I put one cup of Rain-X in my engine coolant spot. I already started the car and ran it for about 5 to 10 minutes not sure what I should do
My car has 80000 miles.
My car has an automatic transmission.
Hi there - while this may not cause overheating, it will not improve cooling as you intended. Rain-X(R) causes water to bead up on a windshield - that is - to NOT stick to it. You want the opposite in a cooling liquid - to make the coolant attach to the engine block surface for the most efficient transfer of heat to the coolant. There are products that help this process - WaterWetter(R) for example. I would highly recommend having a coolant flush and refill with fresh antifreeze by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, make this repair, and get your cooling system back in order.
Have a car question? Get free advice from our top-rated mechanics.
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing