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  #1  
Old 05-06-2012, 10:28 PM
Ford Tough
 
Join Date: May 2012
Posts: 336
Default 01 - AC issue - blows out of defroster

I have a 2001 Ford Ranger XLT regular cab 2.5L 4 cylinder, manual transmission, RWD. 157k miles.

If I put the AC on (max AC or whatever it says all the way to the bottom left of the dial), it works fine and blows cold. A few minutes later, it stops blowing out of the vents and blows out of the defroster. Then it keeps repeating this cycle every few minutes.

Had a place do a quick vacuum test or something and they said it was likely fine. They mentioned a few things, but it sounded like it would be a costly fishing expedition. I figure when the AC blows out of the vents like it should, it works great, so I can deal with intermittent spurts of it blowing out of the defroster if it's going to cost big $$$. I still want to get it fixed on the first try though, and preferably for cheap.

Never any heat issues.

Thanks!

PS. how much HP is this truck?

Last edited by computersoc; 05-06-2012 at 10:49 PM.
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  #2  
Old 05-07-2012, 05:01 AM
Ford Tough
 
Join Date: May 2009
Posts: 464
Default Re: 01 - AC issue - blows out of defroster

Vacuum leak

Usually the line that runs from the engine to under the air box. The reservoir is under the inner fender above the plastic liner.

Looks kinda like this.



One line goes to the engine the other to the heater controls.
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  #3  
Old 05-07-2012, 06:01 AM
Sweeto Burrito!!!
 
Join Date: Jan 2012
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Default Re: 01 - AC issue - blows out of defroster

^x2. the A/C issue is identical to the one i had a long time ago. was indeed a vacuum leak.
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  #4  
Old 05-07-2012, 01:00 PM
Ford Tough
 
Join Date: May 2012
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Default Re: 01 - AC issue - blows out of defroster

I don't know where in relation to the engine that is. What should I tell the mechanic to fix, or is this a simple DIY? What parts do I need to buy? Thanks!
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  #5  
Old 05-08-2012, 07:21 AM
Sweeto Burrito!!!
 
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Default Re: 01 - AC issue - blows out of defroster

it looks like that pic is turned sideways. if u tilt your head 90 degrees to the right...looks like it's in the rear-passenger side under the hood. i don't know what the part is called, but my problem was a vacuum hose - fixed under warranty. sorry i can't help more

free bump!
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  #6  
Old 05-08-2012, 10:21 AM
Ford Motor Company
 
Join Date: Aug 2011
Posts: 148
Default Re: 01 - AC issue - blows out of defroster

Its called a vacuum reservoir tank and like was already said one line to the engine the source line, one to to the heater controls the supply line. The tank has a check valve to make sure when engine vacuum drops, as when accelerating, the supply line does not. A leak in the lines, the tank or a bad check valve can make the modes change as they lose vacuum and return to their “at rest” position. The vacuum stays low till it is restored by the engine when engine vacuum rises. The source restored ,the tank and system are returned to normal . The modes now change back to the previous selected position. That being said odds are you have a leak somewhere could also be a bad tank. your going to have to check it out.
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  #7  
Old 05-08-2012, 05:45 PM
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Join Date: May 2012
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Default Re: 01 - AC issue - blows out of defroster

What should I tell the mechanic?

What about parts and labor, will this be a lot of money? Rough estimates?

Most places around here charge 90 hr labor (yet a 30 minute oil change is $15, go figure).
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  #8  
Old 05-08-2012, 07:27 PM
Ford Motor Company
 
Join Date: Aug 2011
Posts: 148
Default Re: 01 - AC issue - blows out of defroster

You can only tell him the symptoms you have you can’t tell him what it is because you don’t know. There is no way to estimate the repair cost. FIRST they need to find out what the problem is. How hard was it to find and get to, what did it need to repair it a hose for 5$ or vacuum tank for 50$. I guess I would try to get an estimate or at least set a limit like you don’t want to spend more than 150$. Take it in and talk to them and see what they say. You can always take it leave with it not repaired. If your lucky if may be a very common problem and they will have an idea what it may be. Sorry that’s the best I can tell you.. Good Luck
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  #9  
Old 06-05-2012, 02:56 PM
Learning to use the forums
 
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Smile Re: 01 - AC issue - blows out of defroster

Hi, I have a 2000 Ranger XLT 4x4 with the 4.0L engine. The vacuum ball is in the engine compartment up front near the radiator on the passenger side. It has two lines plugged into the ball. One of my lines had flipped close to the exhaust manifold and melted about an inch long half moon shape in to it. I tested it with my finger plugging the hole and all functions returned to the climate controls. I went to AutoZone and spent about $8 on a vacuum hose connector and some shrink tubing. Slid the connector about 3 inches into the 6 inch tubing then over the damaged section which I had pulled from the ball and removed the end connector. Used a propane lighter to shrink the shrink tubing and hooked back up Everything works great. $8! Sweet. Thanks to the Forum for giving me a clue where to start!
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  #10  
Old 06-05-2012, 06:10 PM
Sweeto Burrito!!!
 
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Default Re: 01 - AC issue - blows out of defroster

^sweet! glad it worked out for you!
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  #11  
Old 06-23-2012, 09:24 PM
Ford Tough
 
Join Date: May 2012
Posts: 336
Default Re: 01 - AC issue - blows out of defroster

I haven't had a chance to go to the shop yet. I can give more input now because I figured out how to mitigate this issue when it occurs.

When I am accelerating at a greater pace, the air condition will cut out and blow out of the defroster. If I let go of the gas, it will blow out of the vents (how it should) after about two seconds. Rinse and repeat. If I baby the throttle then it doesn't happen as much, but again, if it does happen, I take my foot off the peddle and two seconds later all is well.
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  #12  
Old 06-23-2012, 09:59 PM
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Default Re: 01 - AC issue - blows out of defroster

Manifold vacuum goes down as throttle position goes up. If you have a leak, or the check-valve on the HVAC vacuum reservoir is broken, the reduction in vacuum at high throttle will cause the HVAC to dump to defrost.
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  #13  
Old 06-23-2012, 11:16 PM
Ford Tough
 
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Default Re: 01 - AC issue - blows out of defroster

What are the exact words I should tell the shop so it sounds like I know what I'm talking about?

I'll stop by on my next oil change, which should be soon.
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  #14  
Old 06-23-2012, 11:44 PM
Learning to use the forums
 
Join Date: Jun 2012
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Default Re: 01 - AC issue - blows out of defroster

Tell him you have a vacuum leak on your HVAC system, if your lucky it's under the hood, if your not it's in the dash. In my experience any Ford vehicle with Air conditioning uses vacuum to change the vents, anytime there is a leak or ina diesel the electric vacuum pump quits they always default to the defroster.
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  #15  
Old 06-25-2012, 05:46 PM
Learning to use the forums
 
Join Date: Jun 2012
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Default

There is a small red vacuum line over top of yhe alternator. Its inside some wireloom. Pull it out and trace it down i will bet thats the prob. I just fixed mine doing the same thing.
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