Car AC service in Chennai, we diagnose before we replace
GM Car A/C Service services and repairs car air conditioning systems at its workshop in Kallikuppam, Ambattur. Every visit starts with a free 30-point A/C and electrical checkup and a written report. You approve a written estimate before any work begins.
Founded by G.M. Manigandan, Managing Director and lead technician, working on car A/C with his own hands. Multi-brand cars and vans. Read our reviews on Google.
Reviewed by G.M. Manigandan, founder and lead technician · Last reviewed
Car AC services, quoted after the checkup
A/C specialists, not generalists. Every job starts with the checkup so you pay for the actual fault, not for parts you did not need.
Free 30-point checkup
A/C and electrical inspection with a written report, pressures, airflow, electrical checks and a plain-language explanation of what we found.
Free · no obligationGas filling (R134a / R1234yf)
Recovery, vacuum, leak-check and measured refill, single or double module, with pressures recorded before and after.
Quoted after the checkupLeak detection
UV dye, electronic sniffer and soap testing to find the real leak instead of refilling gas every month.
Quoted after checkupCompressor repair
Clutch, relay and wiring diagnosis; compressor replacement with written estimates for part and labour separately.
Written estimate firstCondenser, evaporator, cooling coil
Replacement and cleaning, including dashboard-level evaporator work done in-house.
Written estimate firstBlower, filter & airflow
Weak airflow, cabin filter, blower motor, vents and AC smell faults fixed at the source.
Quoted after checkupAuto-electrical
Battery, alternator, wiring, relays and sensor faults that masquerade as AC problems, checked in the same 30-point pass.
Included in checkup scopeDiagnostics-first repairs
Every repair recommendation comes from a measured finding you can see, gauge readings and test results, not guesswork.
That is our methodTechnician training
Learning the trade? GM Auto A/C Training runs a 27-day car AC technician course at this workshop.
Course detailsHow pricing works
30-point A/C + electrical checkup (written report)FreeA/C gas filling, single moduleQuoted after the checkupA/C gas filling, double moduleQuoted after the checkupA/C Gas + Airflow Refresh, gas fill, leak check, cabin filter inspection, airflow and vent temperature checkQuoted after the checkupRepairs are quoted individually after the checkup, always as a written estimate you approve first. No work starts without it.
Why customers choose us
Four rules the workshop runs on
We diagnose before we replace
No part gets swapped until a measured finding says it must. Gauge readings and test results come before the estimate.
Written estimate before work
You see the number on paper and approve it before a single spanner moves.
A/C specialists, not generalists
Car air conditioning is the core trade at this workshop, gas, leaks, compressors, electrical, EV thermal, every day.
Written estimates, approved first
The 30-point checkup is free. Every repair is quoted in writing after the checkup, and you approve the estimate before any paid work.
Pick-up and drop, on us
Free pick-up and drop anywhere in Chennai, on confirmed bookings, subject to slot availability. Say the word when you book on WhatsApp and we will lock a slot for your car.
Where our customers come from
Serving North Chennai, and all of Chennai with pick-up
Straight answers
Car AC service questions
Book your checkup
Free 30-point A/C and electrical checkup
Tell us the fault, we will WhatsApp you a slot. Written report on inspection, always. Mon–Sat, 10:00–20:00.
- or book directly -
Book on WhatsApp: 84280 00085Four steps, in this order, every time
Diagnosis-first is the whole method: measure, write it down, then price it. It is also why every job, gas filling included, is quoted in writing after the checkup.
We test before we quote
The free 30-point A/C and electrical checkup runs first, about 15 minutes, with a written report of what was measured.
You get the estimate in writing
The report says what was found. Gas filling, like everything else, is quoted in writing after the checkup, and nothing starts until you approve it.
No work starts until you approve
Nothing is opened up or replaced before you say yes to the estimate. If the diagnosis changes the scope, you hear about it first.
Repaired, then checked again
The approved work is done and the car is checked again before handover.
Frequently asked questions
How much does car AC gas filling cost in Chennai?
At GM Car A/C Service in Ambattur, gas filling covers single-module and double-module systems with R134a or R1234yf. The price is quoted in writing after the free 30-point checkup.
Why is my car AC not cooling?
Weak or no cooling usually comes from low refrigerant, a leak, a blocked condenser, a failing compressor clutch, or a blower and airflow fault. GM Car A/C Service identifies the actual cause with a free 30-point A/C and electrical checkup and a written report before quoting any repair.
Is the car AC checkup really free?
Yes, a free 30-point A/C and electrical checkup with a written report, no obligation. You approve the written estimate before any paid work begins.
Does GM Car A/C Service offer pick-up and drop in Chennai?
Free pick-up and drop anywhere in Chennai, on confirmed bookings, subject to slot availability. Ask on WhatsApp when booking.
Which areas does GM Car A/C Service cover?
The workshop is at Kallikuppam, Ambattur (near Avadi and Madhavaram). Customers regularly come from Ambattur, Avadi, Madhavaram, Surapet, Villivakkam, Padi, Kolathur, Perambur, Anna Nagar and Thirumullaivoyal, with free pick-up and drop anywhere in Chennai, on confirmed bookings, subject to slot availability.
What are GM Car A/C Service timings?
Monday to Saturday, 10:00 to 20:00. Closed Sunday. Phone and WhatsApp: +91 84280 00085.
Related pages and areas
Tell us what the car is doing
We will call you back to confirm a slot. Nothing is charged and nothing is booked until we have spoken.
Customer Service · Individual car owners. Mon–Sat 10:00 AM – 8:00 PM, Sunday closed. Prefer not to call? The form takes a minute.
Illustrative image. Not a photograph of GM premises, staff or a customer vehicle.