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Old 02-25-2019, 01:33 PM
Fifty150hs Fifty150hs is offline
Join Date: Jul 2016
Location: Menlo Park, CA
Posts: 1,031
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Originally Posted by Russianblue View Post
ok, so here's the update. I replaced the bad thermostat and am now cruising at 90-93 instead of 78-80.

I put in a new heater valve.

I replaced the water pump and serp belt while in there even though the old one only had 50k miles on it.

The heater blows much hotter, which is excellent, but still no heat on AUTO from the vents. My theory is that the little wheel on the center vent that mixes hot air and cold air is broken. There is ZERO reaction when I roll that wheel from hot to cold or cold to hot. Is that a complex system involving multiple servo motors etc?
You're in luck, no servo motors. The wheel just moves a Bowden cable. It's likely either disconnected or broken.
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