Mechanics

98 RADIATOR FANS

1998 Plymouth Voyager

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I see someone has already posted a similiar question and got no response. Seems that no one knows the answer, but I will ask anyway.

What activates the radiator fans on a 98 Voyager. It can't only be the engine temp. My a/c head press. Goes over 400 psi and the fans never turn on. Should'nt they come on based on head pressure, or whenever you turn on the a/c? I have checked the fuse and it is fine. I found the relay, but I am not sure how to troubleshoot it. Any help would be much appreciated.
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Lwarren01
August 24, 2006.



I dont have my manual right in front of me, so I cant give specific information but I can get you started.

I am having cooling issues with a 98 Breeze I am chasing down as well at this moment.

You didnt note if the fans work when the engine is hot.

There should be a 40 amp fuse under the hood in the power distribution block. You said it was good, but just checking.

There may be 2 relays - a high speed and a low speed. Both my relays are identical, so I swapped them with each other for testing reasons. The relays should be close to the power block under the hood. On my breeze, they are located above the power block under a seperate lid.

My cooling fans were not working at tempature, but they did work when the AC was turned on.

If your cooling fans are not working at all, you need to test the fans by jumping them with 12volts to see if they are in fact working.

Disconnect the harness on the wires going down to the fans.

On the fan side of the harness (the male terminals), you may have 3 or 4 wires. 2 should be colored, and the last one (two if a 4 wire) should be black.

Using a fused jumper wire, you need to put 12 volts to one of the colored wire terminals while grounding one of the black wires.

Make sure your fingers/hands are clear of the fans!]

You should use fused jumper wires as you do not want anything shorting if you accidently ground the hot jumper wire, or if the fans have an internal short you may not know of.

(I used wires with my portable 12v jump pack as I know it is short circuit protected. : Wink: Any short of the cables and it turns off)

Test the fans first, even swap the relays if they are the same and try running the AC to see if the fans come on. I think it would be odd for both relays to fail at the same time, so unless they both are bad, the fans should come on when the AC is engaged unless the fans are bad.

If the fans work, it may be the relays, fuse, coolant temp sensor or even the pcm.

I have the relay testing method, but the manual is at my shop.

Ill post the testing method tomorrow night, as the relays should be the same.

Tiny
Scfamily
Aug 24, 2006.
Thanks for the info. I believe I only have one relay. It has four wires going to it. A few weeks ago the fans stayed on and ran the battery down. My wife got it jumped and got it home, the fans were still running when I got home so I unplugged them. When I plugged them back in when I had time to look at the car the first fan I tried to plug in tried to start for about one second. I plugged the other one in and it did nothing. They have not worked since. I am thinking know the relay must be bad. I switched the 40 amp fuse with the 40 amp ignition fuse and they still would not come on.

Tiny
Lwarren01
Aug 24, 2006.
Relay testing procedure - I hope yours looks the same as what I have here -

Image -


http://img87.imageshack.us/img87/9407/relayof0.jpg



There should be continuity between A and C.

No continuity between B and D, unless 12 Volts is applied to A and ground applied to C.

When 12v is applied to A and ground to C, You should hear the relay click.

Hope this has helped..

Tiny
Scfamily
Aug 25, 2006.
I also have a 98 plymouth voyager and neither of my fans come on, My engine light stays on and I've replaced the fan relay circuit, the temp senser and still the fans won't come on, I checked the fans with 12v and they kicked on but not when van is running or air. I'm at a lost. Thinking about direct wiring and putting on a toggle switch to use when running air.

Tiny
Missy1948
May 2, 2007.
Check your freon! I had the same problems and put freon in and fans came on! Good Luck

Tiny
Missy1948
May 4, 2007.