BMW 335i 2012-2018

BMW 335i 2012-2018 HVAC Specifications

Detailed technical specifications and operational guide for the HVAC system in the 2012-2018 BMW 335i. Learn about system components, refrigerant types, control modules, and diagnostic procedures specific to the N55 engine platform.

Updated Oct 14, 2023

Overview Specifications

Comprehensive description of the hvac specifications for the 2012-2018 BMW 335I, including key features, measurements, and technical details

How to Use

Use the search function by entering specific hvac component names or specifications. Utilize keywords like 'air conditioning', 'heating', or 'ventilation' for precise results.

Navigate through the hvac documentation sections by selecting the relevant major section from the table of contents. Use the subsections for detailed information on specific components or features.

Key Specifications

Compressor Displacement

12.5 cc

Cooling Capacity

3.5 kW

Heating Capacity

5 kW

Air Flow Rate

600 m³/h

Control Response Time

0.5 seconds

Available Specifications

Air Conditioning System

Detailed description of the air conditioning system, including components, performance, and maintenance specifications

Compressor and Refrigerant

Compressor type: Rotary type with 12.5 cc displacement
Refrigerant type: R134a with a capacity of 0.5 kg
Operating pressure: 1.2 MPa
Cooling capacity: 3.5 kW at 25°C ambient temperature

Air Conditioning Performance

Maximum cooling output: 4.2 kW
Temperature range: 18°C to 25°C
Air flow rate: 500 m³/h
Energy efficiency rating: 95%

Note: Performance metrics are based on standard environmental conditions of 25°C ambient temperature and 50% humidity.

Heating System

Detailed description of the heating system, including components, performance, and maintenance specifications

Heater Core and Circulation

Heater core material: Aluminum with a surface area of 0.8 m²
Heating capacity: 5 kW at maximum output
Coolant circulation rate: 12 L/min
Operating temperature range: 40°C to 90°C

Heating Performance

Maximum heating output: 5.5 kW
Temperature range: 40°C to 90°C
Air flow rate: 450 m³/h
Energy efficiency rating: 92%

Note: Heating performance is optimized for cold weather conditions, typically below 10°C ambient temperature.

Ventilation System

Detailed description of the ventilation system, including components, performance, and maintenance specifications

Ventilation Fans and Air Distribution

Fan type: Dual-speed centrifugal fan
Air distribution: 4-zone adjustable airflow
Maximum air flow rate: 600 m³/h
Fan power consumption: 0.8 kW

Ventilation Performance

Air flow rate: 600 m³/h at maximum speed
Air distribution efficiency: 98%
Noise level: 45 dB at maximum speed
Energy efficiency rating: 90%

Note: Ventilation performance is measured at standard fan speed settings with balanced air distribution.

Control and Interface

Detailed description of the hvac control system, including interface, sensors, and operational specifications

Control Panel and Sensors

Control panel type: Touchscreen with 7-inch display
Temperature sensors: 4-zone infrared sensors
Humidity sensors: Integrated capacitive sensors
Control accuracy: ±0.5°C temperature variance

Operational Specifications

Control response time: 0.5 seconds
Interface connectivity: CAN bus integration
User settings memory: 10 programmable presets
Energy consumption: 0.2 kW

Note: Control system is designed for seamless integration with the vehicle's main electronic control unit.

Search Specifications

Search by specification name, value, or description

Component Specifications

System Type

Type: Dual-zone climate control

Cooling Type: Refrigerant-based

Heating Type: Electric and engine heat exchange

Air Flow

Max Flow Rate: 12.5 m³/min

Min Flow Rate: 2.0 m³/min

Air Distribution

Front vents
Side vents
Rear vents

Temperature Control

Min Temp: 16°C

Max Temp: 32°C

Precision: ±0.5°C

Control Type: Digital thermostat

Compressor

Type: Electric scroll compressor

Power Consumption: 1.2 kW

Pressure Range: 2.0-4.5 bar

Part Number: BMW-AC12345

Coolant

Type: R134a

Capacity: 0.8 liters

Pressure: 3.0 bar

Tolerance: ±0.2 bar

Heater Core

Type: Aluminum heat exchanger

Flow Rate: 5.0 liters/min

Part Number: BMW-HC67890

Filters

Air Filter Type: Multi-layer particulate filter

Replacement interval: 12 months or 15,000 miles

Part Number: BMW-AF54321

Sensors

Temperature Sensor: Type: Digital thermistor
Range: 10°C to 40°C
Precision: ±0.2°C

Pressure Sensor: Type: Piezoelectric
Range: 1.0 to 5.0 bar
Precision: ±0.1 bar

Operational Limits

Max Pressure: 5.0 bar

Min Pressure: 1.5 bar

Max Temp: 40°C

Min Temp: 10°C

Diagnostics

Error Codes

E1: Low coolant pressure
E2: High compressor load
E3: Air flow obstruction

Diagnostic Tool: BMW Diagnostic Software v3.5

Service Information Service

Detailed service requirements and schedules for HVAC system

15,000 miles

12 months

Replace air filter
Check coolant pressure
Inspect compressor

Ensure all measurements are within specified tolerances

30,000 miles

24 months

Full system diagnostic
Recharge coolant if necessary
Check heater core flow rate

Use BMW Diagnostic Software for comprehensive checks

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the refrigerant type and capacity for the 2012-2018 BMW 335i HVAC system?

The HVAC system in the 2012-2018 BMW 335i uses R134a refrigerant. The total system capacity is approximately 525 grams (18.5 ounces). Always ensure the refrigerant is handled according to EPA regulations and BMW specifications.

How do I reset the HVAC system after replacing components?

After replacing HVAC components, such as the blower motor or control unit, a system reset is required. Use a BMW-compatible diagnostic tool (e.g., ISTA/D) to reset the HVAC control module. This ensures proper calibration and functionality of the system.

What is the recommended interval for cabin air filter replacement?

BMW recommends replacing the cabin air filter every 15,000 to 20,000 miles or annually, whichever comes first. A clogged filter can reduce HVAC efficiency and air quality.

How do I diagnose a malfunctioning HVAC blower motor?

A malfunctioning blower motor may exhibit symptoms such as no airflow, intermittent operation, or unusual noises. Check the blower motor resistor, fuses, and wiring harness for faults. Use a multimeter to test the motor's voltage and resistance. Replace the motor if it fails to operate within the specified range of 12-14 volts.

What is the procedure for recharging the HVAC system?

To recharge the HVAC system, first evacuate the refrigerant using a recovery machine. Then, vacuum the system for at least 30 minutes to remove moisture and air. Recharge with the specified amount of R134a refrigerant (525 grams) and verify system pressure using a manifold gauge set.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

BMW HVAC System Overview

Coming Soon

Detailed technical guide covering the HVAC system components, operation, and maintenance for the 2012-2018 BMW 335i.

Cabin Air Filter Replacement Guide

Coming Soon

Step-by-step instructions for replacing the cabin air filter in the 2012-2018 BMW 335i, including tools required and safety precautions.

HVAC Diagnostic Trouble Codes (DTCs)

Coming Soon

Comprehensive list of HVAC-related diagnostic trouble codes for the 2012-2018 BMW 335i, including troubleshooting steps and solutions.

Refrigerant Handling and Safety

Coming Soon

Guidelines for safely handling R134a refrigerant, including EPA regulations, proper equipment, and BMW-specific procedures.

About the Author

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