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  1. J

    2001 Zephyr (Allegro bus) ISM 450 overheating issue, side radiator

    Thanks for the reply. When I was in there replacing the fan hub bearings I had the fans and shroud off and could see the entire back side of the radiator. I was even able to use a power washer to clean it from the back side. There was no major residue on it. My blow by tube runs down the side of...
  2. J

    2001 Zephyr (Allegro bus) ISM 450 overheating issue, side radiator

    I've owned this coach for the last 4 years now. We take a yearly vacation to the same location in Colorado every summer. The first year there was no problem. Every year since, it seems to heat up easier and easier. I do have 4 miles of dirt road to travel every time I leave my house. But I wash...
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