ECU Fan Activation Temperature Change Online Service

 Remote service to modify, adjust, set, or change cooling fan activation, and on/off temperature

Is your cooling fan kicking in too late?

Does the fan only activate at high temps when you’d prefer it to turn on sooner?

With our ECU fan activation temperature tuning, we adjust the exact point where your fan turns ON and OFF, 

giving you better control, lower coolant temps, and peace of mind in hot weather or traffic.

Keep reading to see how our service works and how we can help.

1. Why Adjust Your Fan On/Off Temps? 
2. What do We Do?
3. Benefits of Fan Control Tuning?
4. Who Needs This Service?
5. How to Get Started (For Automotive Technicians)?
6. How long does it take?
7. How much does it cost?
8. Guarantee and technical support
9. FAQ – Fan Control Tuning

1. Why Adjust Your Fan On/Off Temps

From the factory, most ECUs are calibrated with very high thresholds. That means your fan may not activate

until coolant temps reach 95–105°C (203–221°F), which is often too late for tuned cars, heavy-duty use, or hot

climates.

Common issues drivers complain about:

• “Fan kicks in too late”, overheating risk in traffic.
• “ECU not turning on fan early enough”,  uncomfortable temps during idle.
• “Fan comes on at 105°C, I want it at 90°C”, safer, cooler operating range.
• “Fan OFF hysteresis too small”, annoying on/off cycling.

We fix all these issues by recalibrating your ECU.
 

2. What do we do?

1. Lower fan turn-on temperature – Example: change from 105°C to 90°C.
2. Set fan OFF hysteresis – prevent constant cycling (e.g., fan off at 85°C).
3. Custom ECU fan control tuning – tailored for your thermostat, radiator, or climate.
4. PWM fan control – advanced setups where fan speed is linked to ECT (Engine Coolant Temp) for smoother operation.

We adjust ECU tables such as:

• Fan On/Off Temperature ECU settings
• PWM Desired ECT table
• Fan OFF hysteresis logic
• ECU fan control parameters
   

3. What are the Benefits of FAN Control Temperature Tuning?

• Cooler running temps, especially useful for tuned or performance cars.
• Longer engine life, prevents heat soak and overheating, protects engine and Turbo Life
• Prevents overheating in traffic, stable temps in traffic, fan comes on sooner, keeps idle temps under control.
• Custom setup, perfect match for 180°F thermostat upgrades.
• Improves Performance & Reliability

4. Who Needs FAN Temperature Remap Service?

• Tuners who have just installed a lower temperature thermostat.
• Drivers in hot climates, where the fan kicks in too late.
• Off-road, towing, or track cars need better cooling control.
• Anyone wanting to change the ECU fan activation temperature safely and professionally.
   

5. How to get Started?

• Buy credits
• Select your ECU or tell us about it by email or on WhatsApp
• Upload your ECU file 
• Tell us your target fan ON/OFF temps, for example, fan ON at 92°C, fan OFF at 86°C.

Upload your ECU file now and let us customize your cooling system for maximum reliability.

6. How Long Does It Take?

File Processing for Tuners:

If a manual solution is required for your selected ECU, our expert team will modify your file after payment and

submission. The modified ECU file will be delivered via email or your preferred platform (e.g., WhatsApp) within

minutes during working hours. (Less than an hour)

ECU Remote Programming for Mechanics

Reading, modification (remap), and reprogramming usually take 1 hour.

7. Pricing Information: How Much Does the ECU FAN Temperature Tuning Cost?

For Tuners: 

You can view approximate service prices on our Pricing page. For the exact cost, simply select your vehicle, ECU

part number, the desired service, and the system will then display the final price.

The total price may vary based on several factors. New users receive a discount code, and the largest savings

are reserved for VIP members.

Our VIP Plan includes:

• Priority file processing
• Exclusive discounts on future orders
• Access to special offers and promotions

Interested in becoming a VIP? Visit the pricing and plans page or contact us to learn more and unlock these

benefits.

For Mechanics or Owners:

To get the exact price, please contact us. 

8. FAQ

Q: How can I make my fan turn on sooner?
 

A: By lowering the ECU fan activation temperature – for example, instead of waiting until 105°C, we can make it

kick in at 90–95°C.

Q: Can you adjust the fan OFF hysteresis?
 

A: Yes. This prevents the fan from turning on and off constantly (chopping). We set a stable ON/OFF range.

Q: What if my fan is PWM controlled?
 

A: We use the PWM Desired ECT table to control fan speed dynamically, so the fan ramps up smoothly as temps rise.
 

9. Guarantee and Technical Support

At ARMHEX Center, we are committed to delivering exceptional online services to tuners, owners, DIY, and

automotive repair technicians and providing the fastest, highest-quality technical support. 

If you encounter any issues with your modified file or repaired ECU, we are dedicated to resolving them swiftly

and effectively. Our support team can always address your concerns and offer assistance whenever needed.

We also offer a 100% Money-Back Guarantee if you are not satisfied with our service, or the service, tuned, and

the changed ECU file does not meet the specified requirements, and our technical team cannot resolve the

issue.

If the car or ECU model is not listed, or you have questions or concerns, please contact us via email or

WhatsApp.

WhatsApp:

+1 (747) 229 6694

+1 (657) 229 1838

Email: contact.armhex@gmail.com

Interested in more tuning services?

Check out ARMHEX Automotive software services here.

Stop worrying about your fan kicking in too late. Whether you need lower fan on/off temps, ECU fan control tuning, or PWM fan setup, we’ve got you covered.