Clarksville, MD

12411 Clarksville Pike
(410) 531-6116

Columbia, MD

6810 Oak Hall Lane
(410) 381-1124

Clarksville, MD

12411 Clarksville Pike
(410) 531-6116

Columbia, MD

6810 Oak Hall Lane
(410) 381-1124


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Forms and Checklists

If you like to be prepared when you come to your auto repair appointment, feel free to fill out and submit any of the below checklists related to the type of problem you are experiencing. These checklists ask basic questions about the symptoms your vehicle may have exhibited and help our mechanics narrow down what could be wrong with your car.



Air Conditioning Symptoms Worksheet

Air Conditioning Symptoms Checklist

  • Your Air Conditioning System

    Refrigerant: The "working" fluid of the A/C system. The refrigerant transports heat from one part of the system to another. It absorbs heat while turning into gas, gives off heat when becoming a liquid.

    1. Evaporator: The component where the liquid refrigerant vaporizes, absorbs heat, and travels on to the compressor. The "cold" part.

    2. Compressor: Pressurizes the refrigerant gas and pumps it to the condenser.

    3. Condenser: A small radiator that extracts heat from the refrigerant and converts (condenses) it from a gas to a liquid, then transports the liquid, then transports the liquid to the accumulator.

    4. Accumulator/Receiver: A storage tank and filter for the liquid refrigerant. Excess fluid is stored here and moisture is removed.

    5. Orifice Tube/Expansion Valve: Regulates the liquid refrigerant going to the evaporator. Here the liquid again changes back into a gas, cools the evaporator fins and gives off cool air that is blown into the car by the fan. The cycle then repeats itself.

    Compressor Clutch: Engages and disengages the system.

    Refrigerant Oil: The system lubricant.

    Discharge: To vent all system refrigerant.

    Evacuate: To remove all system moisture and refrigerant.

    Performance Test: A complete test of all operations of the climate control system.

    Leak Test: A check of all system components and connections for refrigerant leaks.

  • This field is for validation purposes and should be left unchanged.

If you are unsure about the symptoms, simply try to recall any type of odd behavior you’ve recently noticed from your car. Write it down, so that you don’t forget any details and be ready to answer a few questions from your Maryland auto repair technician. The better you can describe the type and timing of the problem, the faster we can diagnose it.

Need to schedule an appointment? It’s easy—just click here and choose which location you want to bring your car to.

Automotive Repair Specials


Maximizer Maintenance


Includes oil service with filter, inspect coolant hoses, brakes, tire alignment, belts, suspension, steering, struts and shocks, exhaust system and alignment, adjust tire air pressure, top off fluid levels.

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Awards and Recognition

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“The staff at Hillmuth Automotive has always been honest and helpful. I had a difficult situation with an insurance claim and they went the extra mile to ensure I got the coverage I needed. They are always courteous and timely.”

-Jo Ellen Nauman, Olney



Howard County Auto Repair and Auto Service: Columbia (21044, 21045, 21046), Clarksville (21029), Cooksville (21723), Dayton (21036), Elkridge (21075), Ellicott City (21042, 21043), Fulton (20759), Glenelg (21737), Glenwood (21738), Guilford (20763), Hanover (21075, 21076), Highland (20777), Marriottsville (21104), Savage (20763), West Friendship (21784), Woodbine (21797).

Montgomery County Auto Repair and Auto Service: Ashton (20861), Bethesda (20814, 20815, 20817), Brookville (20833), Cabin John (20818), Chevy Chase (20815), Damascus (20872), Derwood (20855), Gaithersburg (20882, 20878, 20879), Germantown (20876), Kensington (20895), Olney (20832), Potomac (20854), Rockville (20850, 20851, 20853), Silver Spring (20904, 20905, 20906)