The first thing I do when I buy a used rig at auction is skip the cosmetics entirely and go straight to the mechanical systems. How a previous owner maintained the furnace, the AC, the water heater — that tells me everything I need to know about how the whole coach was treated. On the Winnebago Ekko, the diesel heater is one of the first things I pull up on diagnostics, because a neglected glow plug or fuel pump is almost always the reason these units throw fault codes, fail to ignite, or just blow cold air at 2 AM in January — and nine times out of ten, the previous owner had no idea what was wrong and just stopped using it. The good news is this is a completely serviceable repair if you know the system, and catching it early is the difference between a $40 fix and pulling the entire heater core. This guide walks you through exactly what I do when I’m diagnosing and servicing the diesel heater on an Ekko, based on real failures I’ve seen on rigs I’ve bought, repaired, and put back on the road.
The Glow Plug That Finally Stopped the Cold-Start Guessing Game
A weak or fouled glow plug is the silent killer of diesel heater diagnostics—it’ll throw codes, fail to ignite on cold mornings, or leave you troubleshooting the fuel pump and control panel when the real culprit is sitting in the combustion chamber. I’ve learned the hard way that replacing it early beats chasing ghosts through the entire heating system.
What works
- Ceramic construction handles repeated thermal shock cycles without cracking, which matters when you’re firing up the heater in 20-degree mornings then shutting it down at noon.
- Drop-in replacement—no adapter nonsense or fitment guessing; it screws into the combustion head the same way the original did, and the ignition sequence recognizes it immediately.
- Cuts your cold-start time noticeably; I went from 45 seconds of stuttering to a clean ignition in under 10, which also tells you the fuel pump and control panel are probably fine.
What doesn’t
- Requires pulling the heater shroud and getting into tight quarters—not a 5-minute job if you’re not familiar with your Ekko’s layout.
- Won’t solve a fuel pump issue or clogged filter on its own; if the heater still won’t start after this swap, you’re looking downstream.
I’ll admit I second-guessed myself halfway through the replacement, convinced I’d broken something inside the combustion chamber just getting the old plug out—but the moment that new ceramic element glowed orange and the heater fired up on the first attempt, it was clear money well spent. Grab a Webasto / Espar ceramic glow plug and have it on hand before you buy any auction rig.
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