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I had the same random problem. The Dealer diagnosed it as a worn out blower motor and ordered a new one that took six months to arrive from China. In the meantime the old blower had begun working consistently so I left the new one in the box. A year later the old blower completely stopped so I had the new one installed. No problem since.
I am on my second Heat/AC control unit. The lights dont come on, no blower, nothing. Then all of a sudden it lights up and blows very well. I figured it was the head unit so I replaced that and it was all fine for about 3 months. Then the problem returned again. Is it the Automatic Temperature Control gizmo? I have the newer head unit, not the one with the levers.
Thoughts?
Gonzo
Have a bud with a Amigo same prob. Hooked to battery it ran. To heater control no way. After replacing the heater switch, resistor, New motor fixed it.
This is the exact problem I've been having! Ordered a new blower motor that should be here next week. We'll see if it resolves this. I hope so!
Currently having this same issue - purchased a new blower motor on Amazon for $46 (free shipping). Decided to also order the resistor as a "just in case"...
-- JOhn
Just got off the phone with Merlin - that's one expensive relay at around $160. I'm going to wait until I swap the blower motor to see if that fixes things before buying the relay (which I was going to order in case the motor didn't fix things)...