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cooling fan woes. Searched, tested and inspected everything.

 
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Old 20 May 2014, 02:57 pm
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Default cooling fan woes. Searched, tested and inspected everything.

Okay folks, I've got a 2001 here with a cooling fan that doesn't run. I did some searching and got lots on the cooling fan thing, which helped a lot, but now I'm at a dead end. What's going on:

AC on - no fan action
engine really warm - no fan action
tested relays (2) and fuse (1) - all good
jumped coolant temp sender plugs - no fan action
checked the fan connector for 12v - no voltage (very minor, less than 1v coming through).
jumped the fan connector with 12v - fan runs.

To me, this tells me it's a wiring issue. There were dog food bits in the under hood fuse box. I suspect a mouse chewed some wires in there. Also, my radio display goes on and off, though the radio still works.

What say you?

How hard is it to get the fuse box out?

thanks!
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Old 20 May 2014, 04:34 pm
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Default Re: cooling fan woes. Searched, tested and inspected everything.



A good test of the wiring would be to jumper the socket connections 30 and 87 and see if the fan comes on. You should be able to do this without the key in at all. The diagram above is specifically for the low speed relay. The high speed relay is a different arrangement but the contacts should be numbered the same (30, 87, 87a, 85, 86) and have the same function.
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Old 20 May 2014, 04:38 pm
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Default Re: cooling fan woes. Searched, tested and inspected everything.

Okay, I'll try that next.

If it doesn't work: bad wiring? Considering with 12v jumped to the fan motor it runs.

If it does work: something's not triggering the relay? The relay tested fine (85 & 86 had continuity, 30 & 87 did not. Powered up and then 30 & 87 had continuity)
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Old 20 May 2014, 04:46 pm
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Default Re: cooling fan woes. Searched, tested and inspected everything.

Looking at the Mitchell Repair Information Company, LLC 1998
electrical schematic, I see that there are two fuses in the system.
The PDC (under-hood) fuse # 5 (40 amp) protects the power to the radiator fan through the relays.

The dash fuse block #12 (10 amp) protects the relay coil power at both relays.
The relay grounding is through the PCM.
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Old 20 May 2014, 05:29 pm
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Default Re: cooling fan woes. Searched, tested and inspected everything.

Try this. Pull the High Speed Relay Turn the engine on. Does the fan run? I believe there is a fail-safe for the relay circuit.

I'm asking because my 05 Limited Turbo is giving me the same problem as you have. This past Saturday, I tested things quite extensively. I've also tested the sockets with cont. tester. Also, when I jump the relay socket as suggested above, I can get high and low working. Both relays installed, I get nothing. Wife picked up a new relay today. I plan to install it this evening.
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Old 20 May 2014, 05:39 pm
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Default Re: cooling fan woes. Searched, tested and inspected everything.

I forgot to mention, I had checked the under dash and under hood fuse as well. All appears good in that regard.

I did jumper the sockets for 30 & 87, no fan action.

NIL8R - I have not tried this but I will give it a shot.
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Old 20 May 2014, 05:39 pm
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Default Re: cooling fan woes. Searched, tested and inspected everything.

You can test the connector between the fan and relays, it has three wires, the center is ground. Visually check the female connector for sign of heat-melting-brown-black around the actual metal connectors inside the harness connector.
With mine it showed a ground but with heat damage to the female connector it did not make contact with the male and I had no fan.
OR get rough
Pry off the contact cover and push down on the contactor with the key on and see if your fan comes on. IF you haven't changed the fan motor or the fan already it certainly due at 100000 miles.
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Old 20 May 2014, 07:52 pm
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Default Re: cooling fan woes. Searched, tested and inspected everything.

NIL8R - I tried removing both and 1 at a time and no luck with the fan.

JoeX - the wires I checked were in the battery end of the connector, not the fan side. I dont think checking the way you described will be different. I tried it both with the car off and running with no difference.
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Old 20 May 2014, 08:49 pm
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Question Re: cooling fan woes. Searched, tested and inspected everything.

Quote:
Originally Posted by traikun View Post
Also, my radio display goes on and off, though the radio still works.
Question #1....When you push the key in does the radio display come on?
Question #2....Does the radio display come on if you tilt the steering column up or down?
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Old 20 May 2014, 11:17 pm
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Default Re: cooling fan woes. Searched, tested and inspected everything.

I'm so frustrated by this. New High Speed Relay did not help my situation. In fact, now jumping the realy socket no longer runs the fan either. I had little time this evening to work on this. I plan an testing the connectors and wiring next. BTW...TURBO models have different connectors at the fan. Still looking for pinout of connector for Turbo model fan terminals.
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