bmking16 Posted January 12, 2014 Share Posted January 12, 2014 My brother went to move my truck today and noticed an air leak from the vent in the middle of the hood. Does anyone know what controls this? Is it controlled by the heater controls? Quote Link to comment Share on other sites More sharing options...
Baxter Posted January 12, 2014 Share Posted January 12, 2014 Air cylinder opens the vent to take in fresh air for heater. Cylinder probably leaking. Quote Link to comment Share on other sites More sharing options...
phildirt Posted January 12, 2014 Share Posted January 12, 2014 Can be either an air or an air/ electric cylinder. Mack wants about $450 for a new one last time I looked. Plug off the air line and happy motoring. Quote Link to comment Share on other sites More sharing options...
Superdog Posted January 12, 2014 Share Posted January 12, 2014 Yeah,I priced one awhile back and about spit my chew on the partsman when he told me. What makes that little piece so hi priced? Quote Link to comment Share on other sites More sharing options...
bmking16 Posted January 13, 2014 Author Share Posted January 13, 2014 Thanks as always for the info guys! Phil pluggin that up won't bother anyting? Quote Link to comment Share on other sites More sharing options...
phildirt Posted January 13, 2014 Share Posted January 13, 2014 You just won't have the "fresh air" coming in. It will still work just as it does now- nothing to brag aboout but better than a B 75. Normally that vent opens only when the heater is in the "maximum" posiiton. I never could see much difference. Not worth nearly that much. Quote Link to comment Share on other sites More sharing options...
bmking16 Posted January 13, 2014 Author Share Posted January 13, 2014 Ok perfect, thanks again! Quote Link to comment Share on other sites More sharing options...
felicello122 Posted January 14, 2014 Share Posted January 14, 2014 just lets more dirt in because mack doesnt believe in fresh air filters! Quote Link to comment Share on other sites More sharing options...
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