Auto Electrical Precision Diagnostics

Auto Electrical Service Chennai — Precision Diagnostics, Reliable Results

Electrical faults are the hidden reason many car AC problems go unsolved. GM Car A/C Service diagnoses AC circuit faults, battery issues, alternator problems, and wiring faults — precisely, every time.

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AC Circuit Diagnosis Battery & Alternator Testing Wiring Fault Tracing All Car Brands

Get Your Electrical Fault Diagnosed

Electrical faults need precise diagnosis, not guesswork. Call us — we find the exact fault, not just swap parts randomly.

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Mon–Sat 10AM–8PM

Why is my car AC not working even after gas was refilled?

If your car AC was recharged with refrigerant but still doesn't cool, the fault is almost certainly electrical. Many workshops only check and fill gas — they don't diagnose electrical faults. This is why some customers come to us after spending money elsewhere with no result.

Common AC electrical faults we find and fix:

  • Failed AC compressor relay — prevents compressor from receiving power
  • Blown AC fuse — easy to replace when the right fuse is identified
  • Faulty AC pressure switch — incorrectly signals low pressure, blocking compressor
  • Failed blower motor or resistor — no airflow despite AC being on
  • Wiring harness damage — rodent damage, heat damage, chafed insulation
  • AC control module fault — signals not sent or received correctly

Call +91 8428000085 — we diagnose the exact electrical fault before recommending any repair.

Auto Electrical Services We Offer

AC Electrical Circuit Diagnosis

Full diagnosis of the AC electrical system — compressor relay, pressure switches, blower motor circuit, AC control module, wiring continuity testing.

Battery & Alternator Testing

Battery load testing, cold cranking amp verification, alternator output voltage and current testing. Chennai's heat degrades batteries fast — we check before they fail.

Wiring & Fuse Diagnosis

Systematic tracing of wiring faults — shorts, open circuits, rodent damage, corroded connectors, blown fuses and their root causes. We find the fault, not just replace the fuse.

Electrical Symptoms We Diagnose

The compressor clutch not engaging is often electrical — failed relay, blown fuse, faulty pressure switch, or low voltage. Our technicians test each component in sequence to identify the exact failure point before any parts are replaced.

A fan that works on high but not low speeds usually indicates a failed blower resistor (common in Chennai's heat). A completely dead blower points to a failed motor, fuse, or relay. We test and replace only the faulty component.

Parasitic battery drain — where something stays on after the car is switched off — requires systematic current draw testing on each circuit. We use a clamp meter to identify the circuit drawing abnormal current, then trace it to the specific component.

Intermittent AC faults are the hardest to diagnose — they disappear when you bring the car in. Our technicians know the common intermittent failure patterns: heat-sensitive relays, corroded connectors that make contact only sometimes, and pressure switch faults that cut out under load.

The GM Diagnostic Difference

We don't guess and replace parts hoping to fix the fault. Every diagnosis starts with systematic testing using proper tools — multimeters, circuit testers, and manufacturer wiring diagrams. You only pay for what actually needs replacing.

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Frequently Asked Questions — Auto Electrical Service

If gas was refilled but AC still doesn't work, the fault is electrical — failed relay, blown fuse, pressure switch fault, or blower motor problem. GM Car A/C Service diagnoses AC electrical circuits systematically to find the exact failed component.

Yes. Voltage drop from a weak battery affects compressor engagement, blower motor speed, and control module function. Battery health testing is part of our AC diagnostic process whenever electrical symptoms are present.

Focused auto electrical diagnosis typically takes 30–90 minutes. Simple relay or fuse repairs are completed same day. Complex wiring fault tracing may take longer. We provide a clear timeline and estimate before work begins.

Cost depends on the fault type and components involved. Simple fuse or relay replacement is very affordable; wiring repairs or module replacements vary. GM Car A/C Service provides transparent quotes before any work. Call +91 8428000085 for your estimate.

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Diagnose Your Car's Electrical Fault Today

Stop guessing and swapping parts. At GM Car A/C Service, we use systematic diagnostic methods to find the exact fault — then repair only what's needed.
Precise. Honest. Reliable. Since 2019.

Call +91 8428000085 — Book Diagnosis WhatsApp for Quick Reply Book Appointment

No:16 Gangai Amman Kovil Street, Kallikuppam, Ambattur, Chennai 600053 · Mon–Sat 10AM–8PM

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