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it is located on the right side behind the head light and it is the last relay next to the radiator
In the glove box.
Check at the rear side of the radiator towards the top
under pass seat
The 2001 Buick Century came equipped with the 3100 V6 (engine code 'J'). The cooling system capacity is 11.6 quarts.
On my 93 Buick Century is located behind the left headlight, and it's the fourth relay if you are looking from the inside out. It has 2 thick wires, one red and the other one BLK/RED, plus another two thinner wires, BRN/WHT and DK GRN/WHT
Checkhttp://autorepair.about.com/library/faqs/bl113g.htm
The 1998 Buick Century shift solenoid is located on the top of the transmission. The shift solenoid can be access through the shifting console.
The 1996 Buick Century horn relay switch is located behind the dashboard. The relay switch will be on the drivers side of the dashboard.
fuel filter location
You will find the ICM directly below the coils. Just remove the coils and you will be able to remove it. This is on a 1990 Buick Century V6 3300 engine. If you have a different engine I cannot confirm the location.
check fan relay/fan relay control module