With the servo, if everything works as it should except it just isn't blowing hot air I know of a way to fix it. After the servo has been removed there are like 3 small holes in the bottom. They will be slightly larger than a spray straw that would be on wd-40 for example. Spray carb cleaner in there then lots of wd-40. Try and get as much of the stuff out and you may be surprised when you plug it back in.
My mechanic told me to do that and it fixed mine. There are gears in there and they can sieze over time. Let me know if this works for you or if you need further instructions.
Thanks
David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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