Cooling fan won't run P0480

PELT7358

MEMBER
1997 CHEVROLET CAVALIER
215,000 MILES

I have tested the fan, relay and changed the temp sunsor with a used good sensor. If I jump the relay out the fan runs, I have power to the relay coil but it doesn't have a ground through the control module.

Sunday, September 11th, 2011 AT 11:13 PM

3 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

The computer needs to see the temp of the motor to turn it on. The coolant sensor provides the info. You need to have that checked.
Does it work with the ac on?
Let a shop use a scanner to verify the pcm is seeing a signal.

Roy

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Sunday, September 11th, 2011 AT 11:16 PM

PELT7358

MEMBER
2 POSTS

The AC douesn't work and the temp gauge inside the car works properly with both sensors I tried. Is the gauge and computer seperate but off of the same signal.

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Sunday, September 11th, 2011 AT 11:32 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

The coolant sensor is different than the temp sensor for the dash it is located by the thermostat housing and has 3 or 2 wires on it. It is cheap for the part and you may want to try this first before taking it to a shop for a bid.

Roy

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Monday, September 12th, 2011 AT 12:18 AM