Radiator and AirFlow issues caused by Large Spotlights?

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Originally Posted by gruntfuttock

I have the 240 blitz on mine and it runs between 89 and 92 degrees winter / summer 43 degree days or 10 degrees.
Have a nanocom for temperature checking

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Are you towing when these temps are recorded?

No I was not.

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Originally Posted by filcar

I've got a pair of Fyrlyts about the same size in the same position along with a winch control box, negligible effect on temps according to my ultra gauge

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Ditto!

I have redarc oil, coolant and engine block temperature gauges. After fitting two 6” and one 9” lights there was absolutely no difference.

I had two Super Oscars (75w HID) and a winch in front of my radiator. Using Ultragauge and TMS, temps always seem to be mid to high 90's. Removed the Lights and now low to mid 90's. Not sure how much difference it really makes, but i feel more comfortable about it. Have gone for a light bar tucked up high under the bar.
So if you have the ability to monitor temperatures closely it probably does not make a lot of difference either way.

In my D2, I had similiar problems to a previous poster, the fans wern't working properly so I took the spoties off to get me by while I sorted it out.
I was working around St George, Qld in January at the time, a couple of days had to drive with the heater on. Ended up being a dodgy relay.

I would have thougt that the main indicator to be looking for was how hard the electric fans were working.
Because the air flow is restricted the fans would be on full time, rather than whatever % they were designed for. ( I use the term "designed" loosely)

Cheers Glen

IF the airflow through the grill is of No consequence and blocking it doesn't make any difference then why is it on the truck in the first place?[bigwhistle]
Maintaining a Good airflow over the radiators is vital as far as I am concerned especially at low speed/low range when the engine/gearbox are working hard so that the viscus fan can do its job, Restricting the airflow can only be detrimental and restricting it isn't the Best practice.
Also when towing the engine and the gearbox are working much harder and they tend to run hotter So restricting the airflow Can create problems with overheating issues especially in high ambient temps.
Having Big spotties fitted are fantastic for night driving But there is a trade off because they Do tend to restrict the airflow and cooking an engine or gearbox can cost you a small fortune.
Next time you find your truck struggling to keep cool remove the spotties and see for yourself the difference this makes[thumbsupbig]

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Originally Posted by Dorian

In my D2, I had similiar problems to a previous poster, the fans wern't working properly so I took the spoties off to get me by while I sorted it out.
I was working around St George, Qld in January at the time, a couple of days had to drive with the heater on. Ended up being a dodgy relay.

I would have thougt that the main indicator to be looking for was how hard the electric fans were working.
Because the air flow is restricted the fans would be on full time, rather than whatever % they were designed for. ( I use the term "designed" loosely)

Cheers Glen

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The electric fans probably run whenever the aircon is on.

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Originally Posted by DiscoMick

The electric fans probably run whenever the aircon is on.

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On my D2a the fan only kicks in when the engine needs it or on startup Not dependant on the operation of the air con.

On my defender the electric fan kicks in when the aircon is on and vehicle is under 80 km/h.

If the engine is chipped that may make it run hotter??? But by how much??

I cannot speak for every single person and every situation out there but I can say that for me it has made no difference what so ever