wire shows batt voltage where it hooks on to the alt, running or not...... the two prong plug that goes into the alt shows no voltage unhooked with the key on, and no voltage plugged in with the key on or running.
I have been told there is a control unit that controls the output of the alternator. I have checked every fuse in the fusebox under the dash and in the engine compartment. Fuseable link on big wire going to the alt should be good as I do get battery voltage to the alt from the battery, correct?
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My wife has been driving our 98 Dodge Grand Caravan the last couple of days and while she is driving the Tachometer and Speedometer will drop to 0. This does not affect the performance of the engine or anything else. Runs and drives "perfect" (or at least for its age and mileage). The dash seems to "reset" when she parks and turns off the ignition then restarts it.
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The heater fan in the van will only work on full blast and the rear wiper/ ac button lights flash which I had another 98 caravan that I was driving that had the same issue with the flashing lights. What is that all about?
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Just changed the battery on a '98 Grand Caravan 3.3. In the process of tightening the positive terminal I accidentally touched the wrench to the negative. There was a spark, of course, but otherwise no biggie. However, now the HVAC indicator lights, including the rear wiper, defroster, etc. indicator lights, all blink continuously until about 15 minutes of driving, then they return to normal. I disconnected the battery thinking that I needed to clear the PCM but the blinking always returns. Is this some sort of manual code reading deal? If so there's no mention of it in the Haynes manual.
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It is as an electronic whistle/humming. The sound is coming from the rear of the van, and no, not when it's moving, even though it still does it when moving. The only thing I can think of would be the fuel pump. Because It's loudest just before the rear tires, not after them. My fiancee has heard it twice now, when she first heard it, I didn't, but this last time when I heard it, I also noticed that the gas gauge was reading just below 1/8 of a tank.
Would like to know if it's the fuel pump or something else I'm no thinking of. And if it means I have to replace the pump.
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My 1998 T&C has a problem where the front passenger window keeps falling off the track (caused by hard slamming of the door).
I've gone into the door multiple times to pop the rear-most peg back into the white plastic window track "dog", but it keeps popping out after moderate door slams. Do the black pegs that are glued to the window wear out? (I think they're metal).
I think the plastic track dog is fine, and I make sure the metal clip is fully engaged with the window peg each time I pop it back in. The only reason I can come up with for this problem is that the window peg is worn down and has lost its "edge" and thus the metal clips can no longer retain it. Sound reasonable? Probably need a new window from junkyard correct?
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98 dodge caravan 3.3L v6 ..... All lights work including driver's side tail lights. only problem is that when pressing brake pedal, the driver's side brake light does not light up. i changed the bulb and checked the brake light fuse under the hood, but it was fine (as i guessed since the passenger side and middle brake lights work). I took the assembly off and reseated the connector to the tail light assembly, but same issue.
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Both engine cooling fans on my 1986 Camry are running all the time; even when the engine is cold.
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1999.5 golf afp engine cooling fans not working at all. fter run coolant pump also does not seem to be working. fcm changed still no luck fans do work when jumped straight to battery.
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My 2001 alero 3400 engine is getting hot again this alero is running with a 2001 impala engine run great for few months, replace radiator, hoses, thermostat and suddenly coolant start leaking in the overflow, fans not working even with ac on, i replace the etc sensor and did not work, the fans turn on when I disconnect the etc sensor so i think the fan motors are ok. I got one pcm module from the salvage yard in case I need to replace it but I read that only the dealer can reprogram the computer system because vin number issues....
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I have a 2004 freestar that cooling fans come on when engine gets to temp but not when I turn on ac it has 5 relays for the cooling fans and they run in series and a dropping resistor. Ithink someone replaced #2 relay with the wrong one and has caused my problem because they did not know what they were doing...
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I start my van and open the hood to check Coolant and I notice gas spilling out engine and running down the side close to my power steering pump. So I stop the vehicle and notice gas sprayed on different parts by the back spark plugs and a little area by sensor.
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I was riding down the interstate this morning and had my cruise control set at 70mph. all of a sudden the cruise just turn off. I went to hit the gas pedal and there was nothing. No check engine light or anything, no spit, no sputter. I pulled off the side of the interstate and attempted to start the van. the engine turns over fine, but no start. all lights, radio work fine. car has fuel. it did not run hot.
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I have a 2005 dodge caravan and today after taking my kids kids to school, I noticed white smoke coming from the hood of the engine. I managed to get home and check it out. With further inspection, smelled like some type of fluid is burning off I can't tell if it's oil or anti freeze. There seems to be some type of condensation in the inside of my van on the passenger windshield. I looked to check to see any leaks inside on the floor mat and underneath the van itself and nothing. What seems to be the issue?
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