Bongo Fury

Les W wrote: Sun Sep 09, 2018 10:52 am Having not noticed the fans coming I did a guick check by turning the aircon on,but only one fan was working so the question is,if one runs should the other ? 2.5 diesel with a cold engine and aircon is not all that good anyway..Thanks in advance

Merlot man wrote: Mon Sep 10, 2018 6:03 pm Hello all
On a related note I wonder if it's possible to replace the fans ,both coolant and air con fans , with more vigorous items I.e.to pull more air through ?
It would be important that they would fit into the same old housing as this seems well designed to draw the air through .
We bring our bus to France and their mountains every year so coolant system maintanence and improvements are always on the aganda !
Brian

Bonneville wrote: Fri Sep 14, 2018 8:02 am Does your engine overheat when in the mountains? Over cooling is almost as bad for an engine as over heating so I would only look to modify if you are sure you are pushing it beyond the limits of Mazda's intent.
If you do think more cooling is needed, the answer is in the radiator core, not the fans, in my experience. I've only modified cooling systems when stuffing bigger engines in cars not designed for them. In these circumstances the fans are irrelevant, it's all about the radiator core depth. Changing the width/height is usually impossible as you don't have the space so the core depth is increased to add surface area. Another trick was using the radiator from the diesel variant of a given car in a modified petrol one but our Bongos use the same rad so that won't help.
You can get aluminium cores off ebay in a variety of sizes but there are also places like this lot that will take a generic core and weld tanks on to suit the application:

https://www.custommaderads.co.uk

mikeonb4c wrote: Fri Sep 14, 2018 8:24 am

Bonneville wrote: Fri Sep 14, 2018 8:02 am Does your engine overheat when in the mountains? Over cooling is almost as bad for an engine as over heating so I would only look to modify if you are sure you are pushing it beyond the limits of Mazda's intent.
If you do think more cooling is needed, the answer is in the radiator core, not the fans, in my experience. I've only modified cooling systems when stuffing bigger engines in cars not designed for them. In these circumstances the fans are irrelevant, it's all about the radiator core depth. Changing the width/height is usually impossible as you don't have the space so the core depth is increased to add surface area. Another trick was using the radiator from the diesel variant of a given car in a modified petrol one but our Bongos use the same rad so that won't help.
You can get aluminium cores off ebay in a variety of sizes but there are also places like this lot that will take a generic core and weld tanks on to suit the application:

https://www.custommaderads.co.uk

That seems to make sense. I suppose the thermostat function should prevent over-cooling even if the cooling system is over-efficient (though it may not keep the engine at optimal temp even so)?