Air Conditioning Not Cold - Troubleshooting - Hudson Automotive Group, Inc.

Key Facts

Low refrigerant (leak) is the most common cause
AC systems do not need regular "recharge" - if it's low, there's a leak
Leaks must be found and repaired before refilling refrigerant
Compressor failure is expensive - maintain your AC to prevent it
Running AC monthly (even in winter) prevents seal damage
Clogged cabin filter can reduce airflow (easy fix)
Modern refrigerant (R1234yf) is expensive to replace

Common AC Problems

Not Cold at All

Complete loss of cooling usually means no refrigerant (large leak) or failed compressor. Check if AC compressor clutch engages (clicking sound and rpm change when you turn AC on).

If compressor doesn't engage, could be electrical problem, failed compressor, or system protecting itself due to no refrigerant. Needs professional diagnosis.

Cold Then Warm

Gets cold initially then warms up indicates low refrigerant level, or icing on evaporator coil. System cycles on/off due to low pressure.

Requires leak detection, repair, and refill. See our AC service.

Weak Airflow

Often caused by clogged cabin air filter (easy fix). Could also be failed blower motor or duct obstruction.

Check/replace cabin filter first (you can do this yourself on many vehicles). If airflow still weak, needs further diagnosis.

Understanding Refrigerant

AC systems are sealed - refrigerant does not "wear out" or need regular replacement. If your AC needs recharge, you have a leak that must be found and fixed.

Just adding refrigerant without fixing the leak wastes money and refrigerant. The leak will empty the system again, often within weeks or months. Proper service includes leak detection, repair, evacuation, and refill.

Prevention

Run AC for 10-15 minutes monthly, even in winter
Replace cabin air filter annually
Use AC with defrost in humid weather
Address small leaks before compressor damage occurs
Listen for unusual noises when AC runs

Frequently Asked Questions

1. How much does AC repair cost?

Recharge only: TODO. Leak repair and recharge: TODO. Compressor replacement: TODO. Cost varies widely. Simple recharge is inexpensive, compressor replacement is expensive. Diagnosis identifies what's needed. See AC service.

2. Can I recharge it myself?

DIY recharge cans only add refrigerant - they don't fix leaks. If you have a leak, DIY recharge is temporary and wastes refrigerant. Professional service finds and fixes leaks, then properly evacuates and refills system.

3. Why should I run AC in winter?

AC compressor has seals that need lubrication. Running monthly keeps seals flexible and prevents compressor damage. Most vehicles run AC automatically with defrost.

4. Is leak detection included in AC service?

Yes, leak detection is part of proper AC repair. We use UV dye or electronic detection to locate leaks before refilling refrigerant. See our service pricing.

5. What is R1234yf vs R134a?

Two types of AC refrigerant. Newer vehicles (roughly 2015+) use R1234yf, which is more expensive but environmentally friendly. Older vehicles use R134a. Using wrong type damages system - we verify correct type for your vehicle.

6. Can I just live without AC?

In Finland, maybe - but AC is important for windshield defogging/defrosting. Modern vehicles run AC with defrost to remove humidity. Living without AC may mean foggy windows.

7. Why does my AC smell bad?

Mold/bacteria growing on evaporator from moisture. Usually harmless but unpleasant. AC cleaning and deodorizing service eliminates smell. Replacing cabin filter also helps.

8. How long does AC repair take?

Simple recharge: 1-2 hours. Leak repair: 2-4 hours depending on location. Compressor replacement: 5-8 hours. We provide accurate time estimates with diagnosis and scheduling.

9. Will AC problems cause other damage?

Failed AC compressor can seize and damage serpentine belt. Low refrigerant can damage compressor. Addressing AC problems early prevents additional expensive failures.

10. Can AC be repaired in winter?

Yes, we can diagnose and repair AC year-round. Winter is actually a good time for AC service as there's no summer rush and you're ready when warm weather returns.

Related Pages

Last updated: 9 January 2026

Air Conditioning Not Cold - Troubleshooting