The coolant is usually water, and tomato sauce is mostly water and has a heat capacity of roughly 90% that of water. The other properties should be pretty close to water too. The cooling system is certainly designed with way more margin than 10%.
The coolant pipes are (nowadays) stainless steel or an even more corrosion resistant alloy, so corrosion is not an immediate concern (long term on the scale of years, probably, at least more concern than with water).
The pumps are almost certainly capable of handling the increased viscosity of the sauce.
So overall I think it would be fine, at least for months and probably years.
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u/SubjectMountain6195 4d ago
What if instead of coolant we add tomato soup?