For model: 1986 300E

Everything I have researched on the monovalve tells me that if my heat is always on or coming in and out, I should replace my monovalve.

However, this is not the case. I have zero heat. Coolant levels are fine. Fuses in main box under the hood are all fine. The blowers are all still strong. I have inspeced my monovalve and the gaskets all look good. If it is a monovalve problem, maybe the electromagnetic coil isn't working anymore. I do have a different unit than most models, see the picture below.

Are there any other suggestions why my heat won't turn on? If it is a heat sensor problem, or misc., can you please give me an idea how to tackle that problem.

Thanks a ton. It's getting cold and I need to get that heat working again.

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'86 300E (241K)