Piston Slap: Fear No Polar Vortex!

Sajeev Mehta
by Sajeev Mehta

Joel writes:

My family is a Volvo family. Volvos are from Sweden and they take winter very seriously. There are a number of ‘winter’ climate options that were, at least at one time, available on Volvo’s cars. For instance:

  • Parking Heater
    Sometimes known as a ‘Fuel Driven Heater’ or after one of the popular brands Webasto, Espar, Eberspacher.
    This is essentially a tiny gasoline or diesel (from the car’s fuel tank) furnace, mounted under the hood, that is plumbed into the car’s cooling system and hooked up to the climate controls. You start the heater remotely, and it heats the coolant and pumps it through the system, heating the engine and supplying heat to the cabin heat exchanger. Some can even use the car’s climate systems to turn on the blower fan and fully heat the cabin.
  • Pause Heater
    Sometimes known as a ‘Residual Heater’ or “Rest Heater’ on BMWs. This is an electric coolant pump, plumbed in with the cabin heat exchanger. When you turn the car off there is a lot of heat stored in the coolant, but only a tiny amount of it is left in the cabin heat exchanger. You press the ‘Rest’ button and the electric pump moves the coolant around so you can run the cabin heater for about 10 minutes after the engine is turned off.
  • Electric Cabin Heater
    This is an electric space heater that you place inside the cabin. Of course it’s got over-temp and tip-over systems so it won’t catch anything on fire.

Are any of these options available on ANY car sold in North America now?

Sajeev answers:

Questions like these remind me why I am so fond of the comments from the Best and Brightest in this series. Because my knowledge of this topic is weaker than most, and PR folks aren’t lining up fancy new press cars in my driveway. But I got a plan, son. I got me some Google and we got the Best and Brightest, baby!

So anyway:

  1. Parking Heater: Well, Volvo’s still got it! But it’s a dealer installed accessory, if that matters.
  2. Webasto still makes one, fitting many a VAG product in Europe. I’d be shocked if manufacturers in North America follow suit, even if the concept’s proven itself in American RVs and 18-wheelers. No matter, Webasto’s own video implies it’s somewhat universal:
  3. Pause Heater: The BMW Rest system is/was a neat hallmark of the brand, but there’s conflicting info on the ‘net about whether it still exists in this age of i-Drive, start-stop equipped BMWs. Perhaps a trip to your local dealership to question the i-Drive skills of a sales expert is in order!
  4. Electric Cabin Heater: These are standard fare in every Nissan Leaf and Tesla Model S, as they have no internal combustion to feed you hot air! Cuz hot air is the job of their greenwashing-marketing departments! I kid, I kid!
  5. Even the darling of the Hybrid world, the Toyota Prius has an electric heater. It’s entirely possible that super-uber luxury cars use this electric helper and a conventional heater core from the cooling system. But, but, BUT…many cars sport seat heaters, steering wheel heaters and (drum roll please) the new S-class has armrest heaters!

Considering the electrical load of trying to heat an entire cabin, don’t be surprised if heating your ass, your back, your hands and your elbows does the same thing but far more efficiently. Get into those warm items and soon enough the conventional heater will have your back. And everything else. Literally.

Send your queries to sajeev@thetruthaboutcars.com. Spare no details and ask for a speedy resolution if you’re in a hurry…but be realistic, and use your make/model specific forums instead of TTAC for more timely advice.


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  • Mieden Mieden on Apr 03, 2014

    I know for a fact Mercedes made "REST" available in 1989 with the R129 SL and everything after. BMW had a similar system available on early E32/34 cars through the "timer" function of their "On-board Computer" system, but it was much less efficient and they removed the function from those cars during their mid-cycle update.

  • Toshi Toshi on Apr 04, 2014

    Electric resistive heaters are old hat. What's hot are the heat pumps found on the Tesla Model S, the 2013+ Nissan LEAF SV and SL, and the Toyota Prius PHEV prototype (but sadly not the production model). Being able to move 3-4x as much heat from ambient air outside into the interior as is put into the system is so much better than the 1.0 coefficient of performance of resistive heaters, by definition.

  • Tassos Before you rush to buy this heap of rusty metal, maybe you should wait a day or two.I hear Tim will have an Model T next time.
  • Redapple2 I d just buy one already sorted. Too many high level skills (wiring, paint, body panel fitment et. al.) that i dont have. And I dont fancy working 100 s of hours for $3 /hour.
  • 28-Cars-Later I'm actually surprised at this and not sure what to make of it. In recent memory Senator Biden has completely ignored an ecological disaster in Ohio, and then ignored a tragic fire in Hawaii until his handlers were goaded in sending him and his visit turned into it's own disaster, but we skipped nap time for this sh!t show? Seriously? We really are through the looking glass now, "votes" no longer matter (Hillary almost won being the worst presidential candidate since 1984 before he claimed the crown) and outside of Corvette nostalgia Joe doesn't care let alone know what day it happens to be. Could they really be afraid of Trump, who AFAIK has planned no appearance or run his mouth on this issue? Just doesn't make sense, granted this is Clown World so maybe its my fault for trying to find sense in a senseless act.
  • Tassos If you only changed your series to the CORRECT "Possibly Collectible, NOT Daily Driver, NOT Used car of the day", it would sound much more accurate AND TRUTHFUL.Now who would collect THIS heap of trash for whatever misguided reason, nostalgia for a much worse automotive era or whatever, is another question.
  • ToolGuy Price dropped $500 overnight. (Wait 10 more days and you might get it for free?)
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