1. blower motor does not work any speed
hooked blower directly to battery works great
removed 25 amp fuse from fuse block with engine running and check with test lamp it does not light lamp on either side of removed fuse
2. buzzer control goes constantly
3. radio does not light up to show station and FM channnes sporadic
If you know the fan works with direct battery voltage and you have no voltage at the fuse block then you have a problem at the fuse block. You need to remove it and check for corrosion or a short. This could also have something to do with your radio and buzzer. Pull the fuse for the radio and remove the buzzer and then check to see if your test lamp lights across the 25 amp fuse opening for the blower.
Also with fuse in place check for voltage at the yellow/brown wire going into the blower motor switch. Just cover all your bases before going at removing the fuse block.
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Would seem your into the inner doors & have a partial
grasp on things
Now you fix all door windows one shot
#1 Test all switches,ohm meter unplugged or volt meter with power
#2 Test all motors with battery voltage direct -- DC motor will run either direction-- can't hook up wrong
#3 Window Regulators -you know about them (Unless they are broken-you said they are tight)
#4 Do you have good ground side wiring & battery voltage at all
switches & motors
#5 Last resort--unhook the cables & work on freeing up the
glass & window guides etc then you will have found out if the
regulators are the issue
It is mounted on the fire wall in a block of two or three relays depending on what equiptiment is standand in your vehicle.Its toword the left side near the ACand the blower motor units Like i said it depends on what you have some are intergrated into the motor . But if you have splice # S108 the goses to the relay and splits and goes to blower motor resistor unit then its the one on the far right hand side of the block. There all interchangable and work exactly the same. However the blower motor relay directs bat voltage to the blower motor olny at blower high speed setting.The blower motor resistors direct battery voltage at all other speed settings. S o in a nut shell if it works on high the relay is good and its the resistors or a connection issue. Try the connections first thats the most likely problem if you olny have high speed
The Blower Motor Resistor also called Manual Temp. Control resistor), is fried, replace. The price with floor console $25 and without floor console $65. here is a pic.
the resistor is located on the blower motor housing, fastened by two screws. It is the part where the electrical plug connects, the plug on the pic. goes to the blower motor.
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Usually if you loose all the blower speeds except for high then the blower motor speed resistor is to blame. This device reduces the voltage that is supplied to the blower motor so you get the slower speed of 1,2, and 3 but is bypassed for the full voltage direct powered high speed which is why the high speed will continue to work.
If things aren't running, about the best way to check the resistors is to find them and remove them... A visual inspection should tell you alot. Resistor wires that look like they have bubbled, scorched or cracked are a sure sign of failure. What is odd though is that typically if the resistor is the defective part, high speed will still work since it usually bypasses the resistor and goes direct to the fan motor... hmmm. About the only issue I've run into with blower motors is that the brushes will wear down to nothing and there's no way of applying power to the motor. But the only vehicles I've ever encountered that on were really old. Unless Buick put in some real trash brushes, I can't imagine a person being able to run the blower long enough in 4-5 years to cause them to be eaten up like that. I hope things work out for you.