My downloaded Beaver has a slider type carb air heat control which cannot be moved.     Equally, selecting button 'H' has no effect.     The carb air runs hot all the time.     Does anyone have any ideas as to how I may rectify this?

Yes you do. Like when you want to cool it down. 
I was aware of the options.     What I wanted to know was how to make the controls work.
I appreciate the response but it doesn't really address that problem.

Thank you 1olehippy.      To be honest, I'm not entirely sure.     I think it's the Woodward wheeled version (Sim:Bvr 7W).

Or maybe search for "the effect of carb heat on the max power produced by the engine"

You want carb heat OFF for takeoff so you can get max power...

-Crossfire- wrote on Jan 30^th, 2011 at 5:25pm:


Depends the flight conditions.
In fact, if you want max power, then you want the carb temp to be in the green zone.
Normally it's quite easy, even with cold weather, to reach the green zone once applying some thottle.

But when you're flying, it's a different story.  You might reach a point/altitude where the engine power is not enough to maintain a correct carb temp anymore. There, you'll have to activate carb heat.

The author of the topic was complaining about his carb temperature running too hot all the time. I don't think a "carb heat" button will help him in that case

Does that mean that you can get carburator icing even if the carburator air temperature is above 0°C ?

The original poster told this:
rafair wrote on Jan 28^th, 2011 at 9:51am:

Do you mean that the formation of ice in the carburator can cause an increase of the carburator air temperature ? And that activating carburator heat would actually make this temperature decrease ? 

Hagar wrote on Feb 1^st, 2011 at 3:58am:

Is it really switched on, or is he pushing his engine too hard ? I think his plane has no carb heat, but the carb temperature is raising because of the way he is using the engine. Thus my advises above.

Carb heat just re-directs hot air from the manifold into the carburator air intake, this warm are ensures that no ice forms in the carb......essentually everytime you close the throttle you need to apply carb heat.......and when you open the throttle then you turn off the carb heat.

Next time you are sitting on the ground getting ready for take-off take a look at your RPM and then pull on the carb heat, now watch your RPM drop about 100 RPM that tells you that your carb heat is working.......it's actually to bad that FS doesnt model carb ice, because the use of carb heat is a very important step in the procedure of flying a normally asperated piston motor........nothing spoils a perfectly good approach like your engine coughing and choking on short final when you realise you need a little more RPM to make the piano keys and you got nothing when push on the throttle     .........an essential part of any downwind checklist is "carb heat on"----check  .....almost as important as "gear down"

I think this is getting way off-topic. I'm not sure carb icing is simulated  in MSFS. In his original question rafair wanted to know if the carb heat on his FS9 Beaver can be switched off.
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It would help to know which Beaver we're talking about. I assume there is an entry in the AIR file or Aircraft.cfg that affects it.