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Old 06-25-2013, 11:47 AM   #1
Partymmudasti
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Default 2000 Lw1 Cooling Fan Saga

My nieces 2000 Lw1 (2.2l 4 cyl) was overheating and I discovered the cooling fan relay box located by the battery was melted. I replaced it. Either of the radiator cooling fans are still not working.

I did test the fans by supplying 12v by hand and they activated, so I know they DO work when manipulated manually.

I have codes P0480 (Cooling Fan 1 Control Circuit Malfunction)

P0481 (Cooling Fan 2 Control Circuit Malfunction)
&
P1640 (Input driver 1 voltage high)

The 30a underhood fan fuses are not blown.

Somebody please help me before I push the car off a cliff, lol.

Last edited by Partymmudasti; 06-25-2013 at 11:59 AM..

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Old 06-25-2013, 12:15 PM   #2
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Default Re: 2000 Lw1 Cooling Fan Saga

Could the P1640 be caused because the check engine light is burnt out? because it is.

Still doesnt solve my P0480 and P0481 though....

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Old 06-25-2013, 11:13 PM   #3
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2000 L-Series 2.2L Sedan
Default Re: 2000 Lw1 Cooling Fan Saga

I'm no wiz at electrical problems , but thought the question should be asked: what is the condition of the connector, contacts, and wires plugging into the fan control module?

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Old 06-26-2013, 06:56 AM   #4
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Default Re: 2000 Lw1 Cooling Fan Saga

Quote:
Originally Posted by pierrot View Post
I'm no wiz at electrical problems , but thought the question should be asked: what is the condition of the connector, contacts, and wires plugging into the fan control module?
Everything looks good - there is no corrosion or loose connections. Plus the relay box is new, to boot.

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Old 06-29-2013, 10:54 PM   #5
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Default Re: 2000 Lw1 Cooling Fan Saga

I gave up. I checked the wiring all the way from where I could reach to the fan relays and couldnt find any shorts or chafing.

I bought an adjustable Hayden fan controller and installed it today. You insert a probe into the radiator fins and run 12v from a switched ignition source to the controller, ground the fan and run a wire to the fan. Guess what? Works perfect now. Comes on around 200f and cools it down to around 185f.

The check engine light is burnt out so the two codes for the cooling fan relay circuit can stay there in the pcm for all I care. As long as the stupid car doesnt overheat, Im fine...lol

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