Vented Air Temperature - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 14 (permalink) Old 10-13-2007, 04:45 PM Thread Starter
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Vented Air Temperature

The weather is nice out these days and I like to drive with the air off and vent on. The air coming out of the vent is noticeably warmer than the outside air. (using the setting with the arrow pointing at drivers chest/head). Anyone else notice this? It's very frustrating, almost like the heat control knob isn't turned all the way down.

I pulled the knob off and turned the actual remaining dial the rest of the way down and that just made it go to max heat. That was a big surprise.

Anyway, just seeing if anyone else has the problem.
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post #2 of 14 (permalink) Old 10-13-2007, 05:17 PM
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Ya there always seems to be some heat creeping into the vent. I am not sure if the damper is designed to not close all the way or what. It's a pain.
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post #3 of 14 (permalink) Old 10-13-2007, 08:03 PM
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I haven't had real honest to gosh outsided vented air since my 1972 Plymouth Satellite Station Wagon. It's vent controls controls were seperate from the from the fan and heat. And every car since that experience, no matter what the dial indicated was putting out just a trickle of heat to full blast furnace mode. I thought my experience was typical, its not?

The Satellite had a knob low on the dash which you pulled out opening a channel of fresh air aimed directly at your crotch, perfect. So simple, why it has disappeared baffles me.
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post #4 of 14 (permalink) Old 10-13-2007, 08:36 PM Thread Starter
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I remember those old vents. They did rule. But I've never had one of my newer cars dump heat on me if the thermostat is turned all the way down until this Jeep.
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post #5 of 14 (permalink) Old 10-13-2007, 09:15 PM
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Ah yes, the old cable operated side mount forward facing vents---50's Studebaker style.

Or, vent windows that you could swing forward and blast yourself in the face!

Best vent, now-a-days, are sun roofs &/or vent visors.
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post #6 of 14 (permalink) Old 10-13-2007, 09:34 PM
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I've used just the outside vent air on a couple of days this past week when the outside temps were in the 50's. Didn't notice any discomfort. I'll be sure and pay attention to it next week. Would be a pain to have to run the A/C when the outside temp is in that "perfect" range.
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post #7 of 14 (permalink) Old 10-13-2007, 10:31 PM Thread Starter
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Yeah, 50's would be great. We're in that upper 60's to low 70's zone that is just on the cusp of A/C.
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post #8 of 14 (permalink) Old 10-14-2007, 01:58 AM
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It does seem warmer than the outside air, I wonder if it has anything to do with the hot air from under the hood passing over the cowl where it can get sucked into the car.
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post #9 of 14 (permalink) Old 10-14-2007, 09:57 AM
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Quote:
Originally Posted by YB Normyl
It does seem warmer than the outside air, I wonder if it has anything to do with the hot air from under the hood passing over the cowl where it can get sucked into the car.

Yes it does. The fresh air is sucked in through the cowl vents and then channeled through the HVAC system, which means that it gets sucked past the heater core. There's a motorized door that the thermostat controls which controls the amount of air that goes past the core. Unfortunately, the door is thin plastic so heat does radiate through it so it does heat up the air a little. That, combined with the fact that the air has to travel through the ductwork (no direct path) means that the vented air is always several degrees warmer than the outside air.

That's why I like my Bronco II: vent windows and straight through ventilation. Allows me to vent out the exhaust leaks better!

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post #10 of 14 (permalink) Old 10-14-2007, 11:35 AM
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I just use the windows and roof for my vent. With just the right tweaking, its not too loud and not too hard on the hair (for the wife). I would like to have had some back window venting ability.

RIP - Silver '06 Limited; 5.7 Hemi; 2" TerraFlex Lift; 255/70R17 Bridgestone Dueler REVOS, Horizontal Inclinometer, Signal Frog Antenna Ball, Surco Safari 50"x50" Roof Rack, GetLost4x4 bumper, Bulldog 9k Winch, GetLost4x4 Rock Rails - (should have added a snorkel)
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