andyb Posted December 4, 2017 Report Share Posted December 4, 2017 I've had some minor coolant leakage (a couple of tablespoons) that seems to be coincident with the cold weather and the Tannis heater being turned on prior to flying. As I understand it, this isn't an issue. However, the pink fluid level is only about 1/4 inch above the minimum line, so I ordered some of the fluid (Prestone) that's recommend in the Rotax fluids guide. Is it a problem if I add this fluid on top of the fluid that's already there? My plane is serviced by a CT/Rotax service center, so I'm confident that the fluid that's already there would be right. Thanks, Andy Link to comment Share on other sites More sharing options...
Tom Baker Posted December 4, 2017 Report Share Posted December 4, 2017 Prestone Dexcool 50/50. Just add to what is in the coolant bottle. I like to fill to the top of the notch in the bottle. It might also be a good idea to pop the radiator cap off and check the level there to make sure it is to the top. Link to comment Share on other sites More sharing options...
Roger Lee Posted December 4, 2017 Report Share Posted December 4, 2017 What Tom said or you can also top off with just distilled water. Link to comment Share on other sites More sharing options...
andyb Posted December 9, 2017 Author Report Share Posted December 9, 2017 On 12/4/2017 at 10:17 AM, Tom Baker said: Prestone Dexcool 50/50. Just add to what is in the coolant bottle. I like to fill to the top of the notch in the bottle. It might also be a good idea to pop the radiator cap off and check the level there to make sure it is to the top. I purchased the regular Prestone Dexcool. Can I just mix it with equal parts water? Andy Link to comment Share on other sites More sharing options...
Ed Cesnalis Posted December 9, 2017 Report Share Posted December 9, 2017 3 minutes ago, andyb said: I purchased the regular Prestone Dexcool. Can I just mix it with equal parts water? Andy distilled water Link to comment Share on other sites More sharing options...
Anticept Posted December 9, 2017 Report Share Posted December 9, 2017 The cost of regular dexcool plus distilled ends up being about the same as premix, so I don't bother with anything but 50/50. If you have an old bottle, dump half in it and then top both with distilled. Link to comment Share on other sites More sharing options...
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