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Old 06-15-2010, 07:00 PM   #1
plinker
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Default '99 buick century, cooling fans not working

Over the last week I have been replacing the brake lines (all) and the gas lines on my Grandmothers car ('99 buick century, 3100 V6).

Finally got done yesterday evening, everything seemed to be working fine except the cooling fans were not coming on the gauge was halfway between cold & hot and the hoses were hot. So I figured the thermostat was not stuck as the coolant was circulating.

Today I checked over the fuzes and checked the connections for both cooling fans and couldnt find anything wrong . They were working fine before. I am not sure what to do, as far as I know I did not disturb anything.

Any Ideas??
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Old 06-15-2010, 07:02 PM   #2
Jay H 237
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Default Re: '99 buick century, cooling fans not working

Is the wire on the temp sensor? Maybe it was knocked off while pumbing the brake lines in the engine compartment?
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Old 06-15-2010, 07:36 PM   #3
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Default Re: '99 buick century, cooling fans not working

My mother-in-law has a 96 Cutlass, 3100 engine. The fans will not come on till the engine temp is above 215. Use a OBD-II scanner to verify that your engine is actually getting that hot. I can drive hers around all day if it's cool outside, even let it sit and idle for an hour one time, and never did catch the fans running. Also the guage in the dash on those cars are famous for being way out of whack...not the sending units fault, problem is in the guage cluster.
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Old 06-15-2010, 08:28 PM   #4
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Default Re: '99 buick century, cooling fans not working

do the work with a/c on?
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Old 06-15-2010, 10:43 PM   #5
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Default Re: '99 buick century, cooling fans not working

Checked the temp sensor wire, still attached.

I dont know, it may just run like this but it just seems hot to me. I'm gonna have to get an ODB2 scanner sooner than later, me thinks

I'll try it with the A/C in the morning & see what it does.

Thanks!
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Old 06-15-2010, 11:21 PM   #6
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Default Re: '99 buick century, cooling fans not working

It may be hot to you, but not hot enough for the fans to come on. If you have a temp gun you could verify how hot the system is.
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Old 06-16-2010, 10:57 AM   #7
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Default Re: '99 buick century, cooling fans not working

The fans on my 99 buick pa(same motor) only come on about 225, I've only ever seen them on a few times.
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Old 06-16-2010, 11:10 AM   #8
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Default Re: '99 buick century, cooling fans not working

I put the A/C on max and let it run a little while, after a few miniutes I saw the fans working. My Dad has a temp gun, so I'll check it with that just to make sure the temp. is within reason.

I've never had to deal with electric fans before, so this is all new to me.
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