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In cold temperatures yes, once the engine is at operating temperatures or in warm temperatures no.
It's condensation caused the variance of temperatures.
I had the same problem with mine. It was the thermostat, it was sticking and would not open until the engine got very warm and would force the thermostat to pop open, then the car would fill with warm air until the engine got back within operating temps or cooler, then it would stick shut again.
its the same as you engine if you dont let the oils warm up during winter or very cold it will damage transmison.
The heads on a car are usually made of steel and require very high temperatures to melt. However they may become cracked if the car overheats.
Not a requirement, but a very good idea if you plan on keeping it for a while.
the air coming from the vent is warm
if your car cannot warm itself up when your not in it, then yes it would be a good idea to let it warm up a few minutes before driving.
When temperatures are -53 with the wind chill, it can affect a car. The cold temperature can make the car hard to start, the engine will be slow to warm up, and the rubber on the tires can harden causing the tires to lose grip.
under low temperatures, this > > equipment automatically starts and i can hear it running; the problem is > > that when i stop the car, i feel a very bed smell, ... I've noticed it occasionally, but not the smell > getting inside the car - my TiD has the ACC heater so maybe this stops > it. Do you have ACC or a manual heater
Varies by manufacturer. Most Imports will run coolant temperatures when the engine is warm in the 180-210F range and domestics run 210-250 in many cases.
You should never run your car when it is not warm enough. More than likely you need a transmission fluid change, and the filter as well. Which is quite easy, but I would advise you to never run your car until it is fully warm enough for the car to be driveable.