Batteries, starters & alternators
Need a jump-start, or having repeated starting trouble? We evaluate the battery, relevant circuits and connections before recommending vehicle-specific repairs.
Starting and charging serviceWE COME TO YOUR HOME, WORKPLACE, OR SAFE LOCAL LOCATION
Mobile Mechanic Serving Johns Creek, Alpharetta & North Fulton.A/C Specialists. On-Site Auto Repair.
4A Auto is a mobile mechanic and automotive A/C repair service serving Johns Creek, Alpharetta, and North Fulton. We bring on-site diagnosis and qualifying repairs to homes, workplaces, and safe local locations, including A/C repair, batteries and starting service, brakes, electrical repair, heating and defroster, mechanical repair, and used-car inspections.
Serving Johns Creek, Alpharetta, Roswell, Duluth, and qualifying nearby addresses. Share your ZIP; we confirm the route and repair fit before a visit. Check your service area.
Get My A/C Appointment Price Explore mobile repair servicesPrefer text? Tell us about your vehicleText anytime. Calls answered Mon-Sat, 7:30 AM-7:00 PM. Sunday messages are answered the following business day.
For A/C concerns, share your vehicle, ZIP, and symptoms. We confirm your initial diagnostic appointment price before scheduling, then explain any further testing or repair options before work continues. See how pricing works.
On-site diagnosis · Transparent findings · Repair only with your approval
4A AUTO A/C & REPAIRYour vehicle.
Your vehicle.
Our specialty.
Automotive A/C expertise, diagnosis, and general repair at your location.
START WITH YOUR CONCERN
Popular reasons people contact us
A/C SpecialistIndependent second-opinion evaluations
Father & SonChris and Alex work directly with you
Clear findingsEvaluation and estimate before repair approval
We come to youHome, workplace, or a safe local location
2 yr / 24k miQualifying repairs with 4A-supplied parts and labor
3 yr / 36k miQualifying complete A/C systems installed by 4A
Coverage depends on the approved repair and is documented on the estimate or invoice. Terms and exclusions apply. Review warranty details.
SERVICES AT YOUR LOCATION
What does your vehicle need?
Brake concerns
Noise, grinding, vibration or a repair recommendation to review? We evaluate the concern and perform qualifying brake repairs at suitable locations.
On-site brake serviceElectrical diagnosis & warning lights
Warning light, electrical feature not working, or an intermittent concern? We diagnose accessible electrical problems and explain the next step.
Electrical diagnosisBuying a used vehicle?
Get independent mechanical findings before money changes hands. We inspect qualifying vehicles at seller, dealer, home, workplace, or approved meeting locations.
Explore used-car inspectionsNeed something else that can be completed safely on-site? Explore qualifying mobile mechanic services.
TESTING, APPROVAL AND CARE
How your visit works
See the service process
Prepare & evaluate
We confirm your concern, set up the work area and test the vehicle.
Explain & estimate
You receive documented findings and a repair estimate to review.
Approve & repair
We complete only the work you approve, using parts selected and supplied by 4A.
Verify & clean up
We check the repair result and clean the work area. Qualifying repairs include a 2-year / 24,000-mile parts-and-labor warranty, whichever comes first; your estimate or invoice explains the terms.
We use vehicle protection, coverings and fluid containment as the work requires. Review property and outlet requirements.
INDEPENDENT · FATHER & SON OWNED
Meet Chris & Alex.
4A is an independent father-and-son business serving North Fulton and South Forsyth since April 2021. When you contact 4A, you work directly with Chris and Alex, so you can discuss your vehicle, review the findings, and understand the next step before authorizing a repair.
Direct communication. Clear findings. Careful work.
158Nextdoor Faves
2022 · 2023 · 2024 · 2025
Counts checked September 27, 2026. Totals may change.
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CUSTOMER REVIEWS
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NEIGHBOR RECOMMENDATIONS
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VERIFIED SERVICE REVIEWS
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BUSINESS PROFILE
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AUTOMOTIVE A/C IS WHAT WE DO EVERY DAY
Choose an A/C specialist who tests before recommending parts.
Vehicle A/C diagnosis and repair is our day-to-day work, not an occasional add-on. We bring focused testing, refrigerant-handling equipment, and clear explanations to suitable customer locations.
A/C-focused work, every day
We work on automotive A/C concerns daily, from weak or intermittent cooling to electrical controls, leaks, compressor concerns, and system contamination.
Diagnosis before parts or refrigerant
We test the vehicle and explain what the evidence supports. A pressure reading, a recharge, or another shop's recommendation alone does not decide the repair.
Professional equipment and resources
We use professional A/C diagnostic, recovery, and charging equipment, supported by ongoing training and technical resources for today's vehicle systems and refrigerants.
Transparent findings and straight answers
When useful, we document readings, findings, photos, or video so you can see what we saw. We answer your questions in plain language before you decide about a repair.
Training, membership and certification
Annual A/C training
We take annual automotive A/C training to keep our knowledge current as vehicle systems, refrigerants and service procedures change.
MACS membership
We belong to the Mobile Air Climate Systems Association, which provides automotive A/C training and technical resources.
About MACSWhat Section 609 means
Our refrigerant service is performed by a Section 609-certified technician. This certification covers proper automotive refrigerant handling, recovery and use of service equipment through an EPA-approved training program.
About Section 609 certificationOur qualifications support the work; the reason to choose 4A is the quality of the testing, transparent documentation, and the honest answers you receive. Need an independent A/C second opinion? We review the vehicle ourselves and explain what the evidence supports.
FEATURED BY WOLFPEN, ROSWELL
When a Roswell Porsche shop needed A/C expertise, it called 4A.
Wolfpen asked 4A Auto A/C & Repair to handle contaminated refrigerant during a Porsche 911 repair.
Watch the 1:21 segment to see the work in context.
Visit Wolfpen's YouTube channelDON'T APPROVE A MAJOR A/C REPAIR YET
Get the facts before you approve.
If you were told your vehicle needs a compressor or another major A/C repair, an independent evaluation can give you documented findings before you approve the work.
We explain what the testing supports, what remains uncertain, and whether the recommendation makes sense for your vehicle.
Get an independent A/C evaluation