If you've ever wondered if can you start a diesel truck while it's plugged in during a brutal winter morning, the short solution is a resounding yes. You aren't going to trigger an electrical surge that fries your engine, and you aren't likely to break the heater itself. In fact, most veteran diesel owners do this nearly every early morning once the heat drops below getting stuck. It's a common part of the winter routine, yet there are a few little nuances and safety tips you should probably know before you go turning the important thing.
The principal reason you've got that cord hanging out of your billet grille is to keep your engine block warm. Diesel engines rely on compression ignition, and when steel components are freezing cold, that procedure is a great deal harder to kickstart. By plugging in the block heating unit, you're basically keeping the coolant—and by extension, the engine block—at a temperature that makes this feel like it's a mild springtime day instead of a mid-January blizzard.
Why it's perfectly safe in order to turn the important thing
The block heating unit in your truck is a pretty simple device. It's essentially a heating element, much such as what you'd find in an electric kettle or an old-school water heater, submerged in the engine's coolant. It operates on standard ALTERNATING CURRENT power from the home. The truck's inner electrical system, nevertheless, runs on DC power through the batteries. These two techniques are completely impartial of each various other.
When you start the particular truck, the starter motor draws energy from your batteries to turn the motor. The block heating unit just keeps performing its thing, sitting in the coolant jacket and radiating heat. The heating unit doesn't "know" the engine is working, and the engine doesn't "know" the heater is on. There is no physical or electric reason why these people can't coexist regarding a few minutes while you're letting the oil move.
In fact, keeping the heating unit on while the particular engine starts can actually be a little bit of a benefit. Since the coolant is already cozy, your cabin heater will start throwing out lukewarm air very much faster than in the event that you started through a dead chilly. We've all already been there—sitting in the particular cab with the breathing visible, waiting ten minutes for that defrost to finally stop in. If you're still plugged in during those 1st few minutes of idling, you're just giving the system a little mind start.
The particular biggest danger isn't electrical
In case there's one reason people warn towards starting while plugged in, it isn't because of the particular engine; it's since of human mistake. The real "danger" is the extension cable .
It's incredibly easy to jump in the cab, start the engine, obtain distracted by a podcast or your own phone, after which shift into drive and pull away while the cord continues to be attached to the house. I've observed it happen a lot of times. You end up either ripping the cord out of the wall, snapping the plug away from your truck, or—in the worst-case scenario—damaging the heater cord assembly in the engine bay.
Some guys like to loop recognized cord through the driver's side door handle or over the side reflection as a visible reminder. If you have to proceed the cord to get into the truck, you're much less likely to forget about it's there. When you're starting the particular truck to allow it warm up while you return within to finish your coffee, just make sure that cord is tucked away through any moving parts like the chilling fan or the serpentine belt.
Just how long should you stay plugged in?
Another issue to consider is the fact that once the motor is in fact running, the block heater becomes redundant pretty quickly. A running diesel engine generates a massive amount of heat by itself. Within a couple of minutes associated with idling, the water pump is distributing that coolant, plus the combustion procedure is warming the block far more efficiently than a 400-watt heating element actually could.
Many people recommend unplugging the truck as soon as you've got this running and you're ready to stay in the cab. There's no real benefit to leaving this plugged in for 20 minutes while the truck idles in the front yard. You're just spending electricity at that will point.
Also, keep in mind that you don't need to leave your truck plugged in most night if it's not that cool. Usually, 3 to 4 hours before you plan to drive is sufficient of time regarding the heater in order to do its work. A lot of guys use heavy duty outdoor timers therefore the truck only starts drawing energy at 3: 00 AM for a 7: 00 WAS commute. It saves a few bucks on the power bill and decreases wear and tear on the heating element.
Does it help with battery power life?
While we're speaking about starting the truck, it's worth mentioning that will the block heating unit doesn't actually cost your batteries. If your batteries are poor, the truck may still struggle to start even when the block is definitely warm.
However, because the engine oil is definitely thinner (thanks to the heat) plus the cylinders are warmer, the starter motor doesn't need to work nearly as hard. This indicates the batteries don't need to provide because much "cranking amps" as they might if the engine were an glaciers cube. So, indirectly, yes, being plugged in makes existence easier on your batteries as well as your beginner.
If you find that your own truck still challenges to start actually when it's been plugged in, you might want in order to look into a battery pack blanket or a drip charger. Those are usually separate systems that will can also become plugged in alongside your block heating unit to ensure your electric batteries stay at maximum performance during a get cold.
Common myths about block heaters
You may hear some "old-timer" advice suggesting that will starting the truck while plugged in can "burn out" the heater. The theory is that the moving coolant might trigger a localized hot spot or something along those outlines. In reality, modern block heaters are built to handle the turbulence of flowing coolant.
Think about it: the heating unit is just a metal rod. It's designed to be submerged. If anything, the movement of the particular coolant while the engine is idling helps distribute that will heat more equally throughout the program. There's no evidence that it reduces the length of the lifespan associated with the element. These types of things are fairly robust; they usually last for yrs, if not the life of the truck, provided the coolant is kept clean and the cable doesn't get frayed.
Another misconception is that you can't use a remote start if the truck is plugged in. This is definitely also false. Many modern diesel vehicles come with manufacturer remote start specifically because the manufacturers know people reside in cold environments. They fully anticipate you to have the truck plugged in and strike that remote start button from your own kitchen window.
Tricks for a soft winter start
If you're dealing with temperatures regularly below zero, here's a quick checklist to keep points running smoothly:
- Check your own cord: Prior to the season starts, inspect the plug in your truck. Look for corroded prongs or frayed cables. A little bit of dielectric grease can proceed a long way in preventing moisture from leading to a short.
- Use a heavy-duty extension wire: Don't use a slim indoor cord. You need a 12 gauge or 14-gauge outdoor-rated cord that can handle the amperage draw without getting hot.
- Wait for the shine plugs: Set up truck is definitely plugged in, you should still wait around for the "wait to start" light (the little pig-tail icon) to visit away from. The block heater warms the coolant, but the shine plugs warm the particular combustion chamber. Making use of both together may be the secret to a fast, smoke-free start.
- Pay attention to your engine: If the truck sounds such as a bag of hammers in order to starts, that's normal for a diesel in the cold, yet it should lessen quickly. If it doesn't, you may need to keep it plugged in longer next time.
So, the next time you're staring out your windowpane at a snow-covered driveway, don't be concerned about the cable. Go ahead and start that animal up. Just, intended for the love of most things holy, make sure to unplug it prior to you back out from the garage. Your expansion cord—and your house's electrical outlet—will say thanks to you.