The Starter motor can keep running because of a number of things. It receives its power from the large contacts (switch) in the starter solenoid. WHen engaged, this starter sol. allows high current 12 volts to run the starter motor.
A number of things can cause the starter solenoid to stay engaged:
A) stuck starter solenoid mechanicals. probably not the cause
B) more likely a defective start position on the ignition switch in the ignition switch
C) possibly a gummed up ignition key tumbler
I would start troubleshooting with a schematic. Make your own or purchase a service manual. IF you pull off the wire from the switch (in the center console) which actuates the starter solenoid, and the starter motor continues to run, then its not the switch or the key tumbler. its the solenoid.
Troubleshooting is the logical process of elimination.
SOURCE: How to change a water pump on a 1999 Buick Century 3100?
the water pump on the 3.1 isnt to hard to change ...
SOURCE: where is the water pump in a 1999 buick century
The water pump is on the top. While facing the engine (front-wheel drive), it is the closest part to you that is on the belt. It is in front of the power-steering pump (slightly lower).
SOURCE: how do I change the fuel filter in a 1999 Buick Century Custom?
Philly, the fuel filter is attached to the frame in front of the gas tank, under the driver side of the car. You must relieve the pressure in the fuel line before you start, and it is also recommended that you disconnect the neg. battery cable. After disconnecting the neg. cable, remove the gas cap. Next, look under the hood on the fuel rail for a shrader valve (like the type on a bicycle tire). Place a rag under the valve, remove the cap, and press the valve in with a plastic pen to relieve the pressure in the line. You can now go under the car to remove the filter. You can disconnect the fuel lines easily with an inexpensive plastic disk made for this purpose (only a few $ for several sizes at a parts store). Be careful of fuel in the line that will drain out, no smoking or sparks during this procedure. Should be 1 bolt securing filter to frame. Note arrow on new filter, and install in the correct direction. Replace cap on shrader valve, put gas cap back on, reconnect battery cable. The low coolant light is probably a faulty sensor signaling that it's low, when it's actually ok. Look for wires coming from the reservoir bottle, you should be able to find the sensor at the end of the wires to replace it. If you change the fuel filter in a garage, leave the door open for air circulation, gas fumes can explode easily, having the door open will help dissipate the fumes.
u need to buy the special coolant to your car i have the same car whit the same problem and is cause to the incorrent cooland the cooland to your car is the DEX-COOL if u dont find that u need some hit (silicate-free)
SOURCE: 1991 Century Buick V6 starter replacement.
remove the positive battery cable from the post
remove the 3 wires from the starter and the two bolts holding the starter to the block.
reverse the procedure for installation.
Testimonial: "I know that there is usually only 2 bolts to remove a starter. I've identified one bolt but was not sure about the location of the other one. Thanks"
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