Topping up coolant, 1990 NA

Engines, Transmissions & Final Drive questions and answers

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Forgiven
Fast Driver
Posts: 102
Joined: Thu Sep 28, 2017 1:19 pm
Vehicle: NA6
Location: Canberra

Re: Topping up coolant, 1990 NA

Postby Forgiven » Tue Feb 25, 2020 9:56 am

Thanks RS2000. Comforting and clear.

project.r.racing
Speed Racer
Posts: 3722
Joined: Sun Jan 18, 2009 10:16 pm
Vehicle: Non MX-5
Location: Glasshouse Mountains, QLD

Re: Topping up coolant, 1990 NA

Postby project.r.racing » Tue Feb 25, 2020 10:44 am

For how much the expansion tank holds, I wouldn't be too worried about the mixture ratios.

As the motor gets hot and the coolent expands, the mixture gets sucked in and out of the tank. The 400ml (or 100-200ml top up) of whatever is in there is not really gonna change the 7000ml inside the whole system.

If you are worried about have 32 or 34% coolant ratio instead of the prescribed 33%, then pour a little of A and B into the expansion tank to top up.

I personally only top up using straight coolant, as I am not worried about a 35 or 37% ratio as you can go up to 50% anyway depending on the situation etc.


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