Thermatic Fan Frequently Asked Questions Answered

17/12/2018 09:00AM

Davies Craig Thermatic Fans have become a popular replacement for the antiquated concept of a mechanical belt-driven fan which have been fitted to cars throughout history. We are asked a number of questions on a regular basis about our Thermatic Fans, in this blog we will answer some of these!

If space permits, should I mount single or dual Thermatic Fans?

Like anything, it’s personal choice however Davies, Craig recommend one larger fan, especially for larger capacities engine wise. There will be times, says Davies, Craig, that two will also be fine, however, as an example, a single 16 inch diameter fan will move more air than two 12 inch diameter fans.

What size Thermatic Fan is right for my application?

Size does matter, in fan size and radiator size. It’s pretty easy to work out which size you need. Once you’ve measured the radiator’s height, width, and depth, our website will be able to match the size for the right fan. As a general rule, we recommend the largest fan possible that will fill the dimensions measured above. With a range starting off at 8 inches, with different depths and voltages, there will be an application to suit any engine and radiator size.

Why are the blades on Davies Craig Thermatic Fan straight rather than curved?

Davies Craig invests a lot of time into Research & Development, and testing products has shown that straight fan blades are more effective in moving air than curved blades. It was found that curved blades were overall quieter in performance, but that lack of noise was due to the lack of air being moved by the blades. Also, by using a ring around the blades, Davies, Craig found that straight blades and even wing-tips on the blades kept the air inside the circle, again maximizing efficiency.

Should I mount my Thermatic Fan upstream or downstream of my radiator?

Davies, Craig finds that people are unsure about where to put the fan, ahead of the radiator or behind it. Or, push instead of pull? An important consideration here is where, if you choose to use a push and pull pair, the fans go. Fans should not be fitted on opposite sides of radiator core unless these are offset such that the airflow of one is not interfering with the airflow of the other.

As we head into another hot Australian summer, we also receive several calls relating to the overheating of engines. We have developed a simple checklist that you can run through to help identify the cause of these issues through a process of elimination.

  1. Is your fan blade facing wrong direction?
    2. Is your fan blade rotating in the wrong direction?
    3. Is your fan wired to the coil or alternator (not enough voltage)?
    4. No air conditioning condenser fan?
    5. Is your temperature gauge faulty? Does it disagree with thermometer in radiator?
    6. Are you towing a heavy caravan, or similar?
    7. Do you have an inadequate fan kit fitted?
    8. Is the Oil Cooler obstructing the flow of ram air?
    9. Is an insect screen obstructing the flow of ram air?
    10. Are your driving lights obstructing the flow of ram air?
    11. Is your front number plate obstructing the flow of ram air?
    12. Is your Battery/alternator not delivering up to 13+ Volts?
    13. Is there enough water/coolant in the radiator?
    14. Is your radiator dirty? Does it need cleaning or flushing out?
    15. Is your radiator cap faulty, thus allowing water to boil at 100°C?
    16. Is the thermostat faulty?
    17. I the electric Fan motor faulty?
    18. Is your electric fan mounted correctly, in the ‘hot corner’ of the radiator?
    19. Is the engine out of tune, or idling too fast?

So there you have it, the answers to some of our most frequently asked questions as well as a checklist to run through when your car overheats? Do you have a question about our Thermatic Fans, or perhaps their suitability for your application? Use the contact form here to get in touch!