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  • Mon 8:00AM - 5:00PM
    Tue 8:00AM - 5:00PM
  • Wed 8:00AM - 5:00PM
    Thu 8:00AM - 5:00PM
  • Fri 8:00AM - 5:00PM
    Sat Closed
  • Sun Closed
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636-441-8121 | 4600 Central School Rd, Saint Charles, 63304

Air Conditioning Repair For Cars and Trucks


Restoring Comfort with Kar Tech in Saint Charles

If your car's air conditioning system isn't keeping you cool in the scorching weather, there's no need to endure discomfort. Come over to Kar Tech in Saint Charles, where we'll swiftly restore your AC's performance. Reach out to us now at 636-441-8121 or drop by our shop at 4600 Central School Rd, Saint Charles, MO.


Five Indicators Your Car's AC Needs Attention

  • Your car's AC blows air only slightly cooler than the outside temperature.
  • Unpleasant mildew and mold odors emanate from your AC vents.
  • The AC functions only while the vehicle is in motion.
  • Even at the highest fan setting, there's weak airflow.
  • Water condenses or drips onto your foot while driving.

Don't delay! If your car's AC isn't operating at peak efficiency, a visit to Kar Tech is a wise move. Routine maintenance now can help you avoid more costly auto AC repairs later. Sometimes, resolving a malfunctioning air conditioner is as simple and cost-effective as replenishing the coolant.


Ensuring Optimal Performance for Your Vehicle's Cooling System

Most car and truck air conditioning systems eventually require attention due to wear and tear. Hoses supplying the AC unit can crack, clog, or develop leaks if neglected. Let us service your car or truck to keep your cooling system operating at its best. Dial 636-441-8121 to learn more about how we can restore your air conditioning.


Common Automotive AC Repair Services


Recharging Your Car's AC
When your car's air conditioning (AC) loses cooling power or fails to deliver cool air, a freon recharge may be in order. Recharging your freon is often a fast and cost-effective repair that can help you beat the summer heat. However, a freon leak could be due to a cracked hose or seal, indicating a more substantial repair may be necessary.

Repair Your Car's AC Compressor
The cool air in your car primarily comes from the compressor. Your vehicle's compressor performs four essential functions: pressurizing the refrigerant to cool cabin air, regulating temperature output, sensing temperature changes inside and outside the vehicle, and directing air to your car's AC condenser.

Repair Your Car's AC Condenser
Typically located in front of the radiator, your vehicle's A/C condenser plays a crucial role. When your AC compressor pressurizes the refrigerant, it flows to the condenser, reducing temperature and pressure. The condenser is vital for maintaining a comfortable cabin temperature by transferring cooled liquid refrigerant to the receiver/dryer or accumulator.

Repair Your Car's AC Evaporator
The evaporator, a crucial component tucked just behind the dashboard, plays a vital role in your car's air conditioning system. By efficiently cooling and dehumidifying the air before it circulates throughout the vehicle's cabin, the evaporator ensures a comfortable and refreshing interior climate, especially during warmer seasons.

Replace Your Car's AC Thermal Expansion Valve or Orifice Tube
The Thermal Expansion Valve or Orifice Tube monitors A/C system pressure and temperature, determining the precise refrigerant amount that can safely enter the evaporator. Imbalanced pressure can lead to unwanted moisture buildup in your car or truck's AC system.


Freon Recharging FAQs


How often should Freon be changed?
Never, at least not in the way you think of your oil being changed. Your car's AC system is a sealed unit. No new Freon needs to be added unless there's a refrigerant leak. Over time as your vehicle ages small cracks may form in your AC system parts such as the compressor, condenser, evaporator, receiver-dryer, expansion tube and connecting hoses allowing Freon to escape. If this occurs, you need to replace the failing part and have your Freon recharged.

How long should a Freon recharge last?
If your car's AC system was recently repaired and required a Freon recharge it should not need to be replaced again. Your AC system is a closed or sealed system that does not allow Freon to escape. Freon is not like gasoline; it does not get depleted. If Freon is escaping after your car's AC system has been repaired, then additional work may need to be done to find the leak.

How many cans of Freon does a car take?
Don't guesstimate your car's refrigerant needs! Most use 28-32 ounces (2-3 12oz cans), but larger vehicles and rear A/C can be different. Check your manual for the exact amount to avoid overfilling.

Can I leave my car running when adding Freon?
It is advised to have your engine running while recharging your car's A/C system. This is essential as the A/C compressor, powered by the engine, must be active to facilitate proper refrigerant circulation and ensure an effective recharge.

Why is my car blowing hot air after adding Freon?
A refrigerant leak can lead to a loss of pressure in the AC system, resulting in a failure to produce cold air. This is frequently the primary reason a recharge may prove ineffective. It is crucial to inspect the system for leaks and address any issues before proceeding with a recharge.

Schedule your auto AC repair appointment with Kar Tech today! Our expert technicians are equipped to swiftly diagnose and resolve all your air conditioning issues.

To learn more about our AC repair services, call us at 636-441-8121 or request a quote by clicking below:


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What Our Customers Are Saying

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Always good work and fair prices. I have a Tahoe that I purchased new that now has 340,000 miles, and a bunch of Jeeps with 240,000 miles apiece, I credit Kar Tech for giving me the ability to keep my autos on the road so long.

, 05/19/2020

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Knowledgeable, Efficient, and Honest! Kar Tech diagnosed the problem, called me with an estimate, and completed the repair - at a very reasonable price!! I highly recommend this place!

, 05/19/2020

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Great people who have gone above and beyond to get my truck on the road. Honest and very fair. I couldn't ask for anything to have gone better.

, 05/19/2020

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I have used Kar Tech for the last 10 years with 3 different vehicles. I feel so safe and comfortable taking my car to them. I get honest feedback. The prices are great and the service is awesome. They always get me in quick and are great at explaining everything to me. I appreciate having them as my go-to more than they know. Thank you!

, 05/19/2020

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Nice family owned business who knows what their doing!

, 05/19/2020

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Friendly service and great prices. This has been my only mechanic for 15 years at least and will only go to them!

, 05/19/2020
  • ASE Master Technician
  • NAPA AutoCare Center
  • IDENTIFIX
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  • MITCHELL 1
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  • Call Us For Service: 636-441-8121