Full Floater Posted November 16, 2023 Share Posted November 16, 2023 So....the sticker on my factory heater blower motor says to use the cowl vent for ram air heating. When I have the cowl vent open (there are no obstructions in it that I can see) I have very little ram air effect coming in even at highway speeds, so I end up having to use the fan anyways. Am I missing something here in the cowl operation? Is it normally as effective as the sticker makes it out to be? Would be nice to have ram air instead of using the fan. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/73547-r-model-cowl-vent-operation/ Share on other sites More sharing options...
JoeH Posted November 17, 2023 Share Posted November 17, 2023 I've never bothered using mine, not even sure they work on our trucks. I believe they open facing the windshield. Cold temps I just run the fan. Summer I use the roof and side vent plus the driver wing window. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73547-r-model-cowl-vent-operation/#findComment-542138 Share on other sites More sharing options...
Full Floater Posted November 19, 2023 Author Share Posted November 19, 2023 On 11/17/2023 at 3:13 AM, JoeH said: I've never bothered using mine, not even sure they work on our trucks. I believe they open facing the windshield. Cold temps I just run the fan. Summer I use the roof and side vent plus the driver wing window. Thanks. Ya they seem redundant....I feel like they should do at least a little something otherwise they wouldn't be there, kinda like a Dynatard. But maybe not. Quote Link to comment https://www.bigmacktrucks.com/topic/73547-r-model-cowl-vent-operation/#findComment-542223 Share on other sites More sharing options...
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