A century-old German automotive accessories manufacturer—widely recognized for its durability standards and strict engineering culture—was updating the HVAC (Heating, Ventilation, and Air Conditioning) system for its new vehicle platform.
The brand had traditionally used resistance-wire heating elements inside their cabin HVAC system.
However, as vehicle comfort and safety expectations increased, the company evaluated alternative heating technologies to meet modern performance requirements.
The customer faced several issues with their original resistance-based heater:
Inconsistent heating performance during rapid temperature changes
Risk of overheating if airflow was partially blocked
Slow heat-up rate in cold environments
High energy consumption
Shorter lifespan due to repeated thermal cycling
For a premium European brand known for reliability, these limitations became unacceptable.
They needed a heating element that was:
safer, more stable, energy-efficient, and maintenance-free.
The German engineering team actively searched for self-regulating heating solutions and learned about PTC (Positive Temperature Coefficient) heaters.
PTC immediately stood out because:
Self-regulating temperature curve ensures stable heating
No external thermostat required
Cannot overheat, even under airflow blockage
Faster heating response in cold climates
Longer lifespan due to material-based control
Based on industry referrals and online technical content, they contacted Tiancheng Thermistors, noting our:
32 years manufacturing experience
Established reputation in PTC materials
Strong R&D + customization for automotive applications
Certifications and reliability testing capabilities
Tiancheng supplied a custom PTC heating module engineered specifically for automotive interior HVAC units.
Key technical features:
Stable self-regulated temperature within ±5–10°C
Rapid warm-up when cabin air is cold
Automatic power reduction as temperature rises
Safe under zero-airflow or blockage conditions
Vibration-resistant assembly for automotive use
Available in multiple voltages compatible with 12V / 24V systems
High insulation & moisture-resistance for long-term reliability
The module was designed to seamlessly integrate into the customer’s HVAC housing without changing the system layout.
After testing and validation, the German manufacturer observed:
More stable cabin temperature control
Faster heating during cold starts
Zero overheating incidents during endurance tests
Significant reduction in energy consumption
Sharper response time for automatic climate-control systems
Longer component lifespan, reducing service requirements
Improved overall passenger comfort
PTC heating successfully replaced the original resistance heater with superior safety and performance.
30+ years specialization in PTC ceramic heating
Strong engineering capability and custom solutions
Consistent material performance with tight tolerances
Automotive-grade testing (aging, insulation, vibration, humidity)
Reliable lead time and stable quality
Ability to tailor power, voltage, temperature, and dimensions
This collaboration demonstrates how PTC technology significantly elevates the performance and safety of modern automotive HVAC systems.
By switching from a traditional resistance heater to a self-regulating PTC module, the German automotive brand achieved:
Safer heating
Smoother cabin temperature
Faster warm-up
Lower energy consumption
Higher reliability for long-term use
Tiancheng’s experience in custom automotive PTC modules enabled the brand to modernize their HVAC system without redesigning the entire assembly.
