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How and where to refill Alde heater fluid

| Updated Jun 20, 2023

If you've listened to the podcast or read my blog, you've heard me talk about the Alde hydronic heater we have in our Roadtrek RV.

While it doesn't need much maintenance, you do need to top off the glycol, or anti freeze, levels from time to time by checking a reservoir located inside a closet on the coach.

I've received several requests for me to do a show and tell video on the process so, when I found my levels pretty much bone dry the other day, I handed Jennifer the camera and we shot this…

The antifreeze we used in our Alde is called Cryo-Tek and it's available from Amazon.

You can also order it at Home Depots across North America.

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Mike Wendland

Published on 2017-11-07

Mike Wendland is a multiple Emmy-award-winning Journalist, Podcaster, YouTuber, and Blogger, who has traveled with his wife, Jennifer, all over North America in an RV, sharing adventures and reviewing RV, Camping, Outdoor, Travel and Tech Gear for the past 12 years. They are leading industry experts in RV living and have written 18 travel books.

One Response to “How and where to refill Alde heater fluid”

September 11, 2018at1:25 am, Kevin Keen said:

Hi Mike,

The Alde system in the Roadtrek motorohomes uses aluminum parts. The corrosion inhibitors in regular Cryo-Tek will eat away at the aluminum. The producers of Cryo-Tek also produce a formulation known as Cryo-Tek AL which has the proper corrosion inhibitors for aluminum systems.

The UK webpage for Alde systems notes that the current Alde coolant standard is G13. This is coolant used in Volkswagen, Audi, and Porsche engines. It is readily available at these dealerships and I would suspect a few automotive retail stores. In Canada, you can find it readily available at Canadian Tire.

I notice you posted your Youtube video 10 months ago (7 Nov 2017). Unless Roadtrek or Alder representatives say different, you should immediately replace the Cyro-Tek with with Cryo-Tek AL or G13, let it soak (or, better, run the system for awhile), then replace the coolant a second time again. The corrosion inhibitors in Cryo-Tek may only last 2 years but it is 5 years for G13. It is the lifetime of the corrosion inhibitors that determine when the antifreeze coolant should be replaced.

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