I have a major increase in air flow , pressure(relieved by relief valve), and noise when I select cabin heat or defrost air.  Should this air be reduced by venturis in warm-side pressure hoses from the intecooler?

 

I’m looking for a set of assembly manuals for a serial # 411 era kit.

 

Also would appreciate input from any Thermawing owners—I can’t keep a drive pulley or belt on.

 

Thanks,

Tim

LNC4,  N524JG