Yes, I have a 1968 buick skylark custom. As of last summer my air quit working and my heat. From what I've come up with is every time I start the car it blows the fuse to the a/c and heater controls. This could possibly be a bad blower motor or a bad blower motor speed selector. My question is how can I go about trouble shooting this? And if it is the blower motor switch does anyone know where I can find one of these? I have tried every auto part's store and yearone ect..
I use the process of elimination to find a short circuit like this. Studying the wiring diagram for your car helps a lot. I like to take everything out of the circuit and then add the loads back in one at a time until the fuse blows. Unplug everything, blower speed switch, blower relay, blower speed resistor, compressor clutch coil, and plug them back in one at a time. When the fuse blows, you have narrowed it down. Investigate further. The constant shorts are usually easy to find. The intermittant ones are not. Shorted motor seems likely but it could be lots of things.
Well I had the problem fixed today, but not really the way I wanted to. I ended up using a toggle switch to turn the blower on/off meaning it can only go on high. It ended up being the blower was pushing to many amps and fried the switch. Is their any place to buy blower switches for a 1968 buick skylark custom with a 5.7? No one that I can find seem's to carry them?
Assuming none of the regular Buick suppliers have it, the parts wanted section would be a good start. Also ebay. Have you tried CARS Inc?
Well unfortunately today I was messing with the a/c moved the selector to a/c and the underneath of my dash caught on fire, for some reason the fuse didn't blow and ignited some of the wiring/switches. And to think everything worked fine a year ago:S
Have you tested to see if the A/C Clutch is "fried" ? If you have an old pigtail fuse holder ,say from an old car sereo ; put a 10-20 amp fuse in it , disconnect the plug going into the A/C clutch , attach one end of the pig tail to battery voltage and the other to the positive side of the A/C clutch then ground out the other terminal to a ground source . If the fuse blows that's a good place to start of not start following the wires up to the switch . I don't which side on the clutch would be your hot side . Youd need an Ohm meter to check out for an open or ground . Or , use an Ohm meter , disconnect the wire term from the clutch and ground one end of the probe to a ground source and the other to each terminal and watch the meter or needle . If the circuit is "open" the needle or the digital read-out won't change or move . If it does then there's your problem . The needle or read-out will go to Zero Steve
