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  #1  
Old 06-08-2010, 01:07 PM
Bryson Bryson is offline
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Default A/C Question

Hey There!

Own a 2000 Ford Ranger XLT (4 cyl). Recently relocated to TX and have been using the A/C a LOT more (obviously). Noticed that when I accelerate, either in town or on the highway, that the flow of air from the vents drops to basically nothing. When the speed is reached and I drop the RPMs the air flow resumes back to normal.

Any ideas? Thanks!
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Old 06-08-2010, 01:13 PM
FireRanger FireRanger is offline
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Default Re: A/C Question

You have a vacuum leak somewhere. The air isn't stopping, it is switching to the defrost only vents. The doors that control where the air goes is vacuum operated with a spring that defaults to defrost. Loss of vaccum results in spring moving the door to defrost default.

It is normal for vacuum to decrease on accelleration. But if it is going away completely, you have a leak.
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Old 06-08-2010, 05:04 PM
Bryson Bryson is offline
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Default Re: A/C Question

Ok, thanks! Do you know if this an easy fix?
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Old 06-08-2010, 06:26 PM
Vrod21 Vrod21 is offline
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Default Re: A/C Question

fix = easy
finding the leak = hard
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Old 06-08-2010, 06:45 PM
bordum128 bordum128 is offline
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Default Re: A/C Question

I have had my truck in the shop for 2 straight days looking for my vacume leak. I have my Check Engine Light on with the error code P0171 and P0174 "System too lean". Still cant find it. Good luck buddy!
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Old 06-08-2010, 07:32 PM
FireRanger FireRanger is offline
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Default Re: A/C Question

The leak is (I'd bet money) behind the intake manifold under the spark plug wires. There are several vac lines back there. They inevitably fail. And when they fail, they inevitably cause P0171 and P0174. And if they fail in a big enough way, they cause your HVAC control to do batty. Spray some ether or starting fluid spray back there. When you hear the engine RPM go up, you hit the leak.
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Old 06-08-2010, 07:45 PM
Vrod21 Vrod21 is offline
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Default Re: A/C Question

Quote:
Originally Posted by bordum128 View Post
I have had my truck in the shop for 2 straight days looking for my vacume leak. I have my Check Engine Light on with the error code P0171 and P0174 "System too lean". Still cant find it. Good luck buddy!
Don't mean to hijack the thread.

Check the PCV line. There are rubber elbows that crack and cause those codes. The cracks are hard to see. You have to take the line off and inspect it. Good luck.
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Old 06-08-2010, 07:55 PM
Johnbaum13 Johnbaum13 is offline
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Default Re: A/C Question

Also check the lines running to the vacuum canister. The black "ball" mounted on the pass fender.
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Old 06-08-2010, 07:56 PM
Johnbaum13 Johnbaum13 is offline
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Default Re: A/C Question

Oh, and what part of Texas did you move to? Just out of curiosity.
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Old 06-08-2010, 08:16 PM
Bryson Bryson is offline
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Default Re: A/C Question

Thanks for your help everyone. I'll check it out and hopefully it'll be obvious in some way.

Sheppard AFB in Wichita Falls.
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Old 06-08-2010, 08:27 PM
Johnbaum13 Johnbaum13 is offline
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Default Re: A/C Question

Ah, welcome to the promised land!
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