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Re: What does this part do differently?
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Posted by MI-Roger [Email] (#882) [Profile/Gallery] (more from MI-Roger) on Wed, 12 Sep 2012 13:52:14 Share Post by Email
In Reply to: What does this part do differently?, Mike J in Montana, Wed, 12 Sep 2012 12:27:48
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The Coolant By-pass Valve (CBV) is factory equipment only on cars with Automatic Climate Control, or ACC. Cars with Manual Climate Control (MCC) do not have this added part. All US Spec cars came with ACC whereas it was an option in many other parts of the world.

The only thing the CBV does (besides fail without warning and dump your precious engine coolant onto the roadway) is to by-pass engine coolant around the heating coil in the HVAC system whenever the ACC calls for Maximum Cooling. When by-passing the engine coolant the HVAC system sees a small increase in cabin cooling capacity. But since cars with Manual Climate Control have adequate cooling without this added complexity, the advantage is unnecessary. 


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