Quote:
Originally Posted by Camohall
What about the reverse? Could it be the monovalve that is going bad when there's no heat at all?
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Yes it could. When that diaphragm tears, it can present either symptom. A small tear seems to make it not want to open due to fluid getting behind the diaphragm while a large tear just lets the coolant rush past.
Another possibility is the coil, but if the coil was blown (open), you would get heat constantly.
Frankly, I'm surprised I haven't seen more bad coils. They are often wet with coolant when you pull them out, which makes me wonder why I have yet to see one that is burned up.....