My AC keeps blowing fuses. Everything works, but I was told it was the AC control switch that needs replacing. Will I need to buy the whole panel ? The heater works fine, but the AC and defrost buttons don't. I am in Houston Tx......Does anyone know if there another way to fix it or where I can get a new or used one..............

SOURCE: Relay center location

Finally located the AC primary small relay in the relay center under the right dashboard site. The relay had burned winding and only the resistor connected parallel to the coil was showing some resistance otherwise it wasn't engaging when I applied power to it. The Buick is actually 1990.

SOURCE: blower not working on ac or heater etc.

A very common solution here is replacement of the blower motor resistor. The resistor when they break do one of two things.

A. work only on high

B. dont work.

This item is located on passanger side under dash and is usually held in with two small bolts on either side with an electrical connector seperating the mounting screws. It is mounted right in the air box. I replace at least one of these a week in my shop very common item.

SOURCE: HEATER LIGHTS IN CONTROL PUSH BUTTONS ON 200 BUCIK LESABRE

I finally replaced the Backlights, using a guide from a person at www.answerbag.com
who wrote:

(i've got an 04 limited. i just soldered in new bulbs for the lighting controls panel (5 #272-1092) and the digital HVAC panel (1 #272-1092 and 5 #272-1154). steering wheel control bulbs are next. )

Just buying a cheap Used one may be the best, if you are not good with dis-assembly and soldering small electric bulbs
Depending on the style you can get a Used One from an online junkyard for 25-50 USD
Check LKQonline out..
http://stores.ebay.com/LKQonline

The most difficult part is getting the Climate Control Module out of the dash, to make the soldering new bulbs repair. The wood-grain Bezel needs to come off, BE CAREFULL, its long and flexible and can crack easy if the wrong pressure is applied or its cold outside or cold in the car cab. Its held in the dash with GM friction clips ( pain in the %$#) and 2 Phillpis screws behing Glove Box door. I worked the pull- pressure from the A/C vent on Right, left-ward to the center, and from Steering Column right-ward toward the center. Once the Bezel is removed, the Climate Control Module is seen, with 4 push-tabs on each corner. BE CAREFULL pushing in the tabs....I broke off one as in pushed too hard. Pry out Right side while pushing 2 right-side tabs gently together. Repeat for the Left Side, while pushing 2 left-side tabs together gently. The Climate Control Module should pop out. Use a 3/8inch Nut Driver to remove the headless screws that hold the Climate Control Module PushButton plate to the box. This will expose the Printed Circuit Board for solder replacement of the Bulbs.

SOURCE: 2007 Dodge 2500 Mega Cab No Heat, AC, Defroster, Vent fan

possible faulty heater resistor block or control head

SOURCE: A/C blows cold on floor and windshield, not thru dash vents

This recently happened to my mustang and I found a broken vacuum line that connected to a "vaccum block". I'm not sure of the name but if you follow the vacuum line from the master cylinder it will lead ya right to it!