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Outside air that enters cab?

[email protected] on Sun August 24, 2008 7:07 PM User is offlineView users profile

Year: 93
Make: Ford
Model: Ranger
Engine Size: 4.0
Refrigerant Type: R-134
Country of Origin: United States

Hi! My question is about the outside air that goes into the cab. I have a ford ranger that is set up for offroad (desert racing) and it has a 1 piece fiberglass frontend that covers the cowl vents near the windshield. It has cut outs for the windshield wipers and is not sealed from the engine heat so Im assuming that restricts some airflow that goes into the cab correct? If I seal it and make openings for more cooler air to flow with that make any difference in getting the AC colder in the cab?

Thanks for any help in advance

Cussboy on Sun August 24, 2008 8:38 PM User is offline

It sounds that right now you have the vents for outside air sealed off. If you allow outside air to mix with the conditioned air, the temperature will be a few degrees warmer. However, when you first start it up if it's been parked in the sun, the "inside" air will be considerably hotter than the ambient air, so it will take longer to get the cooling going. That's why it's generally recommended to start using outside air for a few minutes then switch to MAX/recirculating.

[email protected] on Mon August 25, 2008 6:00 PM User is offlineView users profile

Quote
Originally posted by: Cussboy
It sounds that right now you have the vents for outside air sealed off. If you allow outside air to mix with the conditioned air, the temperature will be a few degrees warmer. However, when you first start it up if it's been parked in the sun, the "inside" air will be considerably hotter than the ambient air, so it will take longer to get the cooling going. That's why it's generally recommended to start using outside air for a few minutes then switch to MAX/recirculating.


Ok im confused now....So if I seal of the heat from the engine and allow only the outside air to enter the vents it will get a few degrees warmer in the cab? Also with only outside air entering it will take longer for it to get cooler?

HECAT on Tue August 26, 2008 6:31 AM User is offline

Desert Racing with the A/C on; very cool!

The efficiency is in recirc mode by continuously reprocessing and cooling the same cabin air. Introducing ambient (outside air) temp air via the fresh air intake is considered adding a heat load that will (in most cases) increase vent temps.

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bohica2xo on Tue August 26, 2008 11:59 AM User is offline

In the desert racing environment, the last thing you want is outside air going over the evaporator.

Outside air brings with it a huge load of dust in that environment. Even the small ammount of condensate present in the desert will quickly turn that dust to mud. The condensate only gets wet enough to hold the dirt when it is dry out, compounding the problem.

Your best bet in a special application like this would be to make sure the recirculate door is closed & well sealed. Keep the cabin air as clean as you can.

I would be inclined to throughly clean the condensor, and look at a way to add a coarse filter or screen to the blower intake inside the cab. I see clogged evaporators on pickups that spend only 10% of their time on dirt roads. Dog hair + dust is the worst one.

B.

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"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

[email protected] on Tue August 26, 2008 8:22 PM User is offlineView users profile

I am planning on adding filter that is easily accessible since right though the large oval port that the the air flows into. I was going to add a rubber seal across the lower part of the cowl to block and keep the engine heat from entering the oval port and cowl area and drill a bunch of small holes into the top of the hood near the cowl so that outside air could enter. But if I am understanding correctly or I am just retarded I should just leave it?

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