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Last week I drove from Nashville to Cincinnati. It was a cool, drizzly to rainy day, not much traffic but several construction zones and the rain kept my speed on this trip reasonable low. At one point traffic came to a stop for a few minutes and I notice what looks like steam coming out of the front of my car. I check the coolant temp display and it looks normal and so I assume that rain must be hitting the radiator and creating the steam or something similar. After a short time traffic starts moving and I pull into a rest area. I sit in the parking spot with the engine running for a few minutes and see no further steam coming out of the front of my car.

So was it rain hitting the radiator or is something else causing this?
 

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If you want to test this out, get your car up to operating temperature and run through a car wash to look for steam. It's a comfort knowing the theories are correct.
 
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