It's finally getting cold here in the south. In the summer I use my remote start to cool the truck down before I get in. When I get to the truck I notice two distinct puddles of condensation under the truck from the A/C.

Now that it's cold, I have been doing the same to pre-heat the truck and I'm noticing the same two puddles under the truck (They appear to be water, not oil, trans fluid, antifreeze, etc). I'm confused because I wouldn't expect the A/C to be running to heat the truck when the ambient temperature is 20 degrees F. Can anyone explain this to me? Is this normal?

Thanks!

 

The A/C is really good at is dehumidifying the air—and that’s the perfect thing to alleviate those fogged-in windows.

http://www.automotive.com/news/when-...od-thing-6951/

 

I can't say specifically for the 15+ F150, but generally when the temperature gets much below 40F a modern vehicle won't run the AC compressor. If it's 20F, perhaps there was frost somewhere that's being thawed and running off?

 

AC compressor is needed for defrost as well.

The second puddle of water is coming from your exhaust, there are two drain holes on the muffler that will spit a good amount of water when it's cold.

 

The AC will run in the winter with the defroster on to de humidify and keep window's clear

 

Thanks to everyone for the answers, they all make good sense! I didn't think about it turning on the defrost (A/C) with remote start, makes me feel stupid now... LOL

Thanks again!!!!