andi4eyes Posted October 12, 2020 Share Posted October 12, 2020 Another question about my new to me Classic VX ex Grad racer. This time about cooling and coolant.On the weekend I realized that the car doesn't get warm. I'm sure that was accentuated by the colder weather compared to when I drive the car last. I didn't think about that before but this must mean the car runs without a thermostat. For my drive on Sunday I taped up most of the nose cone which helped to get the temperature close to 80. Next time I will tape up a bit more or block the radiator itself to get the temp a bit higher still.I have ordered a febi thermostat for that GM engine code that should arrive mid week. Am I correct in thinking that I should only have to top up my coolant and be done with it or do I have to bleed the system somehow?I hope the coolant question isn't as controversial as an oil question ;-) I've noticed that the coolant in the car is (very) orange. Given that it is a Caterham serviced by a Caterham race support shop I concluded that this might be the Motul Inugel Optima that CC sells. Or another orange OAT based antifreeze. All IAT antifreeze products I found seem to be blue. Now given this engine is what I would call classic I would have thought I should use a IAT based antifreeze. I do have a new ally radiator, might that be a reason why it's okay to run a OAT based coolant? What are your thoughts on that? Link to comment Share on other sites More sharing options...
Tazio Posted October 12, 2020 Share Posted October 12, 2020 Alloy Rad, use the blue stuff. Link to comment Share on other sites More sharing options...
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