The best replacement for coolant is antifreeze.

The best alternatives to coolant are rated as following:
★★★★★  antifreeze
★★★  water
★★★  distilled water
★★  water in radiator
★  green coolant
★  refrigerant
★  transmission fluid
★  dex cool
★  radiator fluid
★  orange coolant
★  prestone
  water wetter
  cutting oil
  freon
  water car
  dexcool
  gold coolant
  red coolant
  50/50
  auto coolant

Your alternative for coolant is not listed? Suggest!
Speaking about coolant, one probably shouldn't forget about distilled water.

Other search terms related to coolant and their ratings are:
★★★★★ distilled water
★★★★ tap water
★ g12
★ dex cool
★ green coolant
You have in mind a companion for coolant and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of coolant in all years. Click on graph for more.
coolant
antifreeze
water