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AC Air Conditioning Auto Parts


Midwest Engine Service, Inc Reviews

Midwest Engine Service: Your Truck or Car's AC System

At Midwest Engine Service we understand how your AC system works. Your car or truck's AC system uses a Freon gas type refrigerant for cooling. For automotive applications, Freon is refined into tetrafluoroethane, a non-toxic, non-flammable and non-corrosive gas called R134a. The ability of the refrigerant gas to change its physical properties into a liquid as it is compressed and condensed keeps you cool on hot summer days.

Discover More Reliable AC Parts

If your AC system starts blowing warm air come by the store at 3712 Milwaukee St and talk with one of our auto parts specialists to determine what parts you need to get your AC working again.

Your AC compressor is the auto part responsible for compressing the refrigerant R134a. When it is compressed it becomes very hot. Because hot is the opposite of what drivers want in an AC system, the refrigerant must be cooled.

R134a is cooled by your car AC condenser. This auto part is a series of coils that look very similar to a radiator. Just like a radiator, outside air passes over the condenser to remove the heat from the compressed gas. It is then condensed into a very wet cold liquid. The receiver-drier absorbs excess moisture from the liquid. Next, your AC filter traps debris within the liquid that can cause clogging in your car's AC system. Call 608-244-9040 today and let our auto parts specialists help you find the right compressor, condenser or receiver drier to fit your car or truck.

At this point, the refrigerant liquid is still under too much pressure. The expansion valve and orifice tube take over and force the refrigerant to change from a high-pressure liquid refrigerant into a low-pressure liquid refrigerant mist before it enters the evaporator.

As the low-pressure liquid refrigerant mist flows through the evaporator, a blower motor pushes air across the cold tubes of the evaporator and cooled dry air flows into the passenger compartment of the automobile. The accumulator is a holding tank for the refrigerant as it exits the evaporator. While the refrigerant is circulating inside, the accumulator removes any moisture that may be present.

Call 608-244-9040 today and let our auto parts specialists help you find the right expansion value, orifice tube, and evaporator to fit your car or truck.

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Testimonials

reviewiconMadison, WI
They bored, line-honed, and hot tanked my turbocharged miata's cast iron engine block. They balanced the rotating components, polished the crank, and measured the clearances with new forged internals - Jose is an excellent mechanic. They had about 50 other engine projects in queue and got mine turned around quickly. My engine has ran strong now at wide open throttle for a few thousand miles. I cannot recommend this shop enough, great work at a good price - it is worth the drive from Milwaukee/Chicago
~ , 03/13/2026
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reviewiconMadison, WI
WOW! I can say that this is the best customer service I have ever had! I am a female who knows NOTHING about cars. I was on a cross country roadtrip when I started haveing engine trouble. I got to Madison, WI and needed the car fixed. I was terrified of being taken advantage of. All this was foreign to me as I did not have a car for most of my life. I called around to MANY transmission shops. When I found Midwest Engine Service I knew I was in the right place. From the get go, I was reassured by the kind voice on the phone. I spoke with the owner, Wayne. He went over the issue with my transmission top to bottom. He spoke in laymen's terms, so I actually understood what he was saying. Not only did I feel comfortable trusting Midwest Engine, they gave me the best quote and fastest turn around! Wayne kept me informed step by step, as I was still trying to finish my roadtrip. It seemed I needed a new axle, so I added that to the work order. Again, Waynes' thoughtful words and actions helped keep me at ease. When I got the call that the car was done, the price was even lower than the quote. This included the axle as well! I was so happy with the quality of work, the service and the trusting comfort they gave me. I was able to get back on the road the next morning. Finally, I was leaving Madison. As I was driving out of town that following morning, I got a call from Wayne. I instantly thought he was going to say they needed the car back or something. Why else would they be calling? It was Wayne. He called to make sure the car was running smoothly and that I had made it out of town ok. He then told me he also called to wish me a safe rest of my trip. I felt blessed. I had definitely found the greatest mechanic and team. They are just lovely, honest and have human integrity. Thank you Wayne & the team
~ , 03/13/2026
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